BDS multi-frequency observation minimum noise coefficient combination method

doi:10.11947/j.AGCS.2023.20220467

Abstract

Abstract: In high-precision satellite positioning, multi-frequency observation can be used to construct combinations such as long wavelength, ionospheric-free delay and geometric-free distance, which can effectively solve the problems of carrier phase ambiguity, ionospheric delay and cycle slip. In this paper, a multi-frequency minimum noise coefficient combination method is proposed in terms of real coefficient combination, which takes the minimum noise coefficient after combination as the basic principle, and analyzes the minimum noise coefficient combination between ionospheric-free and ionospheric-combined case.In the process of minimum noise coefficient combination, the more frequency points used, the higher the observation accuracy after the combination.Ionospheric-free minimum noise coefficient combination mainly considered the influence of observed noise, and compared with single frequency observation, the optimal combination of dual-frequency, triple-frequency, four-frequency, five-frequency and six-frequency improve the observation accuracy by 40%, 53%, 58%, 62% and 64%, respectively.Ionospheric-combined minimum noise coefficient combination takes into account the effect of ionospheric delay and reduces the ionospheric coefficient by appropriately weakening the effect of noise coefficient.According to actual signal results, the improvement effect is basically consistent with the change trend of theoretical analysis.The actual data is used to analyze the positioning accuracy of BDS PPP in decimeter-level satellite-based augmentation service, and the results show that the positioning accuracy of minimum noise coefficient combination is slightly better than that of undifferenced and uncombined observations.

Key words: minimum noise coefficient, BDS, multi-frequency observation combination, optimal combination, observation accuracy

CLC Number:

P228.1

YUAN Rong, XIE Shengli, GAO Feng, LI Zhenni, HUANG Hanjun. BDS multi-frequency observation minimum noise coefficient combination method[J]. Acta Geodaetica et Cartographica Sinica, 2023, 52(8): 1298-1304.

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