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FCC Radio Frequency Service Interference Complaint Portal - PSIX-ESIX
To submit radio interference complaints on behalf of public safety entities, first responders, police, fire, law enforcement or a federal agency, click the Public Safety link below. To submit radio interference complaints on behalf of a commercial or federal entity, click the Enterprise link below. For consumer complaints involving TV, phone, internet, radio, or emergency communications, click the Consumer link below.
FCC  public-safety  Interference  EB  enforcement  Enforcement-Bureau 
14 days ago by pierredv
GNSS Threat Monitoring and Reporting: Past, Present, and a Proposed Future | RNTF Aug 2019
The authors of this excellent paper, which was named the Journal of Navigation’s best paper for 2018, propose a technical architecture to enable collection and use of diverse GNSS threat monitoring sources.
RNTF  GPS  GNSS  Interference  measurement 
9 weeks ago by pierredv
GNSS Threat Monitoring and Reporting: Past, Present, and a Proposed Future | The Journal of Navigation | Cambridge Core
Via RNTF blog, Aug 2019


Vulnerability of satellite-based navigation signals to intentional and unintentional interference calls for a high-level overview of Global Navigation Satellite System (GNSS) threats occurring globally to understand the magnitude and evolution of the problem. Therefore, a mechanism needs to be developed whereby disparate monitoring systems will be capable of contributing to a common entity of basic information about the threat scenarios they experience. This paper begins with a literature survey of 37 state-of-the-art GNSS threat monitoring systems, which have been analysed based on their respective operational features - constellations monitored and whether they possess the capability to perform interference-type classification, spoofing detection, and interference localisation. Also described is a comparative analysis of four GNSS threat reporting formats in use today. Based on these studies, the paper describes the Horizon2020 Standardisation of GNSS Threat Reporting and Receiver Testing through International Knowledge Exchange, Experimentation and Exploitation (STRIKE3) proposed integrated threat monitoring demonstration system and related standardised threat reporting message, to enable a high-level overview of the prevailing international GNSS threat scenarios and its evolution over time.
GNSS  GPS  Interference  measurement 
9 weeks ago by pierredv
Cellphones a Flight Danger? Could Be on Some Boeing Jets - Bloomberg Jul 2019
Via Blake Reid

"U.S. government officials in 2014 revealed an alarming safety issue: Passenger cellphones and other types of radio signals could pose a crash threat to some models of Boeing 737 and 777 airplanes.

More than 1,300 jets registered in the U.S. were equipped with cockpit screens vulnerable to interference from Wi-Fi, mobile phones and even outside frequencies such as weather radar, according to the Federal Aviation Administration, which gave airlines until November 2019 to replace the units made by Honeywell International Inc.

Today, potentially hundreds of planes worldwide are still flying with the unsafe systems cited in the FAA report. "

Towards end of article, litany of unexplained problems to ASRS
Bloomberg  Boeing  spectrum-vulnerability  Interference  ASRS 
july 2019 by pierredv
Global Positioning System(GPS) Adjacent Band Compatibility Assessment | US Department of Transportation
DOT GPS Adjacent Band Compatibility Assessment: Final Report

DOT GPS Adjacent Band Compatibility Assessment: Final Report (Appendices A-F)

DOT GPS Adjacent Band Compatibility Assessment: Final Report (Appendices G-K)
DoT  GPS  interference 
june 2019 by pierredv
Cliff Mass Weather and Climate Blog: Will 5G Undermine Weather Prediction?
potential harm to U.S. and worldwide numerical weather prediction by interfering with the 23.8 GHz band is certainly real, but difficult to quantify
Cliff-Mass  5G  interference  NOAA  MetSat  EarthObservation  EO 
may 2019 by pierredv
Drone flights over Iraq limited by electromagnetic interference - May 2019
"Electromagnetic interference is now a durable part of the modern battlefield, and one that is degrading the ability of American and allied forces to operate at full capacity as they once had. The news comes from the latest report by the Inspector General for Operation Inherent Resolve, published May 7.

“Due to maintenance issues, disabled video broadcasting devices, and electromagnetic interference, about 11 percent of Coalition ISR coverage this quarter was lost, specifically affecting areas along the Iraq-Syria border and in northern Iraq,” the report read, citing a statement from Coalition Joint Task Force - Operation Inherent Resolve."
warfare  Interference 
may 2019 by pierredv
A Mystery Frequency Disrupted Car Fobs in an Ohio City, and Now Residents Know Why - The New York Times May 2019
Via Dale

"Starting a few weeks ago, in a suburban neighborhood a few miles from a NASA research center in Ohio, garage door openers and car key fobs mysteriously stopped working."

