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对脉组间频率步进信号进行信号处理可直接获得合成超宽带(UWB)距离像及目标速度信息,但由于多普勒色散引入的快速傅里叶变换(FFT)输出失配误差和距离多普勒耦合,导致距离像的失真。介绍消除多普勒色散的影响的方法,分析且补偿距离多普勒耦合对距离像的影响,进一步讨论由测速误差产生的补偿量化误差对距离像的影响,并推导由此导致的距离走动公式。提出的迭代二分逼近法使速度分辨提高N倍(N为脉组个数),从而得到目标真实高分辨距离像。仿真实验结果表明多普勒色散得到消除且N的选取更加灵活。
Signal processing of the frequency step signal between pulse groups can directly obtain the UWB distance image and the target velocity information, but because of the output mismatch error and the distance of the fast Fourier transform (FFT) introduced by Doppler dispersion, Polarized coupling, resulting in distance image distortion. The influence of Doppler dispersion on distance image is analyzed and compensated. The influence of compensation quantization error caused by velocity error on distance image is further discussed, and the resulting distance walk formula . The proposed iterative dichotomy approach improves the speed resolution by N times (N is the number of the pulse train), so that the target real high-resolution range image can be obtained. Simulation results show that Doppler dispersion is eliminated and N is more flexible.