舰船目标实测数据ISAR成像分析

The ISAR imaging analysis of the real data of ship target

采用逆合成孔径雷达对海上舰船目标进行一维成像和二维成像研究。海上舰船目标的一维距离像通过对各次回波的dechirp数据直接进行傅立叶变换得到。二维成像需要对相邻回波用相邻相关法对其相关系数进行分析,由分布情况找出并剔除不正常回波,然后对各次回波进行运动补偿,包括包络对齐和自聚焦两步,最后分析各距离单元的时频分布情况,按照结果对数据进行分析、处理,得到舰船目标的二维图像。由Matlab仿真结果对得出的分析结果进行了检验。

Study of the ISAR imaging of the ship target at sea was given,including one-dimensional imaging and two-dimensional imaging. The one-dimensional imaging was gotten through FFT of the dechirp data in real directly. And the two-dimensional imaging needed finding the abnormal echoes and eliminating them. These were based on analysis of the distribution of the coherent coefficient. Then each echo was given motion compensation,including range alignment and autofocus. Based on the analysis of time-frequency distribution, the real data was analyzed and disposed. Then the two-dimensional imaging of ship target was gotten. Finally, the simulation results were given the validation of the method.