" The source of the problem was a homemade battery-operated device designed by a local resident to alert him if someone was upstairs when he was working in his basement. It did so by turning off a light."
NYTimes  spectrum-vulnerability  Interference 
may 2019 by pierredv
Global 5G wireless networks threaten weather forecasts - Nature, Apr 2019
The US government has begun auctioning off blocks of wireless radio frequencies to be used for the next-generation mobile communications network known as 5G. But some of these frequencies lie close to those that satellites use for crucial Earth observations — and meteorologists are worried that 5G transmissions from cellphones and other equipment could interfere with their data collection.
5G  NatureJournal  Interference  meteorology  NASA  NOAA 
may 2019 by pierredv
Mystery of Blocked Key Fobs at Parking Lot 'Likely' Solved, Canadian Ministry Says
In a Facebook post on Friday, Westview characterized the fob-blocking culprit as “faulty consumer electronic equipment stuck in transmit mode in the are.” The co-op added, “We want to communicate that this was NOT the result of any intentional criminal activity, or any other activity that was speculated.”
Gizmodo  interference  security  cyber-spectrum  cybersecurity  spectrum-vulnerability  automobile  hacks 
february 2019 by pierredv
Europe hoping to overcome C-band satellite interference | PolicyTracker, Jan 2019
There has been a clear push by national regulators across Europe to release 3.5 GHz spectrum. However, mobile deployments in the region’s primary capacity band for 5G could be at risk due to potential satellite interference from neighbouring countries and military services.
C-band  3.6GHz  5G  Interference  PolicyTracker  Finland  Netherlands  satellite  military 
january 2019 by pierredv
Costs and consequences of wind turbine wake effects arising from uncoordinated wind energy development | Nature Energy, Nov 2018
Via Nature podcast
"Optimal wind farm locations require a strong and reliable wind resource and access to transmission lines. As onshore and offshore wind energy grows, preferred locations become saturated with numerous wind farms. An upwind wind farm generates ‘wake effects’ (decreases in downwind wind speeds) that undermine a downwind wind farm’s power generation and revenues. Here we use a diverse set of analysis tools from the atmospheric science, economic and legal communities to assess costs and consequences of these wake effects, focusing on a West Texas case study. We show that although wake effects vary with atmospheric conditions, they are discernible in monthly power production. In stably stratified atmospheric conditions, wakes can extend 50+ km downwind, resulting in economic losses of several million dollars over six years for our case study. However, our investigation of the legal literature shows no legal guidance for protecting existing wind farms from such significant impacts."
NatureJournal  wind  energy  economics  interference 
december 2018 by pierredv
Response to 5 July 2017 PNT Advisory Board Letter on Ligado Spectrum Proposal
"I was more than puzzled by the July 5, 2017 letter from the PNT Advisory Board (“PNT AB”) about Ligado’s spectrum proposal."
Dennis-Roberson  GPS  Ligado  Interference  harmful-interference 
december 2018 by pierredv
South Florida’s Hurricane Building Code is Strong—And North Florida’s Could Be Stronger by Bob Henson | Category 6 | Weather Underground
"Figure 1 (below) shows the 3-second wind gusts used in Florida since 2010 to set the minimum building code that applies to most homes and other structures apart from hospitals and other health care facilities. These values were calculated based on extensive computer modeling and observations, drawing in part on the state’s multiple hurricane landfalls in 2004. They’re designed to represent the highest gusts one would expect to recur at a given point in a typical 700-year period."

Can apply to spectrum statistics: uses combination of "extensive computer modeling and observation"

From Sun Sentinel quote: '' Insurance Journal added: “The shift toward less rigorous codes is driven by several factors, experts say: Rising anti-regulatory sentiment among state officials, and the desire to avoid anything that might hurt home sales and the tax revenue that goes with them. And fierce lobbying from home builders.” ''
Wunderground  risk-assessment  weather  building-codes  interference  statistics 
october 2018 by pierredv
Industry Leaders Address Public-Safety 800 MHz Interference Issues - Nov 2017
"Even as 800 MHz rebanding finally winds down, 800 MHz interference issues continue to plague public-safety communications officials. New cellular carrier rules in the band will likely affect public-safety networks nationwide."
800MHz  interference  public-safety 
august 2018 by pierredv
5G Update: Standards Emerge, Accelerating 5G Deployment | 2018-05-15 | Microwave Journal
"With such closely packed bands and extremely wideband radios, the performance degradation from receiver desensitization is likely with inadequate filtering, PA linearity and harmonic suppression. New NSA 5G NR transmitters can operate with higher output power and higher peak-to-average power ratios for maximum throughput, which may cause problems with co-located 5G receivers in the same base station or nearby 5G devices."
MicrowaveJournal  5G  EMC  coexistence  RF  interference 
june 2018 by pierredv
Estimating the Likelihood of Wireless Coexistence Using Logistic Regression: Emphasis on Medical Devices - IEEE Journals & Magazine
Mohamad Omar Al Kalaa ; Seth J. Seidman ; Hazem H. Refai
Medical device manufacturers incorporate wireless technology in their designs to offer convenience and agility to both patients and caregivers. However, the use of unlicensed radio spectrum bands by both medical devices and other equipment raises concerns about wireless coexistence. Work by the accredited standards committee C63 of the American National Standards Institute (ANSI) to provide the community with a consensus standard for coexistence evaluation resulted in the publication of the ANSI C63.27 standard, which was later recognized by the U.S. Food and Drug Administration. Estimating the likelihood of wireless coexistence of a system under test (SUT) in a given environment is central to the evaluation and reporting of wireless coexistence, as made clear in the C63.27 standard. However, no method to perform this estimation is provided. In this paper, we propose the use of logistic regression (LR) to estimate the likelihood of wireless coexistence of a medical device in its intended environment. Radiated open environment coexistence testing was used to realize a test scenario in which the interfering network was IEEE 802.11n Wi-Fi and the SUT was ZigBee; exemplary wireless technologies for interfering network and medical device, respectively. LR model fitting was then performed to derive a model that describes the performance of SUT under a range of wireless coexistence phenomena. Finally, results were incorporated with the outcome of a spectrum survey using Monte Carlo simulation to estimate the SUT likelihood of wireless coexistence in a hospital environment.
Wireless  coexistence  Interference  probability  risk-assessment  medicine  devices 
june 2018 by pierredv
New generation of non-geostationary constellations poses challenges for WRC-19 | PolicyTracker: the spectrum management newsletter
"Article 22.2 of the Radio Regulations, the ITU document that manages international spectrum use, states that geostationary orbit (GSO) satellites cannot receive interference from NGSO satellites in fixed-satellite service (FSS) bands. However, the regulations do not yet include any rules on how this is to be achieved above 30 GHz.

To address this, agenda item 1.6 of WRC-19 considers the regulatory framework for NGSO satellites to use the fixed-satellite service at 37.5–39.5 GHz (space-to-Earth), 47.2–50.2 GHz (Earth-to-space) and 50.4–51.4 GHz (Earth-to-space).

