适用于非合作发射源的合成孔径雷达无源成像方法

 合成孔径雷达(SAR)具有突出的高分辨率成像能力,在民用和军用领域体现出重要的应用价值。在复杂的作战环境中,提高SAR的电子对抗性能成为SAR技术发展考虑的重要方面。提出一种新的SAR无源成像方法,该成像方法将单部机载SAR接收机或多部机载SAR接收机在不同位置处接收到的回波信号相关,对相关后的信号采用滤波反投影方法进行成像,可重建场景的辐射率。该成像方法不需要已知发射源的波形和位置信息,适用于非合作发射源,具有良好的电子对抗性,并且适用于任意载机飞行轨迹、多基SAR等情形。仿真验证以双基情形为例,验证了该SAR无源成像方法的有效性,并分析了影响成像质量的各关键因素。

A Passive Synthetic Aperture Radar Imaging Method for Non-cooperative Transmitters

Synthetic aperture radar (SAR) with the feature of high resolution imaging is of considerable significance in both civil and military applications. With the increasing complexity of the battle environment, to improve SAR electronic counter performance becomes one of the most important concerns in the development of SAR technology. This paper presents a novel passive SAR imaging method, which first correlates the received signals at a single SAR receiver or multiple SAR receivers, and then reconstructs the scene radiance by developing a filtered-back-projection technology based on this correlation signal model. The method does not require a priori information of the transmitted waveform and the location of the transmitters, which makes it applicable to the case of non-cooperative transmitters. It is also applicable to arbitrary flight trajectories and multistatic SAR. The paper discusses the imaging in the framework of a bistatic SAR, where it demonstrates the effectiveness of the proposed passive SAR imaging method, and analyzes the main factors that influence the quality of the reconstructed image.