基于DPCA的机载SAR-MTI系统误差分析及补偿方法研究

基于DPCA技术的机载SARMTI系统普遍存在的一个问题是:雷达平台的运动误差会导致DPCA条件不满足,从而引起系统杂波抑制性能下降.本文基于插值理论提出了一种针对该运动误差的补偿方法.本文从回波模型入手对系统误差进行分析,从理论上给出了运动补偿方法及其实现方法.该补偿方法的精度主要取决于雷达平台速度的估计精度,这个问题可以通过经典的运动参数估计方法得到很好的解决.计算机仿真结果表明,该方法能够有效补偿雷达平台的运动误差,提高SARMTI系统性能的稳定性,由于降低了对硬件系统的要求,这种方法在工程上易于实现.

System Error Analysis and Calibration Method for Airborne SAR-MTI System Based on DPCA Technique

A main problem of air borne SAR-MTI system based on DPCA technique is the performance decline of clutter suppression and moving target detection caused by the dissatisfying of DPCA condition,which is conduced by the velocity variety of radar platform.On the ground of interpolation theory,a new calibration method for this problem is presented in this paper.Based on signal model,system error is analyzed and the calibration method is provided.The key issue for the calibration precision is the accurate estimation of the velocity of radar platform,which can be obtained by conventional movement parameter estimation methods.It is demonstrated by the simulation results that the system error can be successfully removed by this method.Since the requirement to hardware instruments is reduced,this method can be easily realized in engineering practive.