EARTH SENSOR

摘要

PURPOSE:To acquire the sensor at all times and to perform attitude control by switching and using infrared detecting means for plural visual-field directions. CONSTITUTION:An earth sensor 1 is equipped with two infrared optical packages 2 and 3 and two pyroelectric elements are provided therein. Those pyroelectric elements have visual fields in directions of CH1-CH4. Those pyroelectric elements are switched and used to acquire the earth at all times. The pyroelectric elements for CH2 and CH3 are put in operation at a remote position on an elliptic track and the pyroelectric elements for CH1-CH4 are operated in combination at a nearby point.