SAR运动目标距离Doppler域扩展混合积累检测

Extended hybrid integration for SAR moving target detection in range-Doppler domains

在单通道合成孔径雷达(SAR)复图像的距离Doppler域,混合积累检测可通过长时间积累提高运动目标检测性能。但当目标Doppler跨模糊数时,现有方法因目标信号分裂而导致性能严重下降。该文将距离Doppler域的Doppler频率范围扩展到地面目标最大可能Doppler范围,在扩展的Doppler频率域做距离徙动校正。运用混合积累方法实现运动目标检测。与现有方法相比,该方法可消除目标信号分裂,提高Doppler模糊运动目标的检测性能。数值试验结果证明了该方法的有效性。

In the range-Doppler domain of a single-channel synthetic aperture radar （SAR） complex image, hybrid integration can effectively detect moving targets by exploiting long-time integration. However, when the target＇s Doppler frequency cover two ambiguity integers, the target＇s signal will be split into two parts and the detection performance may be reduced. This paper presents a method to extend the target＇s range-Doppler signal to the maximum possible Doppler area to facilitate correction of the target＇s range migration. Different moving targets are then detected using this hybrid integration. The signal splitting correction strongly improves the moving target detection with different ambiguous integers compared with the existing hybrid integration method. Numerical results demonstrate the effectiveness of the method.