BDS receiver antenna phase center calibration

doi:10.11947/j.AGCS.2020.20190072

Abstract

Abstract: In high-precise GNSS applications, the effects of receiver antenna phase center offset(PCO) and antenna phase center variation (PCV) are not negligible. At present, the antenna phase correction grid file released by IGS only contains the calibration values of GPS/GLONASS, but there are no the calibration values of the BeiDou system (BDS) released. In this paper, we use time-difference to calibrate and fit GPS L1/L2 & BDS B1I/B2I/B3I PCOs and PCVs of unknown antenna, depending on the characteristics that robot can be used to control the free rotation of the antenna and realize omnidirectional GNSS observation in few hours. Compared with the IGS published values, the calibration results show that the estimated GPS PCOs using the least squares on L1/L2 are less than 1 mm for STD and RMS. The STD of the BDS PCOs estimation values are 0.5, 0.3, 0.3 mm on B1I/B2I/B3I, respectively. The GPS PCV grid values fitted by the spherical harmonic function are less than 1.5 mm below 75 degrees zenith compared to the IGS published value. The BDS PCVs fitting ranges from -5 to 8 mm with zenith, and the curve is trough with the zenith variation. As azimuth changing, the BDS PCVs have a large fluctuation in fitting values at low elevation, and the peak to peak has a maximum of 5.6 mm.

Key words: GNSS, antenna phase center, PCO, PCV, BDS, robot calibration

CLC Number:

P228

WANG Jiachen, LIU Genyou, GUO Aizhi, XIAO Gongwei, WANG Binbin, GAO Ming, WANG Shengliang. BDS receiver antenna phase center calibration[J]. Acta Geodaetica et Cartographica Sinica, 2020, 49(3): 312-321.

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