Improved direct P code acquisition technique |
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Authors: | Xu Ying Wang Ju Wu Siliang |
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Institution: | 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 |
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Abstract: | 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. |
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Keywords: | P code acquisition direct average algorithm improved average algorithm |
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