2002-042B
DRTS, a Data Relay Test Satellite for data relay and intersatellite communications, was built by Mitsubishi. DRTS was named Kodama ('echo'). Originally two satellites were to be launched, but DRTS-E was cancelled in 2001 and only DRTS-W was retained.
DRTS was a box + 2 panels + antenna, mass 2800 kg launch, 1500 kg BOL. 1300 kg dry. Size 2.2 x 2.4 x 2.2m with 17m span. The 1700N IHI COMETS UPS was downrated to 500N for a gentler burn. Ka/S band 3.6m dia dish. At 90E. Kodama was launched in 2002 by H2A. The third apogee firing failed due to oxidizer depletion. RCS firings later got Kodama to GEO at 90.8E.
Carried out the High Speed Data Relay Experiment, 240 Mbit/s; High Accuracy Acquisition and Tracking Tech Expt., for onboard acquisition of the satellites that DRTS relays from and to; and the Communications Network Experiment, with time allocation methods on user satellites. Kodama relayed some Earth images from Midori-II; after that satellite failed, Kodama had to wait for the launch of Daichi.
| DRTS | |||
| Date | Time | Event | Orbit |
|---|---|---|---|
| 2002 Sep 10 | 0820 | Launch by H2A 2024 | TNSC |
| T+1:10 SSB 1-2 on | |||
| T+1:46 SRB-A sep | |||
| T+1:47 SSB 3-4 sep | |||
| T+2:24 SSB 1-2 sep | |||
| T+4:10 upper fairing sep | |||
| T+6:28 MECO (earlier than this) | |||
| T+6:36 Stage 1 sep | |||
| T+6:42 SES-1 | |||
| T+12:58 SECO-1 (later) | |||
| T+13:48 USERS sep | |||
| T+16:18 Lower fairing sep (2 pieces + adapter) | |||
| T+26:17 SES-2 | |||
| T+28:42 SECO-2 | |||
| T+29:18 DRTS sep | |||
| 2002 Sep 11 | 0021 | LAM1 Apo 2, 60 min burn | 780.99 7414 x 36013 x 12.0 |
| 2002 Sep 12 | 0221 | LAM2 Apo 4, 60 min burn | |
| 2002 Sep 13 | 0126 | LAM3 Apo 5; failed after 103s of 204s | |
| 2002 Sep 14 | AOCS burn to correct for GEO | ||
| 2002 Sep 15 | Deploy antennas | ||
| 2002 Sep 19 | 1446.16 35936 x 36029 x 0.1 GEO 134.4E-2.5W/d | ||
| 2002 Oct 6 | 1441.04 35832 x 35934 x 0.1 GEO 93.4E-1.2W | ||
| 2002 Oct 10 | 1436.56 35777 x 35814 x 0.1 GEO 90.8E | ||
| 2002 Oct 11 | On station | ||
| 2003 Jan 10 | Declared operational | ||
| 2003 May 9 | 1436.11 35779 x 35794 x 0.1 GEO 90.8E | ||
| 2003 Oct 29 | Safemode after solar flare | ||
| 2003 Nov 25 | Operations resumed | ||
| 2006 Jan | Tests with Daichi scheduled | ||
| 2006 Aug 6 | 1436.11 35774 x 35799 x 0.1 GEO 90.7E | ||
| 2017 Jul 28 | 1436.07 35778 x 35794 x 5.1 GEO 90.9E | ||
| 2017 Jul 31 | Orbit raise | ||
| 2017 Aug 3 | Orbit raise | 1450.33 35971 x 36167 x 5.1 | |
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