Journal of Systems Engineering and Electronics ›› 2009, Vol. 20 ›› Issue (5): 948-953.

• ELECTRONICS TECHNOLOGY • Previous Articles     Next Articles

Improved direct P code acquisition technique

Xu Ying1, Wang Ju2 & Wu Siliang2   

  1. 1. Academy of Opto-Electronics, Chinses Academy of Science, Beijing 100190, P. R. China;
    2. School of Information Science and Technology, Beijing Inst. of Technology, Beijing 100081, P. R. China
  • Online:2009-10-22 Published:2010-01-03


P code direct acquisition is an important technology in satellite navigation system. As the P code has a long period, it is hard to directly acquire. The traditional average method can process multiple code phases in a time to shorten the acquisition time. But with the increase of average phase error of the input signal and the local code, the correlation signal-to-noise ratio (SNR) loss increases. To reduce the SNR loss, an improved average method is introduced. A new sequence is generated with a summation of phase shifting sequences to decrease correlation peak loss. Simulation results show that compared with direct average method, the improved average method effectively increases correlation SNR.