RISAT-1. Radar Imaging Satellite
RISAT-1. Radar Imaging Satellite
RISAT-1. Radar Imaging Satellite
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Mechanical System<br />
Structure<br />
Thermal System<br />
CFRP - Aluminium prism honeycomb sandwich cylinder with<br />
Aluminium honeycomb panels<br />
Passive / Semi-active thermal control with paints, blankets,<br />
OSRs and closed looped auto temperature controllers<br />
Thermal Control Battery -5 ± 5° C<br />
Electronics<br />
0 to 40° C<br />
Mechanisms<br />
Power System<br />
Solar panels<br />
Solar array power<br />
Chemical Battery<br />
Solar Array Deployment<br />
SAR Antenna Deployment<br />
3 on either side, sun-tracking, 10 m<br />
1500 W, normal to sun<br />
1 x 70 AH Ni-H Battery<br />
Power Electronics Two regulated raw buses (42 & 70 V)<br />
TTC System<br />
Telecommand<br />
Telemetry<br />
PCM/PSK/PM Modulation, 4 Kbps Time tag command facility<br />
PCM/PSK/PM Modulation 4 Kbps (real time); 16 Kbps (playback)<br />
Transponder Uplink frequency : S-band<br />
Downlink frequency : S-band<br />
AOCS<br />
Sensors<br />
Actuators<br />
AOCE<br />
Earth sensors, Star sensors, 4Pi Sun sensors, Magnetometer,<br />
IRU with 3-DTGs, DSS<br />
Reaction wheels, Magnetic Torquers, Reaction control thrusters<br />
Microprocessor based system<br />
2<br />
2<br />
Pointing accuracy<br />
Positional accuracy<br />
Drift rate<br />
Data Handling System<br />
Data rate<br />
RF System<br />
X-band Frequency<br />
<strong>Satellite</strong> Mass<br />
0<br />
± 0.05 about all axes<br />
20 – 25 m (using SPS in autonomous mode)<br />
-5<br />
< 5.0 x 10 deg /sec<br />
2 x 160 Mbps (each polarization)<br />
QPSK Modulated Transmitter<br />
8025 – 8400 MHz<br />
1750 Kg
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