Abstract：With regarding to the issue of the accuracy of the acquisition is worse under the noise in the low Signal to Noise Ratio (SNR) environment, a two-dimensional refinement adaptive algorithm based on the pseudo-code phase and the carrier frequency is proposed. The coarse acquisition of the pseudo-code phase and the carrier frequency are completed first under larger adaptive acquisition step and threshold. On the basis of the results of acquisition, the pseudo-code phase grid and carrier frequency grid are refined for the second precise acquisition, which can improve the accuracy of the pseudo-code phase and the carrier frequency. Theoretical analysis and simulation show that the algorithm is able to enhance the resolution of captured the pseudo-code phase and the carrier frequency and effectively improve the detection probability, and can be edge option in the low SNR and high precision requirement for quick acquisition.
2014, Vol. 36 
