Workshop 2018
YongQiang Yuan - Improving precise orbit and clock determination for BeiDou-3, Galileo and QZSS with satellite metadata - October 29, 2018 • 437 Views
Satellite metadata/information, including attitude laws and physical characteristics such as mass, dimensions and optical properties, are critical for improving the accuracy of precise orbit and clock determination. In this contribution, we evaluate the benefits of these metadata on orbit and clock modeling for the emerging BeiDou-3, Galileo and QZSS. By modeling BeiDou-3, Galileo and QZS-2 yaw-attitude, the ionosphere-free carrier-phase (LC) residuals can be obviously decreased in yaw maneuver periods. The 3D overlapping RMS can also be reduced by 5~30 % during deep eclipse seasons. By applying BeiDou-3/Galileo/QZSS the a priori box-wing solar radiation pressure (SRP) models with detailed satellite dimensions and optical coefficients, the 3D overlapping RMS values show improvements of 5~15 % when compared to ECOM2 model. The SLR validation reveals that BeiDou-3/Galileo/QZSS the a priori box-wing models have smaller mean bias within ±1 cm. Moreover, the dependencies of SLR residual on the elongation angle almost vanish when the a priori box-wing SRP model is employed. As for Galileo satellite clocks, the a priori box-wing SRP model can eliminate the visible bumps in the Modified Allan deviation (MADEV) at integration time of 20,000s, which are observed in clock estimates with ECOM2 model. Meanwhile, the clock overlapping STD values of Galileo satellites can be improved by 7~20% by applying the a priori box-wing model. Further investigation on improving BeiDou-3 clock estimation will be carried out. Besides, the Earth radiation pressure modeling will also be studied for BeiDou-3, Galileo and QZSS.


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