In addition to preventing interference to GSO satellites, the rules also need to find a way for NGSO satellites to avoid interference to each other, to passive earth exploration satellite services at 36-37 GHz and 50.2-50.4 GHz and to radio astronomy services at 42.5-43.5 GHz, 48.94-49.04 GHz and 51.4-54.25 GHz."

"... WP 4A had identified a way to calculate unavailability: the convolution methodology. This is meant to protect GSO satellites without imposing onerous and spectrally inefficient equivalent power flux-density (EPFD) limits on NGSO systems.

It works by calculating the single entry increase in unavailability to a reference GSO link, compared to a maximum stipulated in the Radio Regulations. Administrations then determine the overall increase in link unavailability so that aggregate interference will not degrade the GSO satellites’ availability by more than 10 per cent."

US IWG-3: "Alexander Epshteyn, an engineer at Boeing, drafted a paper for the group’s meeting in late March that proposed solutions to protect GSO networks based on the convolution methodology."
PolicyTracker  NGSO  ITU-R  WRC-19  GSO  EPFD  FSS  interference  *  Boeing 
may 2018 by pierredv
LTE and Bluetooth in-device coexistence with WLAN
Modern mobile phones can support cellular and non-cellular wireless communications standards at the same time. This means, however, that the subsystems must operate in very close proximity to each other within a single device (in-device coexistence). The resulting high level of reciprocal leakage can at time cause considerable interference.

Download the app note to learn more!
Rohde&Schwatz  LTE  Bluetooth  Wi-Fi  WLAN  coexistence  interference 
may 2018 by pierredv
The role of unwanted emissions and receiver performance in spectrum management - ECC Newsletter May 2018
"When the '800 MHz' band — from 790-862 MHz — was studied for mobile (4G) usage, compatibility studies (see CEPT Report 30) showed that both unwanted emissions from mobile systems and selectivity of the digital terrestrial television (DTT) receiver could have an impact on DTT reception. However, the studies also found that reducing further unwanted emissions of 4G base stations beyond a certain level would not provide additional mitigation because receiver selectivity would then be the dominant interference effect."

"The boundary between the out-of-band and spurious emission domains is usually defined as 2.5 times the transmitter’s bandwidth, but there are some exceptions to this rule. "

"Particular challenges in this ongoing review are raised for 5G technology using active antenna systems (AAS). In this case, the antenna array is integrated in the device, which means that unwanted emissions cannot be as easily measured. It has also been reported that it will be difficult for 5G systems in millimetre wave bands (26 GHz and above) to meet the existing limits, due to constraints on filtering technology."

"In ECC Report 249, published in 2016, measurements of a range of different types of transmitters showed that typical equipment generally exceeds – by some margin— the minimum requirements for both out-of-band and spurious emissions. Therefore, assessing interference based on the minimum requirement represents a worst-case scenario which may limit opportunities for sharing. The report concluded that sharing and compatibility studies should reflect actual equipment performance in order to ensure efficient use of spectrum. Ideally a statistical distribution of unwanted emissions should be used in the studies to capture the spread in performance of different equipment models."
ECC  interference  receivers  OOBE  antennas  5G  ABI  Wi-Fi 
may 2018 by pierredv
FCC Proposes Rules to Streamline FM Translator Interference Complaints | May 2018
via Dale hatfield; his commentary:

Based upon my very quick read it:

1. Appears to have been written by the media bureau with out any help from OET (or even EB)
2. Does not address the statistics of propagation – i.e., uncertainties in the calculation of coverage contours
3. Shows little appreciation of the important role of receivers when dealing with adjacent channels
4. Relatedly, does not indicate any knowledge of RIIA
5. The above was probably exacerbated by the fact that there is no indication that more sophisticated techniques were proposed after the original petition
FCC  FM  interference 
may 2018 by pierredv
Drone interference disrupts UAV event at Xian City Wall - May 2018
"Fascinating story from the Beijing News about an event using UAVs that went awry at Xian City wall this May. The article is in Chinese - you'll need to translate it using google or similar - but it appears the event was using over 1000 drones, some of which experienced directional RF interference which caused some of the drones to stop working

Link to the article is here:

Also a video of the event can be found here:-"
drones  UAS  Interference 
may 2018 by pierredv
Eutelsat Adopts Anti-Jamming Tech In Upcoming Satellite - Feb 2013
“This function involves embarking new-generation frequency converters behind the satellites Receive antennas,” reads Eutelsat’s press release. “This will put Eutelsat in the unique position to be able to change the frequency of an uplink signal without any impact on the downlink frequency received by user terminals, marking a major breakthrough in the bid for continuity of service for broadcast signals jammed by rogue uplink signals.”
satellite  interference  jamming  broadcasting 
may 2018 by pierredv
47 CFR 25.261 - Sharing among NGSO FSS space stations. | US Law | LII / Legal Information Institute
Absent coordination between two or more satellite systems, whenever the increase in system noise temperature of an earth station receiver, or a space station receiver for a satellite with on-board processing, of either system, ΔT/T, exceeds 6 percent due to interference from emissions originating in the other system in a commonly authorized frequency band, such frequency band will be divided among the affected satellite networks in accordance with the following procedure
FCC  satellite  interference  coordination  NGSO  regulations 
april 2018 by pierredv
How We Reverse Engineered the Cuban “Sonic Weapon” Attack - IEEE Spectrum
"Ultrasonic emitters can produce audible by-products that could have unintentionally harmed diplomats. That is, bad engineering may be a more likely culprit than a sonic weapon."

