卫星同步时钟的设计  

Design of the satellite synchronized clock

作　　者：宣宗强[1] 孙小莉[1] 刘晨[1] 康婧婧[1] 

机构地区：[1]西安电子科技大学机电工程学院,陕西西安710071

出　　处：《西安电子科技大学学报》2013年第4期125-129,共5页Journal of Xidian University

基　　金：国家自然科学基金资助项目(10978017;61201288)

摘　　要：介绍一种基于TDC-GP2芯片测量时间间隔的新型全球定位系统——北斗锁定二级频标系统.给出了系统的总体设计方案、软硬件设计方法,运用卡尔曼滤波算法并结合线性平均的方法对噪声进行估计、滤波,采用ACAM公司生产的通用型TDC-GP2芯片对卫星锁定二级频标系统的时间间隔进行测量,通过增加一路分频输出信号,使测量范围扩展到-3.25～+3.25ms,时间分辨达到50ps.实验结果表明,锁定时输出频率准确度优于10-12(24h平均值),频率稳定度优于10-11/s.与传统的频标锁定系统相比,具有电路简单、调试方便、测量范围宽、附加噪声小、精度高等优点.This paper introduces a system for a new type of GPS/the Beidou locking second-class frequency standard of measuring time intervals based on the TDC-GP2 Chip. It also presents the overall design scheme for the system, develops the hardware and software frame, and implements the Kalman filter algorithm combined with the method of linear average for estimating and filtering noise. The universal TDC-GP2 produced by the ACAM company for measuring time interval of locked second-class frequency standard system is used by the satellite. By increasing another dividing frequency output signal 1PPS2, the measurement range is extended to -3.25～＋3. 25ms and the time resolution of 50ps is obtained. Experimental results show that the system＇s locked output frequency accuracy is as high as 10^-12 （24-hour average）. Frequency stability is better than 10^-11/s. Compared with the traditional frequency standard locked system, the system has the advantages of simple circuit, convenient adjustment, wide measurement range, small additional noise, and high precision.

关 键 词：频标锁定系统 TDC-GP2芯片 全球定位系统 卡尔曼滤波 

分 类 号：TM935.11[电气工程—电力电子与电力传动]