recentpopularlog in

pierredv : esa   10

ESA spacecraft dodges potential collision with Starlink satellite - SpaceNews.com Sep 2019
"The European Space Agency said Sept. 2 it maneuvered one of its Earth science satellites to avoid a potential collision with a SpaceX Starlink satellite, the first time the agency said it’s had to maneuver to avoid a satellite associated with a broadband megaconstellation."

“The case just showed that, in the absence of traffic rules and communication protocols, collision avoidance has to rely on the pragmatism of the involved operators,” Krag said. “This is done today by exchange of emails. Such a process is not viable any longer with the increase of space traffic.”

"While ESA sounded worried about the close approach, others in the industry were nonplussed by the attention it received. "
SpaceNews  SpaceX  Starlink  ESA  space-debris  space-junk 
september 2019 by pierredv
FPAs: Moving Parts Still Have the Upper Hand - NSR Apr 2019
"Given the number of Non-GEO HTS constellations announced, from early "launch, full production, and those in early development, it is safe to say the skies will be filling up fast with more satellite capacity than ever before. On the ground, development of next-generation, electronically-steered terminals continues with announcements such by Kymeta, Phasor, and OmniAccess among others. Given this, all signs indicate that electronically-steered antennas (ESAs), which will inherently decrease the number of moving parts, are key to the future of satcom. However, delays are quite common, from Kymeta requiring 5 years to ship their first product, and Phasor postponing their ESA deployment, to name just a few.

Meanwhile, mechanically-steered antennas (MSAs) are on the market now, with developed supply chains and partnerships, doing the job with a host of moving parts."

"According to NSR’s Flat Panel Satellite Antennas, 4th Edition, annual shipments of mechanically-steered antennas (MSA) FPAs will grow to over 48,000 units by 2028, with over 7,000 shipped last year. MSAs are forecasted to represent only 3% of all future shipped FPAs, yet they represent 95% of the market today. In fact, despite ESA development, MSAs are expected to retain leadership in key verticals."

"Advanced capabilities are desired, but reliability is required."
NSR  satellite  antennas  Kymeta  Phasor  market-research  ESA 
april 2019 by pierredv
Satcom Future Hinges on Electronically-Steered FPAs - NSR Mar 2019
"When the term “flat panel antenna” (FPA) is mentioned, most envision a completely flat, non-moving piece of communications technology. These systems, specifically electronically-steered antennas (ESAs), capable of faster tracking and pointing than parabolic ones, are seen as an impending necessity for satcom, especially given the soon-to-be full skies of LEO constellations. Interest and development in this technology has grown significantly in recent years, from Kymeta shipping the first commercial ESAs in 2017 to large contracts signed, pending product release.

However, ESA technology is still under-developed, mostly unavailable, expensive to engineer and suffering numerous delays. Currently, only 4 manufacturers (Kymeta, hiSky, SatCube, and SatPro) have ESAs for broadband-via-satellite available on the market, and given the importance of this technology for LEO networks, one wonders just when will this technology take off, and what happens if it does not?"

"NSR’s Flat Panel Satellite Antennas, 4th Edition report forecasts the market to transition strongly after 2020, with ESAs accounting for 97% of FPAs shipped in 2028. While mechanically-steered antennas (MSAs) currently dominate the FPA market, at 95.5% of shipped units, non-GEO networks, competition, and improved technology are expected to strongly pivot market take-up once LEO constellations are launched and operational. However, MSAs have begun to make successful inroads, and in some cases are expected to continue to provide competition to ESAs even after the technology becomes more available."
NSR  satellite  antennas  FPA  ESA  market-research 
march 2019 by pierredv
July 2018 - On the EU's Space Program and new EU Agency for Space Proposal | Via Satellite
"The European Commission (EC), seeking to assert more control over European space policy, regulation and governance, has published a proposal for a regulation establishing the EU space program and the EU Agency for the Space Program."
ViaSatellite  EC  EU  space  ESA  Europe  EuropeanCommission 
july 2018 by pierredv
SpaceDataHighway Achieves 10,000 Successful Laser Connections - Via Satellite - May 2018
"The SpaceDataHighway system, a public-private partnership between the European Space Agency (ESA) and Airbus, has achieved 10,000 successful laser connections. The reliability rate has reached 99.8 percent, and during the first one and a half years of routine operations, these successful connections have downloaded more than 500 terabytes of data."

