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中文摘要：
针对常规SAR/GMTI系统无法获取快速目标信息的问题,提出一种基于解PRF模糊的快速目标检测和运动参数估计方法.首先将三通道SAR/GMTI数据在方位压缩后的距离频域两两对消抑制杂波,然后进行PRF模糊数估计.在方位压缩后的距离频域利用快速目标运动引起的模糊数与目标直线轨迹斜率的对应关系,通过Radon变换来搜索模糊数,同时得到目标轨迹直线斜率.已知直线斜率后进行方位徙动校正,并以最小熵准则搜索实现方位向聚焦,进而通过距离匹配滤波实现快速目标成像.仿真和实测数据结果均验证了该方法的有效性.
英文摘要：
In a conventional SAR/GMTI system,it is hard to obtain the information on the fast moving target.An approach for fast moving target indication and motion parameter estimation is proposed based on PRF ambiguity resolving.In the range frequency and compressed azimuth time domain of Tri-channel SAR/GMTI data,the clutter is cancelled by the mutual channel,and the PRF ambiguity number can be estimated from the remaining signals.This approach utilizes the relation between the line slope and the ambiguity number of the fast moving target in the domain to get the ambiguity number and thus the slope of the line through Radon transform.Azimuth focusing under the criterion of entry-minimization is implemented following effectiveness azimuth migration compensation,and the fast moving target is imaged after range match filtering.The results of simulation and real data processing show the effectiveness of the approach.
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