Problems concerning critical irradiation of instruments installed on satellites

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Instrument Errors, Radiation Damage, Satellite-Borne Instruments, Solar Radiation, Elliptical Orbits, Optical Measuring Instruments, Satellite Perturbation, Synchronous Satellites

Scientific paper

The paper examines a class of problems concerning the determination of orbital sectors for satellites in which on-board instruments are located under conditions of critical irradiation by the sun. Problems considered include the critical irradiation of optical instruments rigidly mounted on a satellite with one axis oriented toward the center of earth and the other along the normal to the orbital plane, disturbances of satellite orientation, and the critical irradiation of scanning instruments as well as instruments on a geosynchronous satellite. A method for solving such problems is proposed which is based on the reduction of critical irradiation conditions, expressed in vector form, to a first-order trigonometric inequality. It is shown that this method can be used to obtain an explicit solution for a wide range of nongeosynchronous problems as well as an approximate solution for geosynchronous problems. Situations involving highly elliptical orbits are briefly investigated.

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