"The system’s satellites are designed to lock on to low-orbiting satellites via laser and collect their data as they travel in Low Earth Orbit (LEO) scanning the Earth. From its position in Geostationary Earth Orbit (GEO), the SpaceDataHighway acts as a relay, transmitting the large quantities of data down to Earth in near-real time, at a speed of 1.8 Gbit per second."

"Each day, the SpaceDataHighway is able to relay up to 40 terabytes of data acquired by observation satellites, Unmanned Aerial Vehicles (UAV), or aircraft to Earth."
ViaSatellite  space  Communications  ESA  Airbus  reliability  optical-communications  LEO  GEO 
may 2018 by pierredv
European Space Agency teams with ICEYE Finnish start-up - BBC News Mar 2018
"The European Space Agency is to work with Finnish start-up ICEYE on ways to exploit its novel radar satellites. ICEYE-X1 was launched in January - the first of multiple spacecraft that will go up in the coming years. About the size of a suitcase, these are the world's smallest synthetic aperture radar satellites and cost a fraction of traditional platforms."

"ICEYE wants to couple this vision with high temporal resolution, meaning a single spot on the Earth's surface would be surveyed several times a day. Algorithms will scour the data to detect significant changes. High-repeat requires a network of satellites, and ICEYE envisages perhaps 30 platforms in orbit."
BBC  space  EO  EarthObservation  ICEYE  satellite  smallsats  ESA  SAR  radar 
march 2018 by pierredv
Bad coordinates led Ariane 5 launch astray, investigators conclude - SpaceNews.com
"The European Space Agency-led independent enquiry commission concluded that Ariane 5’s inertial navigation system was fed the wrong azimuth. That sent the rocket 20 degrees off course, causing alarm nine and a half minutes into the mission when Ariane 5 left the view of the ground station monitoring its intended path."

"SES-14 and Al Yah-3, the two satellites aboard the rocket, are both healthy but will need extra time to reach their operational orbits and enter service. "
Ariane  ESA  space  launch  errors 
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
ViaSat Joins DeSIRE II Remotely Piloted Aircraft Systems Project Consortium | ViaSat
As part of the consortium, ViaSat is taking the lead in developing the communication, navigation and sensing (CNS) technologies for real-time RPAS command and control across Ka- and L-band satellites. ViaSat will provide an advanced satellite communications (satcom) system that includes modems for both frequency bands and modems for system gateways to demonstrate how a satcom system can lead to the safe use of RPAS in "unsegregated" or civilian airspace.
ViaSat  press-release  satellite  drone  ESA  Ka-band  L-band 
august 2017 by pierredv
Space debris must be removed from orbit says ESA | Science | The Guardian, Apr 2017
"7th European Conference on Space Debris, which was held at ESA’s Space Operations Centre (ESOC) in Darmstadt, Germany."

"ESA Space Debris Office. His team monitors the 10 satellites that ESA currently operate in low Earth orbit to protect them from the swarm of human-made debris that now surrounds our planet. On average there is a high risk alert of a potential collision every week, and every ESA satellite has to be manoeuvred to avoid a collision once or twice a year."

"The nightmare scenario that space debris experts contemplate is called the Kessler syndrome, after American astrophysicist Donald Kessler. In 1978, while working for Nasa, he published an analysis that showed frequent collisions exponentially increased the amount of space debris, leading to many more collisions, leading to much more debris until we lose the use of certain orbits because anything we put there would certainly be hit."
space-debris  space  space-junk  ESA  TheGuardian 
july 2017 by pierredv

Copy this bookmark:





to read