Improved direct P code acquisition technique

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.