舰船电子对抗

在弹载合成孔径雷达(SAR)的应用中，目标特征点的精准位置十分重要，在匹配定位或目标识别跟踪中起到决定性作用。而图像中的每个像素的位置取决于雷达天线和地面散射单元之间的几何关系，为了更加有效利用SAR图像中的相关信息，提出了一种基于距离多普勒模型的SAR图像目标定位方法，该方法通过距离多普勒模型计算每个像素的坐标信息，并将其转换为目标点相对于雷达平台的地理坐标，进而计算目标相对于雷达的视线角，以实现导航修正。本定位方法的有效性通过模拟SAR雷达回波并进行成像处理进行验证，将距离多普勒定位方法得到的图像中目标点的位置与理论位置进行对比，验证了该方法有效性。

In the application of missile-borne synthetic aperture radar(SAR),precise localization of target feature points is crucial as it plays a decisive role in matching positioning or target recognition and tracking.The position of each pixel in the image depends on the geometric relationship between the radar antenna and the ground scattering elements.In order to more effectively utilize the relevant information in SAR images, this paper proposes a SAR image target location method based on the distance-Doppler model, uses the method to calculate the coordinate information of each pixel through the distance-Doppler model and convert it into the geographical coordinates of the target points relative to the radar platform, calculates the target's line-of-sight angle relative to the radar to achieve the navigation correction.The effectiveness of this localization method is verified by simulating SAR radar echoes and performing imaging processing.The positions of target points in the image obtained through the distance-Doppler localization method are compared with theoretical positions to validate the effectiveness of the proposed method.