The second-generation Indian communication satellite INSAT-ii is scheduled for launch in 1991-92. The primary attitude sensor in this satellite is a two-axis scanning infrared earth sensor. The satellite carries three...
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(纸本)0819405876
The second-generation Indian communication satellite INSAT-ii is scheduled for launch in 1991-92. The primary attitude sensor in this satellite is a two-axis scanning infrared earth sensor. The satellite carries three earth sensors, one being used exclusively in transfer orbit. The earth sensor contains an oscillatory scan mechanism which has been qualified for 10 years life in orbit. A mirror is made to oscillate on a taut band at low frequency by a sensor and torquer system. Two sensors nominally scan in the east-west direction while the third sensor scans in the north-south direction. The sensor has features to work in presence of sun/moon interference. The paper describes the elaborate qualification tests and characterization carried out in thermo-vacuum conditions. The sensor has a thermal design which was verified by a thermo-vacuum solar simulation test.
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