"Online, we found a manufacturer in Russia that sells a fashionable leather clutch that conceals an ultrasonic emitter, presumably to jam recording devices at cocktail parties. We also found electronics stores that carry high-⁠power ultrasonic jammers that cause microphones to malfunction. One advertised jammer emits 120-dB ultrasonic interference at a distance of 1 meter. "
acoustics  interference  intermodulation  IEEE-Spectrum  ultrasound  jamming  Cuba 
april 2018 by pierredv
Satellite geolocation - Wikipedia
Satellite geolocation is the process of locating the origin of a signal appearing on a satellite communication channel. Typically, this process is used to mitigate interference on communication satellites. Usually, these interference signals are caused by human error or equipment failure, but can also be caused by deliberate jamming. Identifying the geographical location of an interfering signal informs the mitigation activity.
Wikipedia  geolocation  satellite  interference  TDOA  FDOA 
april 2018 by pierredv
RF Interference Mitigation | Kratos Technology & Training Solutions
"Kratos has the most comprehensive RF interference (RFI) mitigation products on the market to support day-to-day operations for satellite operators and bandwidth resellers so they can provide the best quality of service possible.

Kratos industry-leading carrier monitoring product family includes Monics®Net, Monics®Enterprise for advanced enterprise level carrier monitoring, the most accurate geo-location product, satID®, SigX™, which automatically cancels CW and sweeping CW interference and SatGuard to combat VSAT interference."
satellite  interference  RFI  mitigation 
april 2018 by pierredv
Many U.S. wireless devices not allowed in Germany | Article | The United States Army
"Most American baby monitors run on the 900MHz frequency- which is what emergency groups (ambulance, police, and firemen) use in Germany."

"These same baby monitors are also responsible for creating interferences with Vodafone Germany GmbH (mobile communications provider in Germany) signals, as they fall into Vodafone's assigned communications bandwidth."

"In past incidents, the Bundesnetzagentur has discovered and fined U.S. Army base housing units in Germany, where baby monitors were found to be interfering with German emergency frequencies."
Interference  900MHz  Germany  BNA 
april 2018 by pierredv
On the impact of inter-UAV communications interference in the 2.4 GHz band - IEEE Conference Publication
As the use of Unmanned Aerial Vehicles (UAVs) increases, protocols to avoid collisions between them, and to achieve collaboration through swarm-based configurations, are receiving more attention by the research community. In this work we study the performance of communication links between drones in the 2.4 GHz wireless band, where a high interference from the radio control unit is expected. We performed a large set of experimental tests, and the results demonstrate that the use of the WiFi 2.4 GHz band for any application is not compatible with overwhelming majority of remote controls working in the same frequency band. Moreover, the distance between drones, the data packet size, and the engines speed are also factors affecting the communications link quality.
IEEE  UAS  UAV  drones  interference  unlicensed  2.4GHz 
april 2018 by pierredv
LTE in the sky: trading off propagation benefits with interference costs for aerial nodes - IEEE Comm Mag, May 2016
The popularity of unmanned aerial vehicles has exploded over the last few years, urgently demanding solutions to transfer large amounts of data from the UAV to the ground. Conversely, a control channel to the UAV is desired, in order to safely operate these vehicles remotely. This article analyzes the use of LTE for realizing this downlink data and uplink control. By means of measurements and simulations, we study the impact of interference and path loss when transmitting data to and from the UAV. Two scenarios are considered in which UAVs act as either base stations transmitting in downlink or UEs transmitting in uplink, and their impact on the respective downlink and uplink performance of an LTE ground network is analyzed. Both measurements and simulations are used to quantify such impact for a range of scenarios with varying altitude, distance from the base station, or UAV density. The measurement sets show that signal-to-interference ratio decreases up to 7 dB for UAVs at 150 m compared to ground users. Simulation results show that a UAV density of 10/km2 gives an average degradation of the signal-to-interference ratio of more than 6 dB. It is concluded that interference is going to be a major limiting factor when LTE enabled UAVs are introduced, and that strong technical solutions will have to be found.
IEEE-CommMag  IEEE  LTE  UAS  drones  interference  UAV 
april 2018 by pierredv
[pdf] EPFD Verification Software Status and Perspective - slides 2016
Transfinite, Agenium, IRU-R
from ITU Workshop on the Non-GSO Satellite Issues, 21st April 2016
ITU-R  Transfinite  Agenium  satellite  epfd  interference  NGSO 
april 2018 by pierredv
Equivalent power-flux density limits validation in accordance with Resolution 85 (WRC-03)
Resolution 85 (WRC-03) requires the Bureau to verify compliance of frequency assignments of non-geostationary fixed satellite service  systems with the single-entry equivalent-power flux density (EPFD) limits in Tables 22-1A, 22-1B, 22-1C, 22-1D, 22-1E, 22 2 and 22-3 of Article 22 of the Radio Regulations and to determine the coordination requirements under Nos. 9.7A and 9.7B.

In order to perform this regulatory examination, the Bureau in collaboration with two software companies developed a validation software package to calculate EPFD levels produced by non-GSO satellite systems.
epfd  calculation  software  satellite  interference  NGSO 
april 2018 by pierredv
[15]  Limits on equivalent power-flux density (EPFD)
Document : ITU-R WRS16 Contribution 15
Title : Limits on equivalent power-flux density (EPFD)
Date :2016-11-01
Source :Space Services Department
ITU-R  epfd  satellite  interference 
april 2018 by pierredv
[pdf] ECC Report 249 - Unwanted emissions of common radio systems: measurements and use in sharing/compatibility studies - Apr 2016
"The scope of this report is:

 To compare the measured characteristics of a limited number of equipment samples with the existing regulatory limits in order:

 To explore the current definitions of the limits used for the OoB and spurious domains given in ITU-R Recommendations and ETSI standards

 To compare the "safety-net" worst case characteristics of OoB emissions in Rec. ITU-R SM.1541 [1] and the measurements of the equipment samples

 To compare spurious domains emissions in ERC/REC 74-01 [2] Rec. ITU-R SM.329 Category B and the measurements of the equipment samples

 To characterise the unwanted emissions of various digital modulation technologies of broadband communication systems. It considers the boundary between the out-of-band (OoB) and spurious domains as well as the levels of unwanted emissions in a set of measurements on equipment samples.

