一种新的宽带跳频信号时延估计方法及精度分析

A New Time Delay Estimate Method of Wide-band FH Signal and Precision Analysis

随着跳频信号的广泛应用,对其时延估计也日趋重要,其难度也越来越大,但目前建立的模型一般为窄带模型,且估计精度受采样时间间隔的限制,针对此问题,本文研究了一种跳频信号的新时延估计方法。该方法充分利用跳频信号特征,提取参考频率点处的相位差,利用相位差与时延的关系估计跳频信号的时延。仿真实验表明该方法的估计精度不直接受采样时间间隔的影响,可达到皮秒量级。该方法也适用于估计其它频域信息丰富的信号时延,且易于工程实现。

In present time delay estimation methods of FH signal, the problems like the models are narrowband model and the precision is confined by the sampling interval are widely exist. For this, a new method which used the phase difference in reference fre- quencies based on the characteristic of FH signal is proposed in this paper. It estimates FH signal＇ s time delay by the relation between phase difference and time delay. According to the result of experiments, this method isn＇ t confined by the sampling distance directly and the precision can reach peel seconds. Especially, it can also be used in other signals which have abundant information in frequency and easy implemented in engineering.