针对调频连续波合成孔径雷达在高速运动中收发信号的情况,运用一种精确的多普勒回波模型,推导说明了直接通过傅里叶变换距离压缩的谱峰不仅发生多普勒偏移,同时存在展宽和峰值下降现象。给出了补偿函数,能够去除多普勒偏移和距离徙动的影响,并进一步压缩距离响应,提高距离分辨率。仿真实验证明文中算法正确有效。

Based on the situation that frequency modulation continuous wave synthesis aperture radar transmits and receives signals on the platform with high-speed motion, this paper proposes an exact Doppler echo model, and proves that spectral peak obtained directly from range compression according to Fourier transform is shifted, even stretched and deteriorated due to radar motion. Focusing on the above problems, two novel functions are used to compensate Doppler frequency-shift, range migration,and to further accumulate energy. Thus the improvement of range resolution is achieved. Simulation test proved the validity and reliability of the proposed method.

TN958.94