The Sich-3-R Earth radar observation satellite is developed under the Ukraine’s National Special-purpose Scientific and Technical Space Program to obtain high-resolution radar images of Earth surface regardless of light conditions and weather.
The satellite payload consists of a synthetic-aperture radar comprising a 3-m dia. reflector antenna.
The satellite is developed based on a unified bus with 3-axis active Earth orientation. An ammonia propulsion system in the satellite supports orbital correction maneuvers.
Satellite Basic Specifications
|
Mass, kg: |
|
|
- satellite |
~ 600 |
|
- payload |
~ 230 |
|
Orbit: |
|
|
- type |
circular |
|
- altitude, km |
~ 555 |
|
- inclination, deg |
~ 60 |
|
Attitude control: |
|
|
- type |
3-axis active |
|
- sensors |
star sensor, rate gyros, 3-axis magnetometer |
|
- actuators |
reaction wheels, magnetorquers |
|
Attitude control accuracy, deg, no worse than: |
|
|
- imaging |
0,05 |
|
- standby |
5 |
|
Design life, years |
7 |
Payload Basic Specifications
Synthetic-Aperture Radar
|
Operating wavelength, cm |
~ 3,1 |
|
Sweep area from nadir track, deg |
25—45 |
|
Ground resolution (azimuth × sideward), m: - spotlight mode - stripmap 1 mode - stripmap 2 mode - scanSAR mode |
2 × 2 2 × 2 6 × 10 20 × 20 |
|
Area image size (azimuth × sideward), km: - spotlight mode - stripmap 1 mode - stripmap 2 mode - scanSAR mode |
10 × 8,5 650 × 8,5 650 × 24,3 650 × 57 |
