ENHANCED GROUND BASED PRECISE ATTITUDE DETERMINATION METHOD OF IMAGING SATELLITE

摘要

PURPOSE: An enhanced ground based precise posture determination method of a low-orbit imaging satellite is provided to accurately determine the posture of the satellite by dually using gyro measurement data and star tracker measurement data. CONSTITUTION: Gyro measurement data and star tracker measurement data are obtained in different intervals through a gyro sensor and a star tracker using a dual MIL-STD-1553 bus communication device (S100). The gyro measurement data and the star tracker measurement data are stored and transmitted to a ground station (S200). A posture quaternion estimated value is repeatedly predicted until the star tracker measurement data is received after calculating an angular speed by restoring the transmitted gyro measurement data again (S300). A modified value is calculated by using the posture quaternion estimated value and the star tracker measurement data, and an error posture quaternion is applied as a corrected value by using the modified value (S400). [Reference numerals] (S100) Measured data obtaining step; (S200) Measured data transmitting step; (S300) Angular speed calculating and predicting step; (S400) Correcting step