首先,详细分析了调频连续波合成孔径雷达(FMCW SAR)机载试验系统,深入阐述了系统各部分的设计方法和主要原理,基于此系统进行首次校飞试验以验证系统性能;其次,深入分析了FMCW SAR回波信号特点和图像重建方法,揭示了其脉冲发射期间雷达的连续运动对回波信号的影响,定量地指出了其对图像重建的影响,并采用改进的距离多普勒算法对其补偿从而对场景进行聚焦;最后,通过实际航空校飞试验数据验证了系统分析设计和图像重建算法的有效性。

Firstly, an airborne FMCW SAR test system is designed and analyzed, and the design methods and main principles of all parts of the system are explained in-depth. Based on the system, a flight test to validate the performance was conducted. Then,the characteristics of echo signal and imaging method of FMCW SAR are analyzed, and the influence on echo signal owing to the constant movement during the pulse sweep time was revealed, and the influence on imaging was quantitatively pointed out, and the revised range Doppler imaging algorithm is used to compensated this effect. At last, the performance and validity of the system and the image reconstruction algorithm designed in this paper are verified by the real flight experiment data.

TN958