BPL时号定时校准原理和方法  

Principle and method for timing calibration of BPL time signal

作　　者：车爱霞[1] 

机构地区：[1]中国科学院国家授时中心,西安710600

出　　处：《时间频率学报》2011年第1期23-26,共4页Journal of Time and Frequency

基　　金：中国科学院大科学装置维修改造项目

摘　　要：为保证BPL长波授时时号(以国家授时中心(NTSC)保持的UTC(NTSC)为基准)的准确度,必须对该时号进行定时校准(确定发射时号与发播工作钟同步时定时校准信号的相位)。阐述了定时校准的原理和方法。与传统罗兰-C系统校准方法不同,该方法选择发射天线电流取样信号基准过零点而非定时控制单元基本定时信号为定时校准点,消除了因锁相控制精度不足引起的误差,提高了时号精度。该方法可以作为罗兰-C授时系统的通用校准方法。In order to guarantee the accuracy of BPL time signal,which is referred to UTC（NTSC） kept by the National Time Service Center（NTSC）,it is necessary to calibrate the time signal,i.e.,to determine the phase of timing calibration signal while the transmitted time signal is synchronized with the working clock for transmission.The principle and method for calibrating BPL time signal are demonstrated.Differing from the conventional calibration method,the standard zero crossing of the emission antenna current signal,instead of the basic timing signal of the timing control unit,is selected to calibrate the time signal in this method,so that the error caused by the deficiency of the accuracy of phase-locked control loop is eliminated and the precision of BPL time signal is improved.This method could be used as a general method for time signal calibration of Loran-C system.

关 键 词：BPL时号 定时校准 时号改正数 

分 类 号：P127.1[天文地球—天体测量]