A novel relative motion measurement method based on distributed POS relative parameters matching transfer alignment

The relative motion measurement has become the key technology for high precision imaging of array Synthetic Aperture Radar (SAR), which can be obtained by distributed Position and Orientation System (POS). The traditional method based on absolute parameters matching transfer alignment can measure the relative motion, but it will be affected by the main-system motion error and reduce precision. To solve this problem, a novel relative motion measurement method based on distributed POS relative parameters matching transfer alignment is proposed. Firstly, the relative inertial navigation algorithm is used to preliminarily measure the relative motion. Then, the transfer alignment model based on relative parameters matching is established to rectify the inertial measured error and obtain the high-precision relative motion. Finally, experimental results show the proposed method is effective to isolate the main-system motion error and improve relative motion measurement accuracy compared to the traditional method.