1 July 1991 Static horizon sensor for remote sensing satellite
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Abstract
The Indian Remote Sensing Satellite IRS-1A, launched in March 1988, is a three-axis stabilized, polar sun synchronous satellite orbiting at an altitude of 904 km. Two types of earth sensors are used for pointing and control of the satellite. One is a pair of conical scanning sensors using a rotating germanium wedge prism. The other is a static horizon sensor operating on the principle of radiation balancing. The latter sensor used novel normalization technique for removing the effects due to radiation gradients, which is one of the main problems of this type of sensor. The in-flight performance of the sensor is quite satisfactory with very low noise behavior. However, there were certain problems noticed in the acquisition mode of operation of the sensor which were traced to the heating of the IR filter due to direct sun viewing by the sensor near the poles. Based upon this experience, the configuration for IRS-1B to be launched in 1991 was modified. This paper briefly describes the configuration, the flight performance, and the modification carried out in the future models of the sensor.
© (1991) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
J. A. Kamalakar, Yashwant K. Jain, A. S. Laxmiprasad, M. Shashikala, "Static horizon sensor for remote sensing satellite", Proc. SPIE 1478, Sensors and Sensor Systems for Guidance and Navigation, (1 July 1991); doi: 10.1117/12.45625; https://doi.org/10.1117/12.45625
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