 To develop possible concepts to better characterise the unwanted emissions of broadband systems using digital technology to enable a more efficient use of the radio spectrum in adjacent bands."

"It is observed that the measured emissions are typically lower than the limits in
recommendations and ETSI standards by a significant margin of several tens of dBs in the spurious domain,
except for the harmonic frequencies. This finding has an important implication for sharing and compatibility
studies which are typically based on the assumption that equipment would only just meet the limits set out in
standards. "

"Two questions are raised:

1 Should sharing/compatibility studies be based on typical performance of unwanted emissions rather than the limits?

2 Should those limits/levels in bands adjacent to the operating one (and boundary between the OoB and spurious domains) be redefined or be re-considered on a case-by-case basis to better reflect actual performance of equipment, and therefore allow for increased opportunities for sharing/compatibility and more efficient use of spectrum in future?"

"Regarding the out-of-band domain limits, the measurements have shown that the limits specified in ETSI standards are generally the relevant limits particularly tailored to the specific application; ITU-R SM.1541 [1] (containing only the "safety-net" limits which are mainly only based on services) consequently shows a large margin as expected."
ECC  CEPT  reports  spectrum-sharing  interference  *  resources  OOBE  spurious-emissions  LTE  DAB  GSM 
march 2018 by pierredv
[pdf] Turksat 2013 = Fighting with satellite interference
Useful inventory of modes:

= cross polarization

= human error ("Uplink personnel may enter incorrect parameters such as center frequency or symbol rate resulting in interference to other carriers")

= equipment error ("such as malfunctioning of Uplink Power Control systems could
cause the carrier to increase its power level dramatically impacting other carriers")

= adjacent satellite - antenna alignment error ("Uplink systems trying to uplink to a close by satellite may cause interference if the antenna is not aligned correctly to the intended satellite")
satellite  interference  risk-assessment  * 
february 2018 by pierredv
International Satellite communication workshop: "The ITU - challenges in the 21st century: Preventing harmful interference to satellite systems" 2013
Good set of slides

"In response to increasing demand for satellite communications – and reflective of international cooperation to facilitate expanded access to satellite connectivity – harmful interference prevention regulations and measures are being discussed, developed and implemented worldwide. Building upon dialogue between the ITU and the international ICT community during WRC-12, which has been ongoing since, the Bureau is pleased to announce the holding of a one-day workshop in Geneva on 10 June 2013.

"The Geneva workshop will be an open event where participation of national administrations, the satellite communications industry, user community, other ICT stakeholders, as well as all those with an interest in the topic, is strongly encouraged.

"The workshop will provide ITU stakeholders with an opportunity:

= to learn about harmful interference situations affecting satellite systems,
= to review the ongoing regulatory and technical initiatives and strategies for solving the issue, and
= to share reports on practices and the impact those measures are having on ICT operational effectiveness and service."
workshop  satellite  Interference  ITU  ITU-R  * 
february 2018 by pierredv
Interference and Compatibility Studies Between Satellite Service Systems and Sys
This paper provides the results of interference and compatibility studies in order to assess the sharing conditions between Fixed Satellite Service (FSS) and Fixed Service provided by High Altitude Platform Stations (HAPS) in the same operational frequency bands and discusses the most important operational parameters that have an impact on the interference calculations. To characterize interference phenomena between the two systems carrier to interference (C/I) ratios are evaluated. Simulation results under the scenario of a realistic deployment of HAPS and the use of different satellite configurations are presented. An interesting result derived from the simulations is that FSS/GSO Earth Stations and HAPS ground stations may coexist in the HAPS coverage area under certain considerations.
coexistence  interference  HAPS  GSO  FSS  satellite 
february 2018 by pierredv
Satellite IRG | Satellite Interference Reduction Group
The Satellite Interference Reduction Group (IRG) is the global industry organisation, whose mission is to combat and mitigate radio frequency interference (RFI) for an interference-free Satellite Frequency Spectrum.

There are a number of tools, technologies, and processes already available to reduce interference and our goal is two-fold: firstly we are working to help the industry understand what those are and how to use them effectively; and secondly we are constantly looking for new and better ways to fight satellite interference.
satellite  interference  SatIRG 
february 2018 by pierredv
SiriusXM-AT&T Want Approval for Interference Fix. | Story | - Feb 2017
It has been a decade since SiriusXM Radio first raised the issue of AT&T cellphones causing interference to its network of land-based repeaters. In a letter to the Federal Communications Commission, SiriusXM VP James Blitz says the two companies have devoted “significant resources” toward a “joint coordination effort” to resolve the interference issues. They’ve included what Blitz describes as “extensive and frequent communication at multiple levels of each company” as well as “thousands of hours” of equipment testing. It seems to be paying off.
FCC  SiriusXM  AT&T  SDARS  WCS  interference 
february 2018 by pierredv
European satellite 'blinded' by radio interference - Oct 2010
The European Space Agency (ESA) said on Wednesday that it had launched a behind-the-scenes campaign to shut down illicit radio and TV transmissions interfering with a major climate satellite.
The 315-million-euro (434-million-dollar) Soil Moisture and Ocean Salinity (SMOS) probe "has been bugged by patches of interference from radar, TV and radio transmissions in what should be a protected band," ESA complained.
satellite  harmful-interference  Interference  EarthObservation  ESA  enforcement 
february 2018 by pierredv
Official Observer - ARRL
Official Observer appointees have assisted thousands of Amateur Radio operators to maintain their transmitting equipment and comply with operating procedures and regulations. The object of the OO program is to notify amateurs of operating and technical irregularities before they come to the attention of the FCC and to recognize good operating practices.

