上海交通大学学报

上海交通大学学报（自然版） ›› 2012, Vol. 46 ›› Issue (11): 1843-1847.

• 无线电电子学、电信技术 • 上一篇    下一篇

一种全球定位系统卫星C/A信号通道绝对时延标定算法

崔小准,米红,李懿,陈忠贵   

  1. （中国空间技术研究院 总体部, 北京 100094）
  • 收稿日期:2012-03-02 出版日期:2012-11-30 发布日期:2012-11-30
  • 基金资助:

    国家重大科技专项工程(DHZXO1A02004)

A Delay Measurement Algorithm of C/A Signal Transmission Channel for GPS Satellite

 CUI  Xiao-Zhun, MI  Hong, LI  Yi, CHEN  Zhong-Gui   

  1. （Institute of Spacecraft System Engineering, China Academy of Space Technology,  Beijing 100094, China）
  • Received:2012-03-02 Online:2012-11-30 Published:2012-11-30

摘要：   为了精密测量全球定位系统（GPS）卫星C/A（Coarse/Acquisition）信号发射通道时延，提出了一种采用数字信号处理技术的标定算法.对GPS卫星输出的C/A导航信号和时间保持系统的Z计数脉冲进行双通道同步采样，在数字域完成C/A信号预处理后，进行多速率数字信号处理，获取C/A信号中伪随机码起始点；结合Z计数脉冲信号样本数据的处理结果，计算得到C/A信号发射通道的绝对时延.采样率为10 GHz时算法标定结果的不确定度低于0.2 ns.

   

关键词: 全球定位系统, 卫星, C/A信号, 发射通道, 时延标定

Abstract: The delay measurement accuracy of the transmission channel directly affects GPS users’ positioning precision and time transfer accuracy of GPS. To measure delay of C/A (Coarse/Acquisition）signal transmission channel high accurately, a delay measurement algorithm based on DSP (Digital Signal Processing) was introduced. The C/A signal and the pulse of Z counter of time keeping system on GPS satellite are sampling in synchronization. After C/A signal data pre-processed, multi-rate digital processing is made to decide the start point of PRN (Pseudorandom noise) code of C/A signal. With the processing results of Z pulse signal data, the delay of C/A signal channel is calculated out. The measurement uncertainty with the proposed algorithm is less than 0.2 ns when the sampling frequency is 10 Gsa/s.  

Key words: global positioning system （GPS）, satellite, coarse/acquisition signal, transmission channel, delay measurement

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