| Title: | Space Exploration |
| Notice: | Shuttle launch schedules, see Note 6 |
| Moderator: | PRAGMA::GRIFFIN |
| Created: | Mon Feb 17 1986 |
| Last Modified: | Thu Jun 05 1997 |
| Last Successful Update: | Fri Jun 06 1997 |
| Number of topics: | 974 |
| Total number of notes: | 18843 |
It looks the the Russian have finally started a TDRS like system
I think they call it EDRS, recently (OCT) two new Cosmos GEO
Communication satellites have been launched, However they could
be aother communications satellite system. I am taking the A
object as the primary satellite then :
Int NASA degrees
number OBJ # west
1987 084A 18384 at 279.7 deg
1987 091A 18443 at 303 deg drifting towards 360 deg at about 2 deg/day
Does anyone know anymore about these satellites?
Cosmos 1700 was maybe the first EDRS, what was its normal parking
orbit? I think the EDRS freq plane was 10KMHz down link and 14KMhz up
There is some question about 091A drift west:
1 not the primary satellite,
2 moving to new home
3 lost in space
I am calling the GEO sat as EDRS-1 and 2, I have no idea of their
official name.
EDRS-1 1987 084A
1 18384U 87302.44723646 -.00000107 10000-3 0 241
2 18384 1.3823 278.4944 0004956 95.8988 263.7831 1.00276159 294
EDRS-2 1987 091A
1 18443U 87310.42956849 0.00000036 10000-3 0 124
2 18443 1.2653 277.2186 0015043 81.0165 278.7740 0.99869059 107
John
| T.R | Title | User | Personal Name | Date | Lines |
|---|---|---|---|---|---|
| 370.1 | Huh? | LILAC::MKPROJ | REAGAN::ZORE | Thu Nov 19 1987 12:52 | 8 |
Please, when entering technical acronyms, enter the full term
somewhere in the beginning of the note.
What do EDRS and TDRS stand for?
:-)
Rich
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| 370.2 | MONSTR::HUGHES | Greetings and hallucinations! | Thu Nov 19 1987 18:28 | 25 | |
It is more correctly known as the Satellite Data Relay Network (SDRN),
analogous to the US TDRSS (Tracking and Data Relay Satellite System).
Both are intended to remove the current need for ground stations all
over the planet to maintain 24hr contact with satellites and manned
spacecraft. It also allow very high bandwidth transmissions to ground
without the spacecraft having to carry the high power transmitting
equipment. The spectacular wideband video of the repair of Solar Max
was relayed via TDRS-1.
Slots are assigned in the Clarke belt at 95 E, 16 W and 160 W.
Downlinks for the Eastern SDRN are at 10.82, 11.32, 13.7 and 13.52 GHz,
uplinks at 14.62 and 15.05 GHz.
First flight was apparently Cosmos 1700, launched Oct 85 to 95 E.
It was used to relay comms from Mir and Soyuz TM until it started
to drift offstation in Oct 86.
They also refer to a system called Luch, which is really a transponder
system carried on other geosynch satellites, mostly Gorizont and
some Cosmos. It works in frequencies above 10 GHz (11, 20 and 30
GHz ranges). C 1700 carried a Luch transponder as a data relay for
Mir. The technology developed under the Luch program will be applied
to other satellites in the Intercosmos series.
gary
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| 370.3 | SDRN at 95 Deg East ready for service | IMBACQ::BIRO | Tue Jan 12 1988 15:35 | 10 | |
the slot at 95 Deg East has now been filled with 1987-096A
which I think is Cosmos 1897. Most likly this is the first of
the Satellite Data RElay Network (SDRN)
Soon there may not be a need for the Soviet Tracking Ships,
presently it look like the one off of Sable Island has move
and one in Warmer waters has taking over its job.
jb
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| 370.4 | Correction to .3 | IMBACQ::BIRO | Tue Jan 12 1988 15:36 | 7 | |
re: 3
it is not the first SDRN Cosmos 1700 was believe to be,
it looks like it is the C-1700 replacement
jb
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