摘要
中高频电台是船舶常规与应急通信的必备手段之一,通信双方电台一般在某个约定频率上尝试建立通信。但源于短波信道条件复杂且不稳定,存在多径干扰、信号衰落、干扰复杂等诸多不利因素,使得海事中高频电台一直存在呼叫频率选取困难、通信建立成功率低等问题。本文基于北斗卫星导航系统的精确授时功能,提出了一种基于北斗授时同步的中高频电台自动选频方法。该方法要求通信双方的中高频电台驻留在同一个预先建立的频率组内,双方电台的工作频率根据北斗授时时间同步变化,并利用双向信道探测技术完成通信双方中高频电台的呼叫频率选择,最终实现通信链路建立。假设预先建立的频率组内所有N个频率有相同的通信建立成功率,则相对于传统电台,具备自动选频功能的中高频电台的通信建立成功率可以提高N倍。
MF/HF radio is one of the necessary means of ship routine and emergency communication.Generally,both sides of the communication station try to establish communication at a certain agreed frequency.Due to the complex and unstable conditions of HF channel,there are many unfavorable factors such as multipath interference,signal fading,complex interference and so on,which make it difficult to select call frequency and low success rate of communication establishment in maritime MF/HF radio communication.This paper presents an automatic frequency selection method for MF/HF radio based on Beidou timing synchronization.This method is based on the precise timing function of Beidou Satellite Navigation System.The MF/HF radio stations of both sides of communication reside in the same pre-established frequency group,and the working frequencies of the two stations change synchronously according to Beidou timing.The two-way channel detection technology is used to complete the call frequency selection of MF/HF radio stations on both sides of the communication,and ultimately the establishment of communication links.Assuming that all N frequencies in the pre-established frequency group have the same success rate of communication establishment,the success rate of communication establishment of MF/HF radio with automatic frequency selection function can be increased by N times compared with traditional radio.
作者
周建英
杜亚琦
ZHOU Jian-ying;DU Ya-qi(No.36 Research Institute of CETC,Jiaxing 314033,China;CETC Maritime Electronics Co.,Ltd.,Ningbo 315040,China;Science and Technology on Communication Information Security Control Laboratory,Jiaxing 314033,China)
出处
《电子设计工程》
2020年第18期171-174,共4页
Electronic Design Engineering
关键词
北斗
中高频电台
授时同步
自动选频
Beidou
MF/HF radio
time synchronization
automatic frequency selection
