CAJ | 학술논문

在分析时钟误差的基础上,根据全球定位系统(GPS)秒时钟无累计误差和晶振秒时钟无随机误差的特点,提出了一种利用GPS秒时钟同步晶振秒时钟实现高精度时钟的新方法.该方法根据数字锁相原理,通过测量GPS秒时钟与晶振秒时钟间的相位差来控制晶振秒时钟的分频系数,实时消除晶振秒时钟的累计误差,从而产生高精度秒时钟.实验结果表明,在GPS正常工作时能够保证其精度稳定在20 ns;GPS信号失效1 h的情况下,秒时钟精度仍能稳定在100 ns.根据此方法研制了具有较高性价比的高精度时钟发生装置,成功应用于行波定位系统中.
재분석시종오차적기출상,근거전구정위계통(GPS)초시종무루계오차화정진초시종무수궤오차적특점,제출료일충이용GPS초시종동보정진초시종실현고정도시종적신방법.해방법근거수자쇄상원리,통과측량GPS초시종여정진초시종간적상위차래공제정진초시종적분빈계수,실시소제정진초시종적루계오차,종이산생고정도초시종.실험결과표명,재GPS정상공작시능구보증기정도은정재20 ns;GPS신호실효1 h적정황하,초시종정도잉능은정재100 ns.근거차방법연제료구유교고성개비적고정도시종발생장치,성공응용우행파정위계통중.
Based on an analysis of the errors for a clock and by taking into account the characteristic that the GPS second clock is free from cumulative errors and the crystal oscillator clock is free from random errors, a new method is proposed to implement the highly accurate clock by the synchronization of a crystal oscillator second clock with GPS second clock. According to the digital phase-lock principle, the method is used to control the frequency dividing coefficient by measuring the actual phase difference between the crystal oscillator second clock and the one pulse per second (1PPS) of GPS to eliminate the cumulative errors of the crystal oscillator second clock in real time, thereby generating the high accuracy second clock. Experimental results show, when the GPS receiver works normally, that the synchronous second clock accuracy can be maintained at 20 ns, while if the GPS signal becomes ineffective for one hour, the accuracy of the synchronous second clock can still be stabilized at 100 ns. A high accuracy clock generating device with a fairly high price performance ratio has been developed using this method and successfully applied in a traveling wave locating system.