Signal acquisition is the first work of signal processing in Global Positioning System receiver.However

it is difficult to get the accuracy and fast acquisition of the GPS signal by traditional methods when the signal is very weak.The paper presented a new method which applies the technology of acquisition of P(Y) code in the acquisition of C/A code

and gives resolutions account for the problems brought from the data spanning multiple data bits.The simulation results show that

signal which carrier noise ratio is low to 15dB-Hz could be well acquired by the new method

with fast acquisition speed and high sensitivity.