PRECISION MEASUREMENT METHOD AND SYSTEM FOR STAR SENSOR

摘要

A precision measurement method and system for a star sensor. The method includes : 1) fixing a star sensor to the earth; 2) inputting into the star sensor a time T relative to J2000.0 by the test starting time; 3) determining a direction vector in a J2000.0 rectangular coordinate system according to the right ascension and declination of a guide star in the J2000.0 coordinate system and the visual motion parameters (a',d'); 4) converting the direction vector of the guide star in the J2000.0 rectangular coordinate system into a direction vector in an Epoch ecliptic coordinate system; 5) converting the direction vector in the Epoch ecliptic coordinate system into a direction vector (VCRFT) in a celestial coordinate system; and 6) changing the direction vector in the celestial coordinate system into a direction vector (VTRF) in an earth-fixed coordinate system and obtaining the precision of the star sensor on the basis of the direction vector (VTRF) in the earth-fixed coordinate system.