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| A Delay Measurement Algorithm of C/A Signal Transmission Channel for GPS Satellite |
| CUI Xiao-Zhun, MI Hong, LI Yi, CHEN Zhong-Gui |
| （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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Received: 02 March 2012
Published: 30 November 2012
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