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pierredv : gso   18

Cruising for Higher Throughputs - Northern Sky Research Aug 2018
"From 300 Mbps to MSC cruises announced by Marlink in June 2017 to the most recent 3.2 Gbps of throughput delivered to a Carnival Cruise Line Ship in May of 2018, there are few satellite sectors that are seeing such record levels of growth to a customer’s single location . With over 570 Gbps of throughput growth expected between 2017 – 2027 according to NSR’s Maritime SATCOM Report, what applications are driving this growth? "
NSR  satellite  broadband  maritime  GSO  NGSO 
august 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
Astranis Targets Cellular Backhaul with GEO Smallsats - Via Satellite - Mar 2018
"NewSpace startup Astranis is sending its smallsats all the way out to Geostationary Earth Orbit (GEO) to deliver broadband internet. From there, the company intends to work alongside other satellite operators and Mobile Network Operators (MNOs) to meet demand for cellular backhaul."

"Each smallsat will clock in at around 300 kg, and will carry four to six Ka-band spot beams and broader Ku-band beams."

"Astranis’ primary business case rests on using its satellite bandwidth for cellular backhaul. Gedmark believes it comes down to a matter of cost: the reason MNOs are lacking coverage in many regions is because it’s economically unfeasible to build fiber out to far-flung cell towers."
space  start-ups  GEO  GSO  cellular  smallsats 
march 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
Non-geostationary satellites want more spectrum sharing in 3.7-7 GHz bands | PolicyTracker: the spectrum management newsletter
"WRC-19 Agenda Item 9.1.3 calls for studies into the technical, operational and regulatory feasibility of allowing new non-geostationary satellites in the 3.7-4.2 GHz (C-band), 4.5-4.8 GHz, 5.925-6.425 GHz and 6.725-7.025 GHz bands allocated to fixed satellite services (FSS). The proposal isn't particularly controversial but any additional spectrum sharing must be handled with care, satellite operators say."

"Resolution 157 from WRC-15 [notes] that both orbits and their associated spectrum are valuable resources, equitable access to which should be safeguarded for the benefit of all countries"

"Current ITU rules dealing with the protection of GSO systems from non-GSO systems in the C-band were set over 15 years ago based on some now older non-GSO designs, said EMEA Satellite Operators Association secretary-general Aarti Holla-Maini. Those rules were originally made for the benefit of non-GSO operators, and were an alternative to the more general rule that simply obligates non-GSO systems to protect geostationary systems. Satellite manufacturers now want updated values in the ITU rules that will give them more flexibility in non-GSO designs while still protecting GSO satellites."
PolicyTracker  satellite  C-band  FSS  NGSO  GSO  ITU 
december 2017 by pierredv
ViaSat Willing To Bet Big on Super-high-throughput Satellites -, Nov 2015
"Satellite broadband hardware and service provider ViaSat Inc. on Nov. 9 said it is likely to order the first of what is intended as a three-satellite constellation of ViaSat-3 Ka-band broadband satellites covering the globe with throughput capacity of 1 terabit per second each."
SpaceNews  ViaSat  HTS  satellite  GSO 
september 2017 by pierredv
Boeing Taps ArianeGroup For Next-Gen Satellite Propulsion | World Satellite Business Week content from Aviation Week
"Boeing and ArianeGroup will jointly develop a new generation of electric thrusters to increase a satellite’s payload and reduce the time necessary for orbit-raising. ArianeGroup’s Orbital Propulsion department, based in Lampoldshausen, Germany, is developing a dual-mode, radio-frequency ion thruster (RIT 2X) ..."

"The radio-frequency ion thruster uses a high-frequency electromagnetic field, as opposed to an anode and a cathode, to ionize xenon gas atoms."

"Thus far, Boeing has used more conventional xenon-ion propulsion, which is lightweight but can take seven months to raise the orbit of a geostationary telecommunications satellite."
Boeing  satellite  ArianeGroup  GSO  AviationWeek 
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
FCC Denies EchoStar Request for Co-primary Geostationary Orbit Ka-band Designation | TvTechnology
"The FCC's International Bureau last week denied a Petition for Rulemaking filed by EchoStar Satellite Corporation requesting the commission modify its Ka-band plan to permit geostationary satellite orbit (GSO) fixed satellite service (FSS) operations on a co-primary basis in the 18.8-19.3 GHz and 28.6-29.1 GHz bands designated for non-geostationary satellite orbit (NGSO) FSS. EchoStar's petition received support from SES AMERICOM, Hughes Electronics Corporation, and Hughes Network Systems, which supported EchoStar's assertion that the spectrum is lying fallow and co-primary use could lead to the introduction of additional and innovative services."
TVTechnology  EchoStar  satellite  rulemaking  FCC  GSO  NGSO  Ka-band 
august 2017 by pierredv
[pdf] Technical Characteristics and Regulatory Challenges of Communications Satellite Earth Stations on Moving Platforms, Cuevas & Weerackody
Earth stations on moving platforms (ESOMPs) are a new generation of satellite terminals designed
to operate at the X-, C-, Ku-, and Ka-frequency bands and provide on-the-move broadband communication
services to land vehicles, aircraft, and ships. Some of the distinguishing characteristics
of ESOMPs are that they use very small antennas and require tracking systems to maintain
accurate pointing to the target satellite. However, because they operate while on the move, there
may be instances when antenna-pointing errors may result in increased interference to other
co-frequency neighboring satellites or other radio systems. To account for pointing errors and
other time-varying characteristics of a network of ESOMP terminals, it is necessary to use statistical
approaches for interference analysis such that the resulting interference is not harmful to the
victim network. The Johns Hopkins University Applied Physics Laboratory (APL) made significant
technical contributions on these topics and is actively engaged in the development of international
standards for ESOMPs. This article 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.
UAS  NGSO  GSO  ESOMP  satellite 
june 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
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
47 CFR 25.208 - Power flux density limits. | US Law | LII / Legal Information Institute
Cites to Recommendation ITU-R S.1428
"... the power flux density at the Earth's surface produced by emissions from a space station for all conditions and for all methods of modulation shall not exceed the following values ..."
FCC  rules  EPFD  satellite  interference  field-strength  FSS  GSO  NGSO  non-GSO  SkyBridge  47CFR  pfd 
july 2015 by pierredv
WRC-2000: Results of Interest to Satellite Operators - Via Satellite
See particularly "Sharing between non-GSO FSS, GSO FSS and FS" Line via Rich Currier, March 2014
25.208  EPFD  WRC  SkyBridge  WRC-2000  satellite  interference  field-strength  FSS  GSO  NGSO 
march 2014 by pierredv

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