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Technical Specifications
The BLOCK IIR
satellites, SVNs 41 through 62, are the
satellites currently being deployed. Block IIR satellites are
designed to provide at least 14 days of operation without contact
from the control segment and up to 180 days of operation when
operating in the autonomous navigation (AUTONAV) mode. Block IIR
satellites have the ability to be launched into any of the
required GPS orbits with 60-days notice.
In 1989 General
Electric AstroSpace (now Lockheed Martin) was awarded the contract to build
21 Block IIR satellites.
NAVSTAR GPS/Block IIR Satellites |
| PAYLOAD
CAPABILITIES |
| Types of Services |
Navigation |
| Downlink frequencies |
1572.42 MHz and 1227.6 MHz (L-Band) 2227.5
MHz (S-Band) |
| CORE BUS
SPECIFICATIONS |
| Prime Contractor |
Lockheed Martin
|
| Platform |
based on
AS-4000 bus |
| Launch Mass |
2032
kg (4478 lbm) |
| Design Life |
10
years |
STRUCTURE |
| Dimensions (H x W x L) |
152
x 193 x 191 cm (5 x 6.33 x 6.25 ft) |
| Construction |
aluminum
honeycomb panels |
POWER SYSTEM |
| Payload Power
(EOL) |
1.136
kW |
| Solar Arrays |
2
panel using N-on-P silicon cells |
| Batteries |
2
- NiH2 |
ATTITUDE CONTROL SYSTEM |
| Stabilization |
3-axis
stabilized |
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