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In this correspondence, a novel adaptive algorithm for weak signal acquisition is proposed against the issue of weak signal acquisition under the near-far effect environment. 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 and carrier frequency are refined for the second precise acquisition, which can improve the accuracy of acquisition and Signal to Noise Ratio (SNR) of weak signal. Theoretical analysis and simulation results show that the proposed algorithm is able to weaken the influence of strong signal cross-correlation, increase the detection probability and improve the output SNR of weak signal effectively, applying to both strong and weak signal environment.

An Adaptive Algorithm for Weak Signal Acquisition under Near-far Effect