Workshop 2018
Bingbing Duan - Phase Biases of GPS L1/L2/L5 for the Purpose of Zero-difference Ambiguity Resolution and Initial Results on Galileo E1/E5a - October 29, 2018 • 798 Views
Rather than fixing double-difference ambiguities based on a network of reference stations, ambiguity resolution of a single receiver requires dedicated satellite orbit, clock, and wide-lane bias products. The IGS (International GNSS Service) CNES/CLS (Centre National d'Etudes Spatiales/ Collecte Localisation Satellites) analysis center provides such GPS products with respect to P1, L1, P2, L2 observations. We estimate GPS wide-lane bias and clock products with respect to C1C, L1C, C2W, L2W observations while fixing the GPS CODE (Center for Orbit Determination in Europe) orbits. Differential code biases of P1-C1 from CODE center are corrected for all the GPS satellites. The estimated GPS wide-lane biases prove to agree fairly well with the CNES products. For particular receivers (user aspect) using the cross-correlation technique that report C2X and L2X rather than C2W and L2W, we prove that the fixing rates of both wide-lane and narrow-lane ambiguities are almost not affected. The resulting products are employed into SENTINEL-3 satellite precise orbit determination for further validation. Compared to float solution, the ambiguity-fixed reduced-dynamic solution reduces the standard deviation of satellite laser ranging residuals from 10.6 mm to 9.1 mm. Moreover, ambiguity fixed kinematic solution marks a notable improvement of more than a factor of two over the float kinematic solution by comparing to the reduced-dynamic solution. The procedure is effective and easy to apply to GPS L1/L5 and Galileo E1/E5a observations. We are going to present some corresponding results as well.

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