基于低轨卫星OFDM信号侦测的隐蔽定位算法研究

doi:10.12305/j.issn.1001-506X.2024.12.03

Abstract

Abstract:

The rapid development of huge low Earth orbit (LEO) communication mega-constellation satellites provides lots of high-quality signal resources for navigation via signals of opportunity (NAVSOP). A concealed positioning algorithm based on LEO satellite orthogonal frequency division multiplexing (OFDM) signal detection is proposed to address the issue that the existing LEO satellite NAVSOP technology cannot provide sustained and stable positioning services. The proposed algorithm can complement the NAVSOP technology based on satellite beacon signals and provide sustained and stable position information. The influence of Doppler effect on the subcarrier and bandwidth of OFDM signal is analyzed, and the receiver signal is modeled. A new observation and positioning equation based on instantaneous bandwidth is established based on a bandwidth estimation method for OFDM signals based on spectral correction, and a real-time solution with the precision of 10m scale is obtained by least square algorithm. The experimental results show that the proposed algorithm has higher positioning accuracy under low signal-to-noise ratio (SNR) compared with the classical Doppler positioning algorithm.

Key words: navigation via signals of opportunity (NAVSOP), low Earth orbit (LEO) satellite, orthogonal frequency division multiplexing (OFDM) signal, instantaneous bandwidth estimation, concealed positioning

CLC Number:

TN967.2

Bowen GU, Lin LI, Chuanjin DAI, Bo ZANG, Zhigang ZHU, Xiangpu LIU, Junlin TANG. Research on concealed positioning algorithm based on LEO satellites OFDM signal investigation and detection[J]. Systems Engineering and Electronics, 2024, 46(12): 3957-3964.

Figures/Tables 9

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References 30

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参数	Starlink	Oneweb	Iridium	5G NR	LTE
带宽/MHZ	250	250	0.031 5	100	20
频段	Ka, Ku	Ka, Ku	Ka	6 GHz	2.37 GHz
总带宽/GHZ	2	2	0.01	*	*

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Research on concealed positioning algorithm based on LEO satellites OFDM signal investigation and detection

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