基于宽窄变换的宽带线性调频脉冲检测和估计

基于时域压缩宽窄变换,提出一种宽带线性调频脉冲的检测与参数估计方法,避免了对宽带信号采集的根本性困难,能在负信噪比条件下实现未知参数chirp脉冲信号的检测,通过分维搜索精确地估计出调制斜率、初始频率、脉冲宽度和到达时间.初步研究了该方法的多信号处理能力,采用了小运算量方法精确定位谱峰.仿真验证了其有效性.

Detection and parameter estimation of wide-band chirp pulse based on wide-narrow transform

Based on the compression characteristic in time domain, a method for detection and parameter estimation of wide-band Chirp pulse is presented in this paper. By fractional dimension search, the Chirp rate, initial frequency, pulse width and time of arrive are estimated with relatively high accuracy at negative SNR. Furthermore, the capability of the method for dealing with multi-component signals is also discussed. The simulation reaults show that the presented method may avoid the sampling of wide-band signal, and locate spectrum peak accurately with samll computational cost.