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为了消除散布效应对宽带信号的不利影响,可以利用多个窄带信号合成宽带信号;同时,通过在子带内处理相干脉冲串,可进行杂波抑制、目标速度估计和区分不同速度的目标。然而,在子带内分别使用常规多普勒滤波器组,会引进多普勒散布效应所造成的输出失配误差,从而造成合成距离像的失真。分析了多普勒散布效应与子带常规多普勒滤波器组输出失配之间的关系,推导了运动目标通过滤波器组后所成高分辨距离像的距离走动公式,给出了适合子带常规多普勒滤波器组的目标速度临界值。仿真实验验证了以上结论。
In order to eliminate the adverse effect of dispersion effect on wideband signals, wideband signals can be synthesized by using a plurality of narrowband signals; at the same time, clutter suppression, target speed estimation and distinction of different speed targets can be performed by processing coherent pulse trains in subbands. However, the use of conventional Doppler filters in sub-bands, respectively, introduces the output mismatch error caused by the Doppler spread effect, resulting in distortion of the synthesized distance image. The relationship between the Doppler spread effect and the output mismatch of the conventional Doppler filter subbands is analyzed. The distance walk formula of the high resolution distance image obtained when the moving target passes the filter bank is deduced. Target speed threshold with normal Doppler filter banks. Simulation results verify the above conclusion.