Magnet measuring technology of micro satellite based on sun sensor and gyro auxiliary correction

Magnetometer is the main instrument to determine the attitudes in micro satellite.Magnetometer accuracy is an important indicator which influences the micro satellite attitude performance.In order to improve magnet estimation accuracy,sun sensor and gyro are used to measure and correct the magnetometer error.Magnetometer error estimation method is derived,and satellite pitch angle and angle velocity are calculated through the pitch filter using the output of sun sensor and gyro as observation.Then,the least mean method with pitch filter output is used to calculate magnetometer error.The result can be used to correct the magnetometer output.Simulation shows that the method is simple,and increases the accuracy of the attitude angle by about 1°.The angular accuracy can be increased as much as 0.003°/s or so,and satellite stability is enhanced.It is favorable for imaging tasks,and improves the micro-satellite navigation system performance.