基于道路辅助的机载SAR动目标检测和参数估计

Moving target detection and parameter estimation of airborne SAR based on road assistance

经典的合成孔径雷达(SAR)动目标检测方法无法实现地面非匀速动目标的参数估计,为解决这一问题,本文根据动目标成像的特点,提出一种基于道路信息辅助的机载双通道SAR动目标检测方法。根据双通道SAR系统空间几何模型和回波信号模型,首先采用DPCA技术实现杂波抑制和动目标的检测,然后利用道路信息确定动目标的位置和速度,最后根据动目标方位向的散焦程度,估计动目标的距离向加速度。仿真结果验证了该方法的有效性。

Traditional Synthetic Aperture Radar（SAR） moving target detection methods cannot estimate the parameters of nonconstant velocity moving targets.To solve the problem,amethod of airborne dual-channel SARmoving targets detection is presented based on road assistance and the characteristics of moving target imaging.From the spatial geometry model and echo signal of the dual-channel SAR system,Displaced Phase CenterAntenna（DPCA） technique is used firstly to suppress clutter and detectmoving targets,then the velocity and location parameters of moving targets are estimated by using road information.Finally,across-track acceleration can be computed based on azimuth defocusing of moving targets.Numerical simulations have demonstrated the effectiveness of the approach proposed.