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合成孔径雷达(SAR)地面动目标径向速度导致的Doppler模糊和频谱分裂会严重影响对其检测和速度估计的性能。为此,该文提出一种基于Radon变换(RT)的方法来高效准确地解决Doppler模糊和频谱分裂,实现Doppler中心和径向速度的准确估计。该方法首先基于雷达和平台参数计算目标可能模糊数对应的距离走动倾斜角,确定“模糊数-角度”对应关系;进而基于实测数据计算各先验角度RT值,搜索最大值获取模糊数。同时,提出了Doppler频谱检测器解决频谱分裂问题,可结合能量均衡法准确估计基带Doppler中心和目标径向速度。数值仿真试验结果证明了该方法的有效性。
Doppler blurring and spectral splitting caused by moving target radial velocity of Synthetic Aperture Radar (SAR) can seriously affect the performance of its detection and velocity estimation. For this reason, this paper proposes a method based on Radon transform (RT) to efficiently and accurately solve Doppler blurring and spectral splitting, and to achieve accurate estimation of Doppler center and radial velocity. In the method, firstly, the distance of the target ambiguity is calculated based on the parameters of the radar and the platform, and the corresponding relationship of “fuzzy number - angle” is determined. Based on the measured data, the transversal value of each transversal angle is calculated and the maximum value is searched for the fuzzy number . At the same time, Doppler spectrum detector is proposed to solve the problem of spectrum splitting. The Doppler center and target radial velocity can be accurately estimated by the energy balance method. Numerical simulation results show the effectiveness of the method.