Abstract:

Air-borne millimeter wave high resolution synthetic aperture radar (SAR) requires high precision for motion compensation. Current motion compensation algorithm is ineffectiveness in millimeter wave high resolution squint SAR cross-track motion compensation when the motion error is serious or the squint angle is high. A refined cross-track motion compensation algorithm is proposed. The proposed algorithm first compensates envelope and phase, then produces an addition along-track velocity and the addition along-track velocity will be compensated together with the raw along-track motion error. Millimeter wave high resolution squint SAR simulation results indicate that the proposed algorithm still works well for cross-track motion compensation in 30° squint angle and the compensation results are much better than those of the existed compensation algorithms. Real data imaging results again verify the correctness and effectiveness of the proposed algorithm.