详细探讨了合成孔径雷达中运动目标的检测问题，根据机载合成孔径雷达运动目标回波信号的特点，提出了基于Radon-Ambiguity变换和解调频技术的一种新的机载运动目标检测方法，给出了动目标检测、参数估计的主要步骤，分析了在单目标和多目标情况下的检测性能。该方法与常用的Wigner-Ville分布和Radon变换结合的方法相比计算量明显减少，在多目标情况下能够较好地抑制交叉项，提高检测性能。且使用解调频技术与RAT相配合，解决了单纯RAT无法估计Chirp信号初始频率的问题。仿真试验结果证明了算法的有效性。

This paper discusses the problem of moving targets of Synthetic Aperture Radar (SAR). According to the characteristics of airborne SAR moving target returns, a new SAR moving target detection method based on Radon-Ambiguity transform and frequency demodulation technique is proposed. It points the step of the MTD and the parameter estimation and analyses the detection capability for a single target and multi-targets. Comparing with the common method based on Wigner-Ville distribution, this algorithm has less computation load, suppress the cross-terms and improve the detection capability. The problem of estimating the initial frequency of the Chirp signal simply by the RAT method can be solved too. The simulation results proves the validity of the algorithm.

TN958