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A Two-dimensional Refinement Algorithm for Signal Acquisition |
He Zhi-li①② Xu Ying② Yuan Hong② Wei Dong-yan② |
①(Academy of Opto-Electronics, Chinese Academy of Sciences, Beijing 100094, China)
②(University of Chinese Academy of Sciences, Beijing 100049, China) |
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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.
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Received: 30 August 2013
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Corresponding Authors:
Xu Ying
E-mail: nadinexy@aoe.ac.cn
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