Multi-Node Motion Estimation Method Based on B-Spline of Array Position and Orientation System

The array position and orientation system (array POS), composed of one main POS multiple sub-inertial measurement units (sub-IMUs), is key equipment in the aerial remote-sensing system, especially multi-load which can provide motion compensation for to improve imaging quality. Nevertheless, information each sub-IMU only realize corresponding load. Ideally, load should be equipped with a compensation, impossible actual engineering considering volume, weight cost. To solve this problem, multi-node estimation method based on B-spline proposed loads without sub-IMUs. Firstly, transfer alignment fiber-grating multi-dimensional deformation was adopted. Motion parameters payload sub-IMUs at different times obtained by observing correcting errors between In way, space-time characteristics interpolation point are fully utilized. Additionally, all fitted through B-spline, during wing considered obtain sub-IMU. spatial correlation node Due full utilization spatiotemporal sub node, high-precision highly reliable not obtained. Furthermore, modified locally affecting other nodes, has advantages simple algorithm easy implementation. Finally, semi-physical simulation ground-loading test conducted. results show that baseline X-axis, Y-axis Z-axis direction improved 0.484 mm, 0.137 mm 1.225 respectively, accuracy roll angle 0.011°.