基于合成带宽提高距离分辨率的改进方法

摘要

Synthesizing range profile by multi-band sub-pulse signal can reduce the instantaneous bandwidth of the system as well as the sampling rate requirement of the signal.On the basis of the original fusion sub-bandwidth using synthetic bandwidth technology,this paper adopts Gaussian interpolation to reconstruct the signal,which can obtain a higher resolution range image.Compared the Gaussian interpolation with the Sinc interpolation in the speed of operation,it is concluded that the Gaussian interpolation model is superior to the Sinc interpolation model in the computation speed.Simulation results show that this method can not only solve the problem of sub-pulse synthesis with different parameters,but also can effectively improve the range resolution,and even reduce the computation time compared with Sinc interpolation.%多频段子脉冲信号合成距离像,可以降低系统的瞬时带宽以及信号的采样率要求,并且提高距离分辨率.在原有基于合成带宽技术的融合子带基础上,采用高斯插值对融合后信号进行均匀化处理,获得了更高分辨率的距离像.在运算速度上将高斯插值与辛格插值进行比较,最终得出高斯插值模型在运算速度上优于辛格插值模型.仿真实验表明,此方法不仅能够解决不同参数的子脉冲合成问题,还能有效地改善距离分辨率,并且对比辛格插值还能减少运算时间.