TDRS-H, I, J will perform on-board MA return service beamforming, which will allow 5 simultaneous spacecraft users. (Note: the MA has enhanced performance.) Additionally, TDRS-H, I, J will have Ka-band service. Initial launch may be as early as July 1999.
More information will be provided as it becomes available.
TDRSS/TDRS-H,I,J Baseline Service Comparison
Service |
TDRSS |
TDRS-H,I,J |
Notes |
Single Access |
S-Band |
FWD |
300 kbps |
300 kbps |
No change |
RTN |
6Mbps |
6Mbps |
Ku-Band |
FWD |
25 Mbps |
25 Mbps |
No change |
RTN |
300 Mbps |
300 Mbps |
Ka-Band |
FWD |
N/A |
50 Mbps |
23/25-27 GHz frequency band |
RTN |
N/A |
600 Mbps |
Number of Links per Spacecraft |
2 SSA |
2 KuSA 2 SSA |
2 KuSA 2 KaSA For TDRS-H,I,J simultaneous operation of S & Ku and S & Ka services a single
SA antenna are required |
Number of Multiple Access Links per Spacecraft |
FWD |
1@10 kbps |
1@10 kbps (8 dB over TDRSS)* |
Anticipated SSA users less than 3 Mbps offloaded to TDRS-H,I,J MA |
RTN |
20@100 kbps |
6 @ 3 Mbps |
Customer Tracking |
150 meters |
3 sigma 150 meters |
3 sigma No change |
| ||||||
*34 to 42 dBW adjustable in 1 dB steps