武汉电离层斜向探测系统的时间同步设计  

Design of the time synchronization for Wuhan radio ionospheric oblique sounding system

作　　者：石书祝[1] 赵正予[1] 李婷[1] 

机构地区：[1]武汉大学电子信息学院,湖北武汉430079

出　　处：《电波科学学报》2009年第6期1089-1093,共5页Chinese Journal of Radio Science

基　　金：国家自然科学基金资助项目(40474066)

摘　　要：为武汉电离层斜向探测系统设计了一种新的时间同步方式。该同步方式利用全球定位系统(GPS)接收机输出的时钟信号校正高性能恒温晶振输出的参考时钟信号,从而获得稳定可靠的秒脉冲信号来用作斜测系统的时间同步信号。在预定的探测时刻,单片机利用该信号控制斜测系统的发射端和接收端同时开始工作,从而实现时间同步。实验结果表明:该时间同步方式在获得GPS卫星信号的情况下,时间同步精度可达到30ns。而在未获得GPS卫星信号的24小时内,时间同步精度可达到1μs。在获得和一定时间内未获得GPS卫星信号的情况下,采用该时间同步方式的武汉电离层斜向探测系统都成功地获得了斜向探测电离图,从而很好地满足了探测需求。A new method of time synchronization for Wuhan radio ionospheric oblique sounding system is proposed. In this method, the clock from global positioning system （GPS） receiver was used to discipline the time reference from a high performance oven controlled crystal oscillator. Then, a stable pulse per second signal was attained to be used as the time synchronization signal for sounding system. Using this pulse per second signal, receiving and transmitting site of the system can be accurately controlled to work for time synchronization as scheduled by single chip microcomputer. Experimental results indicated that when the GPS signals were received, the timing precision of this method was about 30ns. While the GPS signals were lost during 24 hours, the timing precision of this method was about 1μs. Practical sounding observations demonstrated that whether the GPS signal was got or lost for a time, the oblique ionograms were all achieved successfully by WRIOSS with this method.

关 键 词：电离层探测 斜向探测系统 时间同步 全球定位系统 单片机 

分 类 号：TN011.2[电子电信—物理电子学]