Abstract:

The neglect of across-track accelerations can lead to the erroneous estimation of along-track velocities when a space-borne SAR is used to detect moving targets and estimate their motion parameters. The algorithm of detecting and estimating the accelerations of moving targets for space-borne bistatic SAR is addressed, which mainly uses the principle that moving targets relative to space-borne bistatic SAR in Tandem mode have different radial velocities. Different radial velocities are estimated by using the algorithm of three apertures SAR estimation radial velocities of moving targets. Then, the directions and constant tangential velocities are calculated according to the relationship of the squint angle and both radial velocities. Finally, the radial and tangential accelerations are obtained by the estimation of Doppler rate. Simulation result demonstrates that the algorithm can effectively estimate the velocity parameters of moving targets with acceleration.