The OO program serves as the first line of "eyes and ears" for the FCC. It is the backbone of the Amateur Auxiliary. OOs are certified in the Auxiliary by passing a mandatory written examination.
ARRL  interference  FCC  EB  Enforcement-Bureau 
january 2018 by pierredv
FCC Orders Lumenier To Pay FCC $180k For Non-compliant Transmitters -, Dec 2017
"In an Order released on December 19, the FCC explained that Lumenier Holdco LLC (formerly known as FPV Manuals LLC) was advertising and marketing uncertified AV transmitters capable of operating on both amateur and non-amateur frequencies, including bands reserved for federal government use. Some of the transmitters also exceeded the 1-W power limit for Amateur Radio transmitters used on model craft, the FCC said"
FCC  EB  Enforcement-Bureau  drones  interference  ARRL 
january 2018 by pierredv
Sorry sci-fi fans, real wars in space not the stuff of Hollywood - Jan 2017
"Savvy space warriors like Russia’s military already are giving us a taste of the future. They are jamming GPS navigation signals, electronically disrupting satellite communications links and sensors in space. Not quite star wars.
This form of electronic warfare in space is serious enough, however, that the U.S. military is now moving to defend its satellites and other space assets. There is in fact a real conversation under way about war in space, albeit one of cyber and electromagnetic attacks, not spaceships shooting at each other."

"As the Pentagon maps out strategies and tactics to defend its satellites, military lawyers are actively investigating how international law applies to outer space. ... As with other uses of military force, actions in space are restricted by international rules."
SpaceNews  jammin  interference  space  cyberwar  warfare  law 
january 2018 by pierredv
SKA, aviation clash over radio frequency interference | ITWeb Jun 2016
"There is an impasse between the Square Kilometre Array (SKA) SA and the local aviation industry over the restriction of some radio frequencies within the Karoo.

A draft Astronomy Geographic Advantage (AGA) Act has been published for public comment, seeking the protection of the SKA from radio interference. The frequency spectrum that is referred to in the AGA is from 100MHz to 25.5GHz."

"The Civil Aviation Authority (CAA) says a restriction on the frequencies would hamper two-way communication between pilots and the relevant air traffic control sector. However, the SKA says these draft regulations specifically recognise the importance of safety-of-life services, such as those used in the aviation sector, and provide for exemptions of these services from the strictest of the SKA protection requirements."
CAA  SKA  interference  spectrum  ATC  air-traffic-control 
december 2017 by pierredv
Radio frequency ban at SKA may see aircraft rerouted - BusinessDay Jun 2016
"A POSSIBLE ban of certain radio frequencies in the Karoo as a result of the Square Kilometre Array (SKA) project could see aircraft flying the Johannesburg-Cape Town route being redirected via Port Elizabeth, the Atlantic Ocean or over Upington."

"About 131,500ha of land surrounding the telescope’s 176-dish core, which lies 80km from Carnarvon, needs to be free from radio frequency interference. As a result, radio frequencies in the spectrum 100MHz to 25.5Ghz could be banned from a large portion of the Karoo. The ban would also have a negative effect on mandatory search, rescue and alerting services in the area. SA’s aviation authorities are opposed to a possible ban on the frequencies.
The Civil Aviation Authority (CAA) said a ban on the frequencies would hamper two-way communication between pilots and the relevant air traffic control sector."
South-Africa  astronomy  spectrum  interference 
december 2017 by pierredv
47 CFR 2.102 - Assignment of frequencies. | US Law | LII / Legal Information Institute
(f) The stations of a service shall use frequencies so separated from the limits of a band allocated to that service as not to cause harmful interference to allocated services in immediately adjoining frequency bands.
spectrum  harmful-interference  interference  regulations  FCC  47CFR  licensing 
october 2017 by pierredv
Carrier ID - Technology - Newtec
"With satellite interference becoming an increasing problem, Carrier Identification (CID) is an important part of the solution to mitigate carrier interference. CID is a signal embedded into a video or data transmission path. It allows satellite operators and end users to identify the source of an interfering carrier. The transition to CID has started from 1 January 2015"
satellite  interference  enforcement  CarrierID 
september 2017 by pierredv
This paper provides the results of studies in order to assess the sharing conditions between Fixed Satellite Service (FSS) and High Altitude Platform Stations (HAPS) in the same operational frequency bands. To characterize interference phenomena between the two systems carrier to interference (C/I) ratios are evaluated. Simulation results under the scenario of a realistic deployment of HAPS and the use of different satellite configurations are presented. An interesting result derived from the simulations is that FSS/GSO Earth Stations and HAPS ground stations may coexist in the HAPS coverage area under certain considerations. arrive at a satisfactory long term environment. The efficient utilization of the same spectrum is of great importance due to the scarce resources of it. Taking into consideration the fact that the allocation of the fixed-satellite service in the bands 47.2-50.2 GHz for Earth-to-Space transmission is more important than that in the 37.5-39.5 GHz band in order to accommodate feeder links to broadcasting satellites and that the 47/48 GHz band is the unique allocation of HAPS fixed service in Europe, this paper investigates the requirements and criteria of the two systems in order to operate in the same frequency bands in an non-interference basis and discusses as well the most important operational parameters that have an impact on the interference calculations. At first the potential interference caused by HAPS platform directing to the geostationary satellite receiver is examined. To characterize interference phenomena between the two systems carrier to interference (C/I) ratios are evaluated and the interference values are compared with the maximum permissible interference powers for the proper operation of the Fixed Satellite System. The same procedure is followed for the examination of the interference paths from FSS earth stations to HAPS ground stations. The first section introduces a typical HAPS-based FS system in V-band while the second describes the operational technical characteristics of GSO/FSS systems plaaned for the 40/50 GHz band. The last section of this paper gives a detailed description of the potential interference between HAPS and FSS systems and summarizes the results of the interference analysis
FSS  FS  HAPS  interference  V-band  GSO  satellite 
september 2017 by pierredv
USAF Wants Authority To Down Drones After F-22 Near Miss | Defense content from Aviation Week
"As drone technology becomes cheaper and more commercially available, the U.S. Air Force is increasingly worried about the threats posed by small UAS such as quadcopters. But while the service is developing the tools to defend against these systems—from jamming their electronics to shooting them down—it lacks the legal authority to use them, says Gen. James Holmes, commander of Air Combat Command."

