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A Novel Acquisition Scheme for a GPS Software Receiver Based on Two Stand-Alone One-Dimensional Search Processes

  • Zhiguo Liu
  • Dacheng Luo
  • Shicheng Wang
  • Zhanxin Cheng
  • Lihua Chen
Conference paper
Part of the Advances in Intelligent Systems and Computing book series (AISC, volume 215)

Abstract

To improve the capturing speed of a GPS software receiver, a novel acquisition scheme is presented. First, by compensating the frequency of the intermediate frequency signal to improve its cyclicity, the signal-to-noise ratio (SNR) of the intermediate frequency signal can be improved by using coherent average algorithm. Second, the C/A code start of every satellite is searched through the delay−multiply configuration, then the delay and accumulation unit is put forward to pretreat the multi-frequency signals. Lastly, the separation and estimation of Doppler-shift components are fulfilled by frequency domain analysis on post-treatment signals; therefore, the two-dimensional searching process in conventional acquisition scheme is transformed into two one-dimensional searching processes in the proposed acquisition scheme. In the proposed acquisition scheme, a shorted fast Fourier transform (FFT) version is adopted, which can greatly reduce the computation burden without degradation on performance. Sampled data from GPS receiver and simulated GPS signals are used for simulation experiments. Simulation results indicate that the proposed acquisition scheme is an effective one by much decreasing the acquisition time.

Keywords

GPS software receiver Signal acquisition Two-dimensional searching Doppler frequency 

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Copyright information

© Springer-Verlag Berlin Heidelberg 2014

Authors and Affiliations

  • Zhiguo Liu
    • 1
  • Dacheng Luo
    • 1
  • Shicheng Wang
    • 1
  • Zhanxin Cheng
    • 1
  • Lihua Chen
    • 1
  1. 1.Xi’an Research Institute of High-techXi’anChina

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