Galileo-IOV (2 sats) - Soyuz-STB/Fregat-MT (VS03) - 12.10.2012 18:15 UTC

[PIN]

Поял, спасибо.

[Dude]

Dude пишет:

Все маневры, включения МДУ (кроме первого, когда Фрегат работал на 8 секунд дольше плана, исправляя косяк третьей ступени РН) , СОЗ и ДМТ прошли штатно, согласно циклограмме.
Четвертое включение было штатным, после него прошла пассивация.
Могу это ответственно утверждать как человек, непосредственно работающий с телеметрией Фрегата и присутствовавший в комнате 100 КП от начала и до конца.

ну, я-то вам верю, каталог норада в начале может путать объекты или поймать РБ на переходной между 3-м и 4-м, но со временем этот вопрос прояснится и уточнится вместе с орбитой и RCS 38859-го объекта(RCS у Фрегата около 5).
пока что так...

чтобы закрыть тему.
NORAD #    38859
COSPAR designator    2012-055-C 
Epoch (UTC)    2012-11-01 21:46:53
Inclination    55.353
Period    14h 23m 47s (863.78 min)
Semi-major axis    30 045 km
Perigee x Apogee    23 641 x 23 693 km

[PIN]

Чтобы закрыть тему, имею сообщить, что аппараты в добром здравии и функционируют штатно.
Хотя, в одну из ночей пришлось собираться "по тревоге" и мчать по ночной Тулузе. Но все уже в прошлом...

[PIN]

http://www.gsc-europa.eu/notice-advisory-to-galileo-users-nagu-2014014

[anik]

Trouble Aboard Galileo Satellite
http://gpsworld.com/trouble-aboard-galileo-satellite/

"Speculation by unofficial sources is mounting that something is wrong with the satellite, in particular with its passive hydrogen maser, used for timing the signal for synchronous transmission with other Galileo satellites. The hydrogen maser has "a known problem" according to one source. This is why the web site shows GSAT0104, also known as FM04 and E2, as currently using a rubidium atomic frequency standard"

"According to reports, the root cause of the outage is under investigation. Some unofficial sources have gone so far as to speculate that GSAT0104′s useful transmission life may be over"

[anik]

Peter B. de Selding @pbdes

1 of 4 Euro Galileo In-Orbit Validation sats was shut down by grnd teams May 27 after sudden loss of transmission power on 2 of 3 channels. Galileo managers to restart defective sat wk of July 7 to test reaction, try to determine cause of sudden power drop.

[anik]

http://www.insidegnss.com/node/4081

Sources in Brussels say the recently reported "power loss" that threatens to end the brief transmission life of Galileo GSAT0104, the fourth Galileo in-orbit validation (IOV) satellite, has nothing to do with the onboard atomic clocks, but could be caused by a failure in the components linked to the solid-state power amplifier (SSPA), including the output multiplexer, cables and/or antenna.

An investigation to determine the cause of the problem is still ongoing, but sources who wish to remain anonymous say that all of these SSPA-related components are non-redundant, meaning they could be responsible for a so-called "single-point failure." Should the investigation identify any of these as the cause of the problem, there will be little or nothing that can be done to fix it. So the risk of a total loss of one IOV satellite, although not yet confirmed, is real, they say.

[anik]

Galileo's Troubled E20 Satellite Is Alive
http://gpsworld.com/galileos-troubled-e20-satellite-is-alive/

The troubled Galileo E20 satellite restarted E1 signal transmission Wednesday evening, August 6.

Galileo E20, also known as GSAT0104, the fourth in-orbit validation (IOV) satellite, has been set "unavailable until further notice" according to the European GNSS Service Centre because of a sudden, unexpected loss of power on May 27.

Based on a sel ected set of IGS MGEX stations and all CONGO stations, the first signals were tracked at AREG, AUT0, LLAG, and UNB3 at 23:13:00. No E5 signals and no navigation messages are currently transmitted. However, some JAVAD GNSS receivers report fr om time to time false E5a locks with zero or extremely small C/N0.

[anik]

https://twitter.com/pbdes/status/502060008884809728

Euro Space Agency: Still no solution to power-degradation problem on 1 of the 4 Galileo navsats in orbit despite 3.5-month investigation.

https://twitter.com/pbdes/status/502060423932149761

ESA: Anomaly on existing Galileo sats forces bdcast at lowr power levels but users should seeing no performance degradation.

https://twitter.com/pbdes/status/502062317282934785

ESA: We've had anomalies on 3 of the 4 in-orbit Galileo navsats but all w/ different causes, and none serious enough to degrade performance.

[PIN]

Интересно, кто это "сливает". Вычислят - пинком под попу.

[anik]

SOE пишет:
Интересно, кто это "сливает". Вычислят - пинком под попу.

Вообще-то это была официальная пресс-конференция: http://www.spacenews.com/article/civil-space/41616esa-proceeding-with-galileo-launches-despite-in-orbit-satellite-issues

Но, в принципе, можете сообщить кому следует, что это сказал Javier Benedicto, ESA's Galileo program manager.

[PIN]

Не знал, теперь понятно.
Если Хавьер решил рассказать, то, конечно, другое дело