Improved direct P code acquisition technique  

作　　者：Xu Ying Wang Ju Wu Siliang 

机构地区：[1]Academy of Opto-Electronics, Chinese Academy of Science, Beijing 100190, P. R. China [2]School of Information Science and Technology, Beijing Inst. of Technology, Beijing 100081, P. R. China

出　　处：《Journal of Systems Engineering and Electronics》2009年第5期948-953,共6页系统工程与电子技术（英文版）

摘　　要：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.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.

关 键 词：P code ACQUISITION direct average algorithm improved average algorithm. 

分 类 号：TN967.1[电子电信—信号与信息处理] P631.4[电子电信—信息与通信工程]