基于高超声速平台前斜视多通道SAR-GMTI杂波抑制方法

Multi-channel SAR-GMTI Clutter Suppression Method Based on Hypersonic Platform Forward Squint

针对高超声速(HSV)平台雷达系统,该文提出一种基于高超声速平台前斜视多通道合成孔径雷达地面动目标检测(SAR-GMTI)杂波抑制方法。该方法先进行时域距离走动校正和距离压缩,并补偿距离向通道相位误差实现距离向包络对齐;然后再对方位多普勒扩展的信号进行3阶线调频傅里叶变换(CFT)压缩,并补偿方位向通道相位误差实现方位向包络对齐;接着在距离时域-方位CFT域利用数字波束形成(DBF)技术对杂波及其模糊分量置零进行空时自适应处理(STAP),从而可以有效抑制静止杂波及其模糊分量并提取出无模糊的运动目标回波信号。

According to the HyperSonic Vehicle(HSV) borne radar platform system, a multi-channel SAR-GMTI clutter suppression method is presented based on hypersonic platform forward squint mode. First, range walk correction and range compression are completed in the time domain, and the distance envelope is aligned simultaneously with phase error compensation. Then, the Doppler extended signal is compressed by three-order azimuth Chirp Fourier Transform(CFT), and the azimuth envelope of the echo is aligned with phase error compensation simultaneously. Next, the Digital Beam Forming(DBF) technology is applied to the range timeazimuth CFT domain by nulling the clutter and its ambiguous components to achieve Space-Time Adaptive Processing(STAP). The stationary clutter and its ambiguous components can be suppressed effectively and the echo signs of the moving target without blurring can be extracted.