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SHANGGUAN Wei, WANG Jing-jing, CAI Bo-gen, WANG Jian, LIANG Qian-hao. Acquisition and track algorithm of GPS weak signal[J]. Journal of Traffic and Transportation Engineering, 2010, 10(5): 108-113. doi: 10.19818/j.cnki.1671-1637.2010.05.019
Citation: SHANGGUAN Wei, WANG Jing-jing, CAI Bo-gen, WANG Jian, LIANG Qian-hao. Acquisition and track algorithm of GPS weak signal[J]. Journal of Traffic and Transportation Engineering, 2010, 10(5): 108-113. doi: 10.19818/j.cnki.1671-1637.2010.05.019
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Acquisition and track algorithm of GPS weak signal

doi: 10.19818/j.cnki.1671-1637.2010.05.019
  • 1.

    School of Electronic and Information Engineering, Beijing Jiaotong University, Beijing 100044, China

  • 2.

    State Key Laboratory of Rail Traffic Control and Safety, Beijing Jiaotong University, Beijing 100044, China

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  • Author Bio:

    SHANGGUAN Wei(1979-), male, lecturer, PhD, +86-10-51687111, wshg@bjtu.edu.cn

  • Received Date: 2010-06-24
  • Publish Date: 2010-10-25
    Abstract
  • During the design process of acquisition algorithm for GPS weak signal, in order to increase acquisition sensitivity, a method that combined coherent integration with noncoherent integration was adopted to eliminate the influence of data code length on coherent integration gain, and a differential coherent integration was proposed to reduce the square tenuation in noncoherent integration. Instead of traditional methods, FFT-based code and carrier acquisition algorithm was implemented to improve acquisition speed and accuracy. DLL and PLL were used in GPS weak signal track. Finally, the acquisition and track of GPS weak signal were realized by simulation. The result indicates that it is a good approach to track and capture GPS weak signal with the CNR of 25 dB·Hz-1 by simulation technology. The sensitivity of differential coherent acquisition is 0.8 dB larger than the sersitivity of coherent-noncoherent integration, frequency acquisition error is less than 1.25 Hz, and code acquisition error is less than 0.1 code.

     

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    • References(10)
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