摘要
针对水声信道的特点,提出了一种利用具有大的时宽带宽积的线性调频信号作为帧同步信号的方法。该方法首先在接收端进行滑动时频分析,从而实现线性调频信号的检测及粗同步,再进一步利用拷贝相关处理来实现细同步。计算机仿真和海上试验结果均表明,该方法能够在多途干扰下有效地实现同步。
Aimed at the characteristics of underwater acoustic channel, the linear frequency modulation （LFM） pulse synchronization method is proposed, which adopts LFM pulse with large time width and bandwidth product as the synchronization signal. At the receiver end, sliding time-frequency analysis is conducted, and signal detection and coarse synchronization are realized through spectrogram analysis. The accurate synchronization is further achieved by replica correlation. It is shown that this method can realize synchronization efficiently under the multi-path interference by both computer simulation and ocean experiment results.
出处
《海洋技术》
2006年第3期86-89,共4页
Ocean Technology
关键词
帧同步
线性调频
时频分析
拷贝相关
frame synchronization
linear frequency modulation （LFM）
time-frequency analysis
replica correlation
