A weak signal acquisition method for BeiDou GEO satellite

Abstract

Abstract:

The D2 navigation data broadcast by the BeiDou geostationary earth orbit (GEO) satellite may change every 2 ms.In weak signal environment, the usual acquisition algorithm cannot effectively capture the signal. To solve this problem, a weak signal acquisition method based on navigation data estimation is proposed. The capture strategy of this method can be adjusted according to the signal quality, by quickly and accurately estimating the navigation data, thus the impact of navigation data jump on capture sensitivity is reduced. The simulation results show that, for the BeiDou GEO signal with length of 60 ms and signal-to-noise ratio of -34 dB, the acquisition success rate of this method is 80%, and the acquisition time is equivalent to that of the full-bit method.

Key words: font-size:15.04px, ">Beidou Navigation Satellite System(BDS), weak signal acquisition, coherent integration, software receiver

CLC Number:

LYU Zipeng, ZHANG Jianjun, LYU Lin, HAN Ming, DENG Qi. A weak signal acquisition method for BeiDou GEO satellite[J]. Journal of Civil Aviation University of China, 2023, 41(3): 19-24.

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