舰船ISAR成像的时间段优化选取

在分析舰船逆合成孔径雷达（ISAR）成像模型的基础上提出了一种选取最优成像时间段的方法,即利用时域相关法估计不同时刻的多普勒中心,绘制出多普勒中心曲线;根据多普勒中心曲线选取合适的成像时间段,对选取的每段数据进行平动补偿,并求其方位多普勒谱;根据谱宽判断该时间段是否为最优成像时间段,如果是则利用距离-瞬时多普勒进行成像,否则丢弃该段数据。实测数据的成像结果验证了提出的方法是有效的。

Time Segment Optimization Selection of Inverse Synthetic Aperture Radar Imaging of Ship

Based on the analysis of inverse synthetic aperture radar（ISAR）imaging model of ship,this paper puts forward a method to select the time segment of optimal imaging,namely uses the time domain correlation method to estimate the Doppler centres at different time and draw up the Doppler centre curve;according to the curve to select the appropriate imaging time segment,perform the planar movement compensation to each selected segment data,and educe the azimuth Doppler spectrum;judges whether the time segment is the optimal imaging time segment on the basis of the spectrum width,if it is,then uses the distance-instantaneous Doppler to perform the imaging,otherwise eliminates the data.The imaging result of actual measurement data validates that the method is effective.