基于滑动窗口的高分辨率SAR图像点目标积分响应能量计算方法研究

Method for Point Target Integral Response Energy Calculation in High Resolution SAR Image based on Sliding Window

合成孔径雷达(Synthetic Aperture Radar,SAR)辐射定标是SAR定量化应用的基础,点目标积分响应能量计算是SAR图像辐射定标的重要内容。为优化高分辨率SAR系统辐射定标方法,本文根据积分法能量计算模型,引入图像上下文信息,提出了一种基于滑动窗口的高分辨率SAR图像点目标响应能量计算方法,并利用新舟60遥感飞机获取的机载SAR数据进行验证。结果表明,该方法能够减少SAR图像中背景杂波、斑点噪声以及地面点目标指向误差对点目标位置选取的干扰,提高点目标位置选取精度,基于图像计算得到的积分响应能量与点目标理论值更接近,因此该方法可以使高分辨率SAR系统取得更高的辐射定标计算精度。

Synthetic Aperture Radar(SAR)radiometric calibration is the basis of SAR quantitative applications,and the calculation of the integral response energy of point targets is an important part of SAR radiometric calibration.In order to optimize the radiometric calibration method of high-resolution SAR system,according to the energy calculation model of integral method and the introduction of image context information,this paper proposes a calculation method of point target response energy of high-resolution SAR image based on the sliding window,which is verified by the airborne SAR data obtained by Xinzhou 60 remote sensing aircraft.The results show that the method can reduce the interference of background clutter,speckle noise and ground point target pointing error in SAR images on point target position selection,improve point target position selection accuracy,and the integral response energy obtained based on images is closer to the theoretical value of point target.Therefore,the method can enable the high-resolution SAR system to achieve higher radiometric calibration calculation accuracy.