Research on compass error compensation of certain UAS

The main factor leading to decline in geomagnetic navigation accuracy is the carrier magnetic field. Based on analyzing the geomagnetic measurement error which caused by UAS carrier magnetic interference geomagnetic field, lead the 12 coefficient compensation model into UAS´ compass deviation, which used in the geomagnetic matching navigation on small gesture. In the static condition, use the non-magnetic turntable respectively to obtain magnetic data of UAS in the range of ± 30° attitude angle, with interference source or without. The data analysis shows that through the compensation, the error variance of carrier heading angle in ± 5° range is from 2.174° down to 0.350°, and in the rest angle the heading angle´s error variance is from 2.282° down to 0.732°. It satisfies the requirements that the flight course stability should be better than ± 3° when a certain type of UAS in large angle attitude flies.