SAR imaging method

The invention proposes an SAR imaging method, and the method comprises the steps: carrying out the collection of SAR data, range direction compensation, azimuth frequency domain high-order term compensation, azimuth frequency domain high-order phase filtering, azimuth time domain high-order term compensation and azimuth inclination correction, and obtaining an image after focusing. The method is used for aperture data processing, gives consideration to the frequency modulation rate space variant caused by the range envelope and azimuth target position at the same time on the basis of the high-order approximate two-dimensional spectrum, employs a frequency domain high-order phase filtering method for solving, effectively improves the imaging speed, and can meet the requirements of real-timeimaging on the basis that the imaging precision is guaranteed. 本发明提出种SAR成像方法，通过对SAR数据进行校正、距离向补偿、方位频域高次项补偿、方位频域高次相位滤波、方位时域高次项补偿和方位倾斜校正等得到聚焦后的图像。本发明针对子孔径数据处理，在高阶近似二维谱的基础上，同时考虑距离包络和方位目标位置引入的调频率空变，并采用频域高次相位滤波的方法加以解决，有效地提高了成像速度，在