基于S变换的混合DS/FH扩频信号参数估计  

Parameter estimation of hybrid DS/FH spread spectrum signals based on the S transform

作　　者：朱明哲 姬红兵[1] 

机构地区：[1]西安电子科技大学电子工程学院,陕西西安710071

出　　处：《西安电子科技大学学报》2010年第4期710-715,750,共7页Journal of Xidian University

基　　金：863创新基金资助项目;深圳市ATR重点实验室开放基金资助项目(081052)

摘　　要：针对混合二相编码调制的混合扩频信号的参数估计问题,提出了一种基于S变换的跳频参数估计方法.该方法利用非线性变换获得携带跳频信息的参考信号,并利用循环谱估计该信号的频率集作为修正信息;在S变换中引入高斯窗长控制参数以实现其时频分辨率的可控性.在此基础上,提取修正S变换时频脊线作为对参考信号瞬时频率的估计;利用修正信息降低脊线高频区域的误差,同时抑制噪声对参数估计精度的影响.仿真实验表明了该算法对跳频参数估计的有效性.算法无需信号的先验知识,并易于通信侦测接收机的实现.This paper addresses a new method for parameter estimation of hybrid DS/FH_BPSK signals based on a time-frequency（TF） technique known as the S transform（ST）.Good performance is achieved by three stages.Firstly,a nonlinear process is used to produce the reference signal（RFS） which has the same hop parameter as the original signal and its frequencies could be estimated by the cyclic spectrum as the modification information.Then the S transform is improved by adding a Gaussian window width parameter to realize the adaptation of its time-frequency resolution and the ridge curve of ST is extracted as the instantaneous frequency of RFS.Finally,the modification information is used to reduce the estimation error in the high frequency region caused by noise.Simulation results show that the proposed method can operate effectively for hop parameter estimation.Since no prior knowledge of signals is needed,the proposed method is easily implemented in a reconnaissance receiver.

关 键 词：通信对抗 混合扩频 S变换 参数估计 

分 类 号：TN911.7[电子电信—通信与信息系统]