基于Keystone变换的多帧步进频信号处理

针对运动目标在步进帧间跨高分辨距离单元走动的问题,提出了基于Keystone变换的解决方案来补偿运动目标帧间距离走动造成的影响,并分析了利用多帧步进频信号实现运动目标距离-速度二维高分辨检测的信号处理方法及算法性能.理论分析和仿真结果表明,只要参数设计合理,该方法可以在不需要任何先验速度信息的情况下,实现运动目标的帧间相参积累,获得目标的高分辨速度和距离信息.同时,由于多帧处理有效地提高了相参积累时间,更加有利于微弱目标的检测.

Signal Processing of Multi-Frame Stepped-Frequency Radar Based on Keystone Transform

Keystone transform has been employed to remove range migration in high resolution range bins of moving targets among different stepped-frequency frames,and a new signal processing method using multi-frame stepped-frequency signals is analyzed and evaluated,with which high resolution range-velocity image of moving targets can be achieved.Theoretical analysis and simulation results showed that as long as parameters are properly designed,the method can achieve coherent integration of all moving targets between multi-frame stepped-frequency signals regardless of their unknown velocity.Moreover,thanks to great increase in coherent integration time,the capability of detecting small targets can be improved.