Specifications - Milstar Military Communications Satellites, USA
| Key Data | |
|---|---|
| Start year | 1984 |
| Project type | Military Satellite |
| Base Country | USA |
| Estimated investment | $800 million |
| Completion | 2001 |
| Key Players | |
| Sponsor | US Air Force |
| Project Leaders | MILSATCOM Joint Programme Office at the Air Force Space and Missile Systems Center in El Segundo |
| Lead contractor Construction | Lockheed Martin Space Systems |
| Dimensions | |
| Length | 51 feet (across payload axis) |
| Solar array power | 5,000 watts |
| Orbit altitude | 22,500 miles geosynchronous |
| Launch vehicle | Titan 4/Centaur upper-stage |
| WEIGHTS AND LOADING | |
| Empty weight (typically equipped) | 10,000 pounds |
| MILSTAR LOW DATA RATE PAYLOAD | |
| Data rates | 75 bps for data to 2,400 bps for voice or data |
| Channels | 192 channels (100 at 2,400 bps) |
| UHF service | Four AFSATCOM IIR channels; One fleet broadcast channel |
| ANTENNA ARRAYS | |
| Earth coverage horns | one uplink; one downlink |
| Agile beams | five uplink; one downlink |
| Spot beams | two up/downlink narrow spots (dual use) and one up/downlink wide spot (dual use) |
| UHF antennas | one up/downlink (Earth coverage) |
| Crosslinks | Crosslink antennas: one on the +X wing; one on the X wing |
| MILSTAR MEDIUM DATA RATE PAYLOAD | |
| Data rates | 4.8 kbps for low speed data to 1.544 Mbps for high speed data |
| Channels | 32 MDR channels |
| Antenna arrays | Six distributed user coverage antennas; two narrow spot beam antennas (nulling antennas) |
| Crosslinks - Crosslink antennas | one on the +X wing; one on the -X wing |
| MILSTAR FREQUENCIES | |
| EHF uplink | 44-GHz |
| SHF downlink | 20-GHz |
| SHF crosslink | 60-GHz |
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