"Dealing with commercial drones near protected facilities is a complicated legal issue. The FAA is responsible for all U.S. airspace, and has already established no-fly zones over every U.S. military base so any drone flight there is illegal. But determining when it is OK for the military to disable or destroy UAS that wander into its facilities is still something of a gray area. Outside the Pentagon and FAA, multiple government agencies are involved, including the Department of Homeland Security and even the Federal Communications Commission (FCC), which mandates that only government agencies can use jamming against drones."
USAF  drones  UAS  AviationWeek  enforcement  Interference 
july 2017 by pierredv
[pdf] Coordination and analysis of GSO satellite networks, Seminar Dec 2012, Jorge Ciccorossi
slide 2:
Several Interference Criteria utilized to evaluate
compatibility between GSO satellite networks.
 Trigger Arc
 DT/T
 C/I

slide 15
I/N=-12 dB --> Degradation ~ 0.26 dB --> ΔT/T = 6%

slide 28
References to various ITU-R studies
GSO  satellite  ITU  ITU-R  coordination  interference  *  tutorial 
may 2017 by pierredv
The 4G threat: future-proofing the UK radar network - Airport Technology
"... a critical upgrade project undertaken by NATS, the UK's leading supplier of air traffic control (ATC) services, has quietly slipped under many people's radar.

The organisation, which provides ATC solutions to 15 UK airports, including Heathrow and Gatwick, and all en-route air traffic, has become the first operator to proof its radar systems against interference from the 4G network."

"NATS' solution to the problem involves upgrading its existing radars with filters that suppress the electrical waves generated by 4G network frequencies. "
UK  ATC  aviation  interference  Ofcom  NATS 
may 2017 by pierredv
Low Earth Orbit Constellations Could Pose Interference Risk to GEO Satellites, Oct 2015
"A proposed wave of low Earth orbit communications satellite constellations could become an interference hazard for satellites in geostationary orbit even if those new systems comply with existing rules, some satellite operators fear."

"[Daryl Hunter, senior director of regulatory affairs for ViaSat]said that problem could be exacerbated if a number of the proposed NGSO satellite systems are launched over the next several years. If some of them violate the ITU rules, he said, it could be difficult to determine which ones are causing the excess interference."
GSO  NGSO  satellite  interference  SpaceNews  ViaSat  O3b  Intelsat 
may 2017 by pierredv
Spectrum Management for Science in the 21st Century | The National Academies Press
National Research Council (NRC) report
"Recognizing the growing importance of radio observations to their respective missions and the increasing potential for interference from new wireless technologies, NASA, the Department of Commerce, and the National Science Foundation commissioned the National Research Council (NRC) to identify the spectrum needs of today’s scientific activities and to assist spectrum managers in balancing the requirements of scientific uses of the spectrum with those of other interests. . . . chose to consider only the passive (“receive-only”) scientific applications of the radio spectrum, and specifically how the requirements for spectrum could be expected to evolve over the next two decades."

"The committee focused on three major topics: Earth remote sensing (see Chapter 2), radio astronomy (see Chapter 3), and interference mitigation (see Chapter 4). . . . The findings and recommendations are detailed in Chapter 5. "

"Recommendation 10: FCC and NTIA regulators should actively define interference metrics, expand enforcement technology, and include descriptions of passive EESS and RAS systems in regulators’ databases."

"Recommendation 13: The FCC and NTIA should require active service users to use their allocated portions of the spectrum more effectively. Spectral efficiency requirements should be built into FCC and NTIA licensing policies for future spectral assignments."
spectrum  regulation  science  reports  NationalAcademies  Interference  efficiency 
may 2017 by pierredv
Earth stations on moving platforms - IEEE Xplore Document
Via Dale Hatfield
Enrique Cuevas, Vijitha Weerackody et al
Earth stations on moving platforms (ESOMPs) are a new generation of satellite terminals designed to provide on-the-move broadband communication services to land vehicles, aircraft, and ships. ESOMPs use very small antennas and require tracking systems to maintain accurate pointing to the target satellite. Because they operate while moving, there may be instances when antenna mispointing may produce interference to other satellites or other radio systems. To account for pointing errors and other time-varying characteristics of a network of ESOMPs, it is necessary to use statistical approaches for interference analysis. This paper provides an overview of ESOMPs, their technical and operational characteristics, statistical approaches for interference analysis, and the standards and regulatory challenges that must be addressed for their successful operation.
satellite  Interference  statistics 
may 2017 by pierredv
Better Protection of Spectrum Is a Defense Necessity | SIGNAL Magazine - Dec 2016
By Chief Warrant Officer 5 Todd D. Conley, USN (Ret.)
"Cultural change, top-down mandates and additional resources are required to avoid dangerous scenarios."

"EMI broadly encompasses any type of interference, man-made or naturally occurring, that can potentially disrupt, degrade or otherwise impede authorized emissions over approved portions of the EMS. The interference can be intentional or inadvertent, hostile or friendly, military or civil, foreign or domestic. It can originate from a jamming device, procedural mistakes, malfunctioning equipment or improper system operation. EMI also can have static causes, such as structural or topographical obstructions."

