摘要
为实现局域无线时间同步系统多个时钟的同步,达到时间同步高精度的需求,基于双向伪码测距原理对伪码测距环路进行了跟踪精度的性能优化分析。首先通过分析局域无线时间同步系统下跟踪环路传统的实现结构,利用无电文调制的导频通道辅助数据通道的跟踪结构来优化环路。其次在给出影响码跟踪环测量误差的基础上,对环路的参数进行了分析与优化。最后结果表明双通道辅助跟踪结构,有助于增加跟踪积分时间,减小跟踪误差。同时低动态环路下载噪比的提高与窄环路带宽的减小均可减少码跟踪环的测量误差,从而提高跟踪精度和时间同步的精度。
In order to realize the local wireless time synchronization system and achieve the requirement of high precision for the time synchronization, this study optimized the tracking accuracy of the pseudo-code ranging loop based on the principle of bidirectional pseudo-code ranging. Firstly, the traditional implementation structure of the tracking loop in local wireless time synchronization system was analyzed, then the tracking signal structure of the auxiliary signal channel was optimized by the pilot signal channel without the message modulation to optimize the tracking loop structure. Secondly, based on the measurement error of the influence code tracking loop, the parameters of the loop which combined with the wireless time synchronization system were analyzed and optimized. The final results shown that the dual-channel auxiliary tracking algorithm was helpful to increase the tracking integration time and reduce the tracking error. The improvement of the static loop downloading noise ratio and the narrow loop bandwidth can decrease the measurement error of the code tracking loop, thus the tracking accuracy and the precision of time synchronization can be improved.
作者
湛小蕾
刘音华
张慧君
李孝辉
ZHAN Xiao-lei;LIU Yin-hud;ZHANG Hui-jun;LI Xiao-hui(National Time Service Center,Chinese Academy of Sciences,Xi'an 710600,China;Key Laboratory of Time and Frequency Primary Standards,Chinese Academy of Sciences,Xi'an 710600,China;University of Chinese Academy of Sciences,Beijing 100049,China;School of Astronomy and Space Science,University of Chinese Academy of Sciences,Beijing 101048,China)
出处
《时间频率学报》
CSCD
2019年第4期292-300,共9页
Journal of Time and Frequency
基金
中国科学院“西部之光”人才培养计划西部青年学者资助项目（XAB2016A05）
关键词
无线时间同步
双向伪码测距
双通道辅助跟踪
跟踪精度
跟踪误差
wireless time synchronization
two-way pseudo-code ranging
two-channel auxiliary tracking
tracking accuracy
tracking error
