一种非合作的跳频信号跳同步方法

A Non-Cooperative Synchronization Method of Frequency Hopping Signal

针对跳频信号侦察中，在非合作条件下进行信号跳同步问题，提出利用跳信号分段频谱比较分析实现跳频信号跳变时刻同步的方法。该方法首先利用短时傅里叶变换和小波变换的方法有效估计跳频信号跳速率参数，在此基础上通过在一个跳周期内取三段信号进行频谱比较，并滑动调整时间参数的方法进行跳同步获取。实验证明该方法不仅可以有效实现跳频的跳同步，同时克服了跳速率估计精度不足的问题，且方法结构简单易于工程实现。

To aim at non-cooperative hopping time synchronization in frequency hopping communication reconnaissance, a method using segmental spectral analysis to signal of one hop duration is proposed. In this method the hop rate is first estimated by using short-time Fourier transform and wavelet transform. And then adjust the hopping time according to the result of comparing the spectrum of three segments signal in one hop duration. The experimental result shows that the proposed method can accomplish hopping time synchronization efficiently and can overcome the inaccurate estimation of hop rate. And the proposed method is easy to engineering implementation.