Moving Target Velocity Estimation Using Multi-Azimuth Angle Mode

Based on the multiple azimuth squint angles mode, a novel moving target velocity estimation method is proposed, including both along range and along azimuth directions. The acquisition geometry of multi-azimuth angle mode is given first with variation of antenna azimuth squint angles. Then, range curvature is corrected in range-frequency domain after range compression and the residual range curvature can be neglected which is smaller than a range bin. Furthermore, azimuth velocity is estimated by the slope variation of the range walk trajectory from two certain observations and then is the range velocity estimation based on the slope from one observation. Velocity estimation accuracy is also analyzed, considering the errors caused by azimuth squint angle and trajectory slope. The effectiveness of the proposed strategy is demonstrated by experimental results.