Analysis of multipath effects on LEO ranging-based positioning using BPSK and BOC signals in urban areas

IF 2.8 3区地球科学 Q2 ASTRONOMY & ASTROPHYSICS

Advances in Space Research Pub Date : 2025-02-01 DOI:10.1016/j.asr.2024.11.049

Qi Zhang, Bing Xu

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引用次数: 0

Abstract

Low Earth orbit (LEO) satellites have emerged as a promising solution for positioning in environments where traditional Global Navigation Satellite System (GNSS) faces challenges, such as urban canyons. However, the impact of multipath effects on LEO positioning in such urban settings remains unclear. This study investigates the influence of multipath effects on LEO ranging-based positioning, considering signals with binary phase shift keying (BPSK) and binary offset carrier (BOC) modulations. Theoretical analysis reveals that LEO signals exhibit larger Doppler differences between the direct signal and the reflected signal. This characteristic holds particular promise for mitigating multipath effects, especially when utilizing a high frequency carrier. Subsequently, the study assesses the performance of LEO range measurements and positioning under multipath conditions through a simulated LEO constellation. Comparative analyses are conducted with GNSS performance as benchmarks. Additionally, the effectiveness of BOC modulation in enhancing LEO pseudorange positioning accuracy is observed. The results demonstrate that BOC signals can achieve higher ranging and positioning accuracy than BPSK signals. This finding underscores the potential of LEO satellites as reliable alternatives for navigation in challenging urban environments, highlighting the importance of modulation techniques in optimizing positioning performance.

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来源期刊

Advances in Space Research 地学天文-地球科学综合

CiteScore

5.20

自引率

11.50%

发文量

800

审稿时长

5.8 months

期刊介绍： The COSPAR publication Advances in Space Research (ASR) is an open journal covering all areas of space research including: space studies of the Earth''s surface, meteorology, climate, the Earth-Moon system, planets and small bodies of the solar system, upper atmospheres, ionospheres and magnetospheres of the Earth and planets including reference atmospheres, space plasmas in the solar system, astrophysics from space, materials sciences in space, fundamental physics in space, space debris, space weather, Earth observations of space phenomena, etc. NB: Please note that manuscripts related to life sciences as related to space are no more accepted for submission to Advances in Space Research. Such manuscripts should now be submitted to the new COSPAR Journal Life Sciences in Space Research (LSSR). All submissions are reviewed by two scientists in the field. COSPAR is an interdisciplinary scientific organization concerned with the progress of space research on an international scale. Operating under the rules of ICSU, COSPAR ignores political considerations and considers all questions solely from the scientific viewpoint.