短波跳时跳频信号的同步技术研究

Research on Synchronization Technology of HF TH-FH Signal

短波跳时跳频信号同步是抑制短波跳时跳频信号应用的主要问题,通过对现有的同步头加TOD信息的帧头结构进行改进,给出一种较快高效的同步方法,分析计算其在高斯白噪声信道下并且存在部分频带干扰的情况下的性能,用MATLAB对其性能进行仿真,最后提出一种去掉TOD信息、同步头与跳时PN码和跳频PN码为一一对应关系的帧头结构,采用基于滑动窗相关检测的方法对信号进行帧同步检测。

The synchronization of shortwave TH-FH signal is a primary problem that restrains the application of shortwave TH-FH signal. The improvement of synchronization information structure of current frame that contains frame head and TOD brings forward a faster and higherefficiency method. This paper analyzes and calculates the performances when signal transmits in the channel of AWGN with jamming in some frequency bands, simulates the performances by using the MATLAB, and designs a kind of synchronization information structure of frame without TOD and with one-to-one correspondence between the head of frame and TH PN code and FH PN code. The detection method based on sliding block is used to implement frame synchronous detection for the shortwave TH-FH signals.