一种新的高速运动目标成像方法

A Novel Method of ISAR Imaging for High-speed Moving Targets

提出了一种基于相位编码信号的高速运动目标逆合成孔径成像的新方法。相位编码信号在距离维和速度维具有良好的分辨力,属于多普勒敏感信号,因此在进行脉压前一般需要补偿多普勒相位。当目标高速运动时,还要考虑回波信号包络展缩的影响。研究了相位编码信号逆合成孔径成像的运动补偿方法,即采用宽带相位编码信号和窄带线性调频信号结合的方式,窄带信号用来完成目标检测和测速,宽带信号用来提高测速精度和成像。仿真结果表明该算法的有效性。

A novel method of ISAR imaging for high speed moving targets is presented in this paper. The phase-coded signal bears favorable resolution in range and velocity, however it is sensitive to Doppler frequency, and Doppler phase should be compensated before pulse compression. For the high moving target, the envelop stretch must be considered especially. A movement compensation method combining wideband phase-coded signal and narrow band linear frequency modulated signal is introduced. The narrow band signal is applied for detection and measurement, while the wideband signal for improving the speed accuracy and imaging. Simulation results prove the effectiveness of this method.