| 一种全球定位系统卫星C/A信号通道绝对时延标定算法 |
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| 引用本文： | 崔小准,米红,李懿,陈忠贵. 一种全球定位系统卫星C/A信号通道绝对时延标定算法[J]. 上海交通大学学报, 2012, 46(11): 1843-1847 |
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| 作者姓名： | 崔小准 米红 李懿 陈忠贵 |
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| 作者单位： | （中国空间技术研究院 总体部, 北京 100094） |
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| 基金项目： | 国家重大科技专项工程(DHZXO1A02004) |
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| 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.
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| 关 键 词： | 全球定位系统 卫星 C/A信号 发射通道 时延标定 |
| 收稿时间： | 2012-03-02 |
A Delay Measurement Algorithm of C/A Signal Transmission Channel for GPS Satellite |
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| CUI Xiao-zhun,MI Hong,LI Yi,CHEN Zhong-gui. A Delay Measurement Algorithm of C/A Signal Transmission Channel for GPS Satellite[J]. Journal of Shanghai Jiaotong University, 2012, 46(11): 1843-1847 |
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| Authors: | CUI Xiao-zhun MI Hong LI Yi CHEN Zhong-gui |
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| Affiliation: | （Institute of Spacecraft System Engineering, China Academy of Space Technology, Beijing 100094, China） |
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| 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. |
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| Keywords: | global positioning system （GPS） satellite coarse/acquisition signal transmission channel delay measurement |
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