基于时域分割的DS/FH信号参数估计

Parameter Estimation of DS/FH Signals Based on Temporal Segmentation

针对时频分析方法在直扩/跳频(DS/FH)混合扩频信号参数估计中存在时频分辨率受限、交叉项干扰、实时性差等缺点,通过分析DS/FH信号的时频特性,提出了一种新的DS/FH信号参数估计方法。该方法从待测信号的时域分析出发,利用不同跳频点对应的周期数不相等的性质,完成了对DS/FH信号的时域分割,最后结合DS/FH信号性质完成了对待测信号跳频周期、驻留时间、跳频频率的估计。仿真结果表明,该方法针对DS/FH信号的参数估计精度高,运算速度较快,且没有干扰频率。

In order to avoid the shortcomings such as the limited time-frequency resolution,redundant cross terms and poor real-time in using the time-frequency distribution to estimate the DS/FH（Direct Sequence/Frequency Hopping） signal parameters,a new parameter estimation method that takes the time domain analysis as a starting point is presented through analyzing the time-frequency characteristics of DS/FH signal.Based on time domain analysis of the test signal,the method divides the DS/FH signal in the time domain because the different frequency signals have different number of cycles.Then,it completes estimation of the parameters such as hopping period,dwell time,and hopping frequency.The experimental results show that the method is extremely effective for DS/FH signal.Apart from that,it features high estimation accuracy,fast operation and no interference frequency.