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GPS软件接收机中C/A码信号捕获的圆周相关算法

关止1,2, 赵凯1, 宋冬生1,2   

  1. (1. 中国科学院 东北地理与农业生态研究所, 长春 130012; 2. 中国科学院 研究生院, 北京 100049)
  • 收稿日期:2005-10-12 修回日期:1900-01-01 出版日期:2006-03-26 发布日期:2006-03-26
  • 通讯作者: 赵凯

Circular Correlation Algorithm of Acquiring C/A Code Signals in GPS Software Receiver

GUAN Zhi1,2, ZHAO Kai1, SONG Dong-sheng1,2   

  1. (1. Northeast Institute of Geography and Agricultural Ecology, CAS, Changchun 130012, China; 2. Graduate School of the Chinese Academy of Sciences, Beijing 100049, China)
  • Received:2005-10-12 Revised:1900-01-01 Online:2006-03-26 Published:2006-03-26
  • Contact: ZHAO Kai

摘要: 采用圆周相关算法实现全球卫星定位系统(GPS)C/A码信号的捕获. 该算法用快速傅立叶变换将输入数据和本地产生的数据变换到频率域, 在频率域进行二者的圆周相关处理, 对相关结果反变换并找到其最大绝对值, 将该值与预先设定的门限值比较, 如果大于门限值, 则信号捕获成功. 圆周相关算法可实现快速获取GPS C/A码信号, 且灵敏度较高.

关键词: C/A码信号捕获, 快速傅立叶变换, 圆周卷积

Abstract: The circular correlation algorithm can be used for acquiring Global Positioning System (GPS) C/A code signals. In the algorithm, the input data and the local code were converted into the frequency domain by means of Fast Fourier Transform (FFT) on input data and local code, where their correlation processing can be carried out. After taking the inverse FFT, the maximum absolute value can be found. The value is compared with predetermined threshold. If the value is higher than the threshold, the signals are acquired successfully. This correlation algorithm opens a new way for acquisition of GPS C/A code signals rapidly and accurately.

Key words: acquisition of GPS C/A code signals, fast Fourier transform, circular convolution

中图分类号: 

  • TP301.6