机载相控阵雷达多分辨率成像研究

根据对相控阵天线孔径色散效应分析，设计了机载合成孔径雷达( SAR)试验系统在不同分辨率下的信号波形。针对多普勒波束锐化( DBS)模式不进行越距离单元走动校正(MTRC)和回波2次相位匹配的缺点，采用MTRC补偿和2次相位匹配滤波的方法提高了DBS的分辨率；针对斜视SAR距离走动大和距离弯曲小的特点，采用时域校距离走动、频域校距离弯曲的成像方法，并对其3次相位进行修正，有效扩大了方位聚焦深度。初步试飞结果验证了系统设计和处理方法的合理性。

Study on Multi-resolution Imaging by Airborne Phased Array Radar

The signal waveforms of airborne synthetic aperture radar(SAR) experimental system with several different resolutions were designed based on the analysis of aperture dispersive effects of phased array antennas,and the corresponding SAR imaging techniques were discussed.In the Doppler beam sharpening(DBS) mode,the migration through range resolution correction(MTRC) and quadratic phase compensation technique were used to improve DBS resolution.In the squint SAR mode,the SAR imaging scheme,including the time domain MTRC,frequency domain range curvature correction and the third phase compensation technique,was used to extend squint SAR azimuth focus depth based on the characters of bigger MTRC and smaller range curvature.The initial flying experimental data were used for system analysis,and SAR images with high quality could be obtained.The results verify the rationality of the introduced experimental system design and its imaging scheme.