“A mechanism within the Defense Department known as the EMI Resolution Process could become a cornerstone capability for EMS protection, but it needs a comprehensive construct with a cohesive supporting architecture. The EMI Resolution Process spans 10 principal functional areas and subprocesses, and a few of its functions occur in parallel. The areas are monitoring; detection; mitigation of EMI effects; reporting; characterization and classification; geographical location; identification; response planning; resolution of source cause; and archiving.”
DoD  interference  EMC  EMI 
march 2017 by pierredv
UK regulator to allow Wi-Fi at 5.8 GHz before rest of EU — PolicyTracker: the spectrum management newsletter
Interference concerns came from users of the fixed satellite service; radar; programme making and special events equipment; broadband fixed wireless access; amateur radio and satellite; and short-range devices (SRDs), including drones. "We examined these coexistence arguments... and have not found a compelling reason not to authorise 5.8 GHz for Wi-Fi services given the benefits this extension will deliver for citizen[s] and consumers," Ofcom said. It set a proposed power limitation at 200 mW equivalent isotropically radiated power (EIRP) per channel, with no fixed outdoor use, and with a requirement to implement specific techniques to avoid interference into radar.
PolicyTracker  Wi-Fi  Ofcom  Interference  radar  5GHz 
march 2017 by pierredv
5G has the potential to harm radio astronomy services — PolicyTracker - Feb 2017
Following the detection of radio signals from a distant galaxy last month, PolicyTracker spoke in more depth to Benjamin Winkel, the man responsible for spectrum management at the Effelsberg radio telescope, about the issues facing radio astronomy.
PolicyTracker  receivers  Interference  astronomy 
february 2017 by pierredv
Showing the HF Interference Problem from Ethernet over Powerline Devices -
Over on our YouTube channel we’ve uploaded a new video that shows how bad the interference from Ethernet over Power devices can be. Ethernet over Power, Powerline Networking, Powerline Communications or ‘HomePlug’ is a technology that allows you to use any of your household power outlets as an internet Ethernet port, completely eliminating the need for runs of Ethernet cabling. They are capable of high speeds and can be used anywhere in the house assuming the two plugs are on the same power circuit.

Unfortunately these devices tend to wipe out almost the entire HF spectrum for anyone listening nearby.
RTL-SDR  Interference  HF 
january 2017 by pierredv
New intergalactic signals prompt calls for better co-ordination of other services — PolicyTracker:Jan 2017
Benjamin Winkel, a spectrum manager and scientist at the Effelsberg Observatory, told PolicyTracker that “in practice we more often have problems with unlicensed interferers. For example, short range radars with their large fractional bandwidth do a lot of harm”.

However, Winkel said typical signal levels from GSM at 900 MHz or 1800 MHz were high enough at the Effelsberg Observatory to drive its receivers into saturation, which causes blocking or produces intermodulation products that could masquerade as an astronomical source.

Satellite services can also be a problem, said Winkel. “Iridium is a prominent example. Their satellites have polluted 1610.6-1613.8 MHz, which is our band, for more than a decade, because their spectral sidelobe suppression isn't good enough. But obviously it is often impossible to fix the satellites when they are in orbit."
PolicyTracker  astronomy  interference  Iridium  intermodulation 
january 2017 by pierredv
P3 launches drone program aimed at helping U.S. operators | FierceWireless Nov 2016
"P3 Communications, a global consulting and engineering services company, announced the launch of the unmanned aerial vehicles program, which initially will be deployed by P3’s interference hunting team. The team tracks down and eliminates sources of RF interference that can result in everything from minor static and dropped calls to interruptions in vital data connections and throughput."
FierceWireless  drones  Interference 
november 2016 by pierredv
FAA issues GPS interference flight advisory : GPS World June 2016
[[Editor’s note: After this story was posted, and after the Navigate! enewsletter containing it was sent out to 27,128 subscribers, GPS World received notice that in fact the U.S. Navy canceled plans to jam GPS signals in the vicinity of the China Lake, California, Naval Air Weapons Station. The Aircraft Owners and Pilots Association (AOPA) had raised concerns about the impact on civilian air traffic and the size of the affected area. The Navy did not reveal the cause of the cancellation, other than to say the reason was “internal.”]]
GPS  NOTAM  aviation  FAA  interference 
september 2016 by pierredv
Why we lost the weather radar channels
In twenty cases of reported interference, the following themes stood out (some of these overlap, so if you add them up you will get to more than 20):

DFS was disabled in three.
TDWR  5GHz  interference  radar  DFS 
september 2016 by pierredv
FOIA Request Turns Up Info on Non-FCC-Compliant Transmitters. | CommLawBlog
"AT&T’s Puerto Rico transmitter was certified for operation over 5735-5840 MHz, but it was being operated at a frequency outside that range. Moreover, the transmitter lacked the required capability to listen for weather radar signals, and if it found them, to avoid the frequencies on which they occur – a feature called “dynamic frequency selection,” or DFS. The transmitter was manufactured by Motorola, which knows how to comply with FCC technical rules. But the transmitter was non-compliant when FCC inspectors found it in operation – on a non-certified frequency and lacking DFS – in AT&T’s Puerto Rico system. Moreover, the FCC has identified other non-compliant transmitters operating in the same band. In every case we know of, the transmitter was made by Motorola, and all came from the same “Canopy” product line. What went wrong?"
CommLawBlog  Mike-Marcus  Mitchell-Lazarus  TDWR  interference  5GHz 
september 2016 by pierredv
Police Baffled? Send For The Radio Amateurs! | Hackaday Aug 2016
"Eventually they approached the ARRL, the USA’s national amateur radio organisation, who sent along [Kermit Carlson, W9XA] to investigate. He fairly quickly identified the frequencies with the strongest interference and the likely spot from which it originated, and after some investigation it was traced to a recently replaced neon sign power supply."
Interference  RF-noise  public-safety  ARRL 
august 2016 by pierredv
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