一种新的星载高分辨宽测绘带SAR运动目标检测与参数估计方法

A new method of moving target detection and parameter estimation for spaceborne HRWS SAR

针对星载多通道高分辨宽测绘带合成孔径雷达系统,提出了一种地面运动目标检测和参数估计方法,该方法利用空时自适应处理进行杂波抑制,采用传统SAR成像处理得到模糊的运动目标图像,接着利用恒虚警检测技术检测出所有运动目标,包括真实目标和由于多普勒模糊引起的虚假目标,再根据模糊图像的空间位置关系,从所有成像目标中检测出运动目标的真实成像位置,根据运动目标的斜距历程得到因运动目标速度引起的图像位置偏移,由此估计得到运动目标速度。该方法具有运算量小、检测精度高等优点,星载仿真数据验证了本文方法有效性。

A ground moving target indication （GMTI） method for spaceborne high resolution wide swath （HRWS） synthetic aperture radar （SAR） systems is presented. First, the space time adaptive processing was adopted for clutter suppression followed by the traditional SAR imaging which yields the ambiguous images. Then all the moving targets including the real one and ghost ones were detected by the CFAR technique, and the real one was distinguished from all the imaging targets based on the space relationship of the ambiguous images. Finally, the moving velocity was obtained according to the azimuth position shift, which could be deduced from the range history of the moving target. The advantages of the method are its low computational burden and high accuracy. The spacebome simulation data confirms its validity.