机载单天线SAR动目标检测与参数估计

Moving target indication and parameter estimation based on single-channel aeroborne SAR

对机载单天线SAR/GMTI模式下动目标参数估计精度较低的问题进行研究.首先,用多普勒频移量和距离走动量来估计动目标径向速度,根据估计的结果校正距离走动.然后,用改进的反射特性位移法来估计动目标的多普勒调频率,在不存在加速度时估计出动目标方位向速度.这样就可以在进行动目标参数估计的同时实现聚焦成像.仿真结果验证了该方法的有效性.

We have studied the low precision of parameter estimation for the moving target in airborne single antenna SAR/GMTI mode. Firstly, the Doppler shift parameter and range walk parameter are used to estimate the radical velocity of the moving target, and the range walk parameter is corrected with the estimation results. Secondly, the improved reflectivity displacement method algorithm is used to estimate the Doppler frequency rate, and the azimuth velocity can be calculated when there is no acceleration. Thus, parameter estimation and focusing imaging can be completed at the same time. Simulation results show the effectiveness of the proposed method.