基于Radon-Wigner变换的多运动目标成像

Imaging of multiple moving targets based on Radon-Wigner transform

针对逆合成孔径雷达波束内多个平稳飞行目标在距离上重叠的情况探讨多运动目标成像。首先建立多目标回波模型,由分析得出某一目标的回波在一个距离门内对应一组线性调频信号、信号参数在不同距离门内呈规律性变化的结论。据此提出一种基于Radon-Wigner变换(RWT)对多目标信号进行参数估计及分离的多目标成像算法。仿真结果说明了该方法的有效性。

The imaging of multiple targets in the same antenna beam which can not be separated in range is discussed. Firstly signal model for multiple targets is obtained via theoretically analysis. Then the conclusion that the signals of a certain target in a range bin correspond to a batch of multi-component LFM signals with their parameters changing among different range bins is given. Finally an algorithm based on Radon-Wigner transform （RWT）is proposed to estimate parameters and to separate signals of different targets. Simulation results validate the effectiveness of the proposed algorithm.