低信噪比环境下的长码捕获新算法

doi:10.3969/j.issn.1001-2400.2013.04.005

Abstract

Abstract:

Focusing on the problem of low acquisition probability in the weak Satellite Navigation Position Systems signals environment, we propose an algorithm which can improve its acquisition signal-to-noise ratio (SNR) with multiple codes accumulation. The algorithm realizes codes coherent and incoherent accumulation by multiplexing the PMF-FFT(Partial Matched Filtering-Fast Fourier Transform)cell, which can lead to a longer accumulation time and more coherent accumulation gain. Thus, it increases the capture sensitivity, shortens the capture time, and reduces the interference. Simulation shows that the algorithm in this paper can obviously improve the system's capture performance. It is better than the conventional PMF-FFT algorithm by close to 4dB under the same SNR. The algorithm can be applied to the capture design in the second generation of COMPASS Navigation Satellite System.

Key words: capture, high sensitivity, partial matched filtering, high dynamic, global positioning system

LI Wengang;HUANG Xinlei;LIU Longwei. New acquisition scheme with high sensitivity for long code[J].J4, 2013, 40(4): 29-36.

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New acquisition scheme with high sensitivity for long code

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