中文摘要：

在弹载合成孔径雷达成像中，运动误差将对回波信号引入额外的相位调制．在宽测绘带情况下，该相位调制的大小随距离向变化，严重影响合成孔径雷达图像的聚焦．针对该问题，建立了俯冲弹道条件下的弹载合成孔径雷达运动误差模型，分析了由弹体运动误差引入的残余多普勒调频率及其对成像的影响．在此基础上提出了一种适用于宽测绘带弹载合成孔径雷达成像的运动补偿方法．该方法充分利用惯导信息并结合多普勒调频率估计，可有效地提取回波信号中沿距离向变化的残余多普勒调频率，从而补偿相应的空变相位误差．仿真结果表明，该方法能够有效地减小运动误差对聚焦的影响，并获得了较好的成像结果．

英文摘要：

In wide-swath missile-borne synthetic aperture radar （SAR） imaging, the range-variant residual phase modulation, which is introduced by the presence of trajectory deviations, will seriously degrade the focusing quality of the final image. To deal with this problem, a motion compensation approach for missile- borne SAR is proposed. In the approach, the signal model of motion error for diving movement is established. Then, according to the inertial navigation system （INS） information, the range-variant residual Doppler rates of the echoes are extracted by using the Doppler rate estimation, on the basis of which the corresponding phase error can be calculated and compensated. Simulation results show that, by using the proposed approach, the influences of the motion error on focusing are greatly reduced with the well focused image obtained.