GNSS接收机时间管理模型的设计与实现  

Design and Realization of Time Management Model in GNSS Receiver

作　　者：曹士龙 刘根友[1] 尹翔飞 王生亮 高铭 CAO Shi-long;LIU Gen-you;YIN Xiang-fei;WANG Sheng-liang;GAO Ming(State Key Laboratory of Geodesy and Earth's Dynamics, Institute of Geodesy and Geophysics, Chinese Academy of Sciences, Wuhan 430077, China;College of Earth and Planetary Sciences, University of Chinese Academy of Sciences, Beijing 100049, China;Beijing UniAvionics Science & Technology Co., Ltd., Beijing 100093, China)

机构地区：[1]中国科学院测量与地球物理研究所大地测量与地球动力学国家重点实验室,武汉430077 [2]中国科学院大学地球与行星科学学院,北京100049 [3]北京和协航电信息科技有限公司,北京100093

出　　处：《导航定位与授时》2021年第3期146-152,共7页Navigation Positioning and Timing

基　　金：国家重点研发计划项目(2016YFB0501900);国家自然科学基金(41774017,41621091)。

摘　　要：为了满足卫星接收机对多个时间系统统一管理的需求,设计了一种适用于多系统GNSS接收机的时间管理模型,用于维持和处理接收机内部时间。详述了接收机时间初始化、维持、钟差估计的方法与修正策略。基于DSP6671平台对模型进行了实验验证,并分析了不同定位模式下的钟差变化特性,以及两种钟差调整策略对伪距、载波相位的非差和双差的影响。实验结果表明该模型可通过两种方式修正接收机钟差,且对双差载波相位观测值不产生影响;能有效估计出顾及接收机端硬件时延的钟差。实验中,GPS、GLONASS和BDS三种模式下的钟差均值分别为-30.7ns、-72.6ns和-109.1ns。In order to meet the requirements of unified management of multiple time systems,a time management model suitable for multi-system GNSS receiver is designed in this paper to maintain and process the internal time of the receiver.The methods of receiver time initialization,maintenance,clock offset estimation and correction strategy are described in detail.Based on DSP6671 platform,the model is verified by experiment,and the variation characteristics of clock offset under different positioning modes are analyzed,as well as the effects of two clock offset adjustment strategies on pseudorange,zero-difference and double-difference of carrier phase.The experimental results show that the model can modify the receiver clock offset in two ways,and it has no effect on the observed double-difference carrier phase.It can effectively estimate the clock bias taking into account the hardware delay of the receiver.In the experiment,the average clock offsets of GPS,GLONASS and BDS are-30.7ns,-72.6ns and-109.1ns,respectively.

关 键 词：GNSS 时间模型 钟差 毫秒钟跳 

分 类 号：TN965.5[电子电信—信号与信息处理]