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The BDSPHERE model during equinox periods considerably improves the orbit accuracy and stability of the BDS GEOs.
We show that the modeling of time variable gravity improves the orbit solutions, at least for the GRACE period where time variable gravity is sufficiently accurately observed by this mission.
This indicates that although the additional observations at elevations up to 86° or 88° are noisier, including them in the POD improves the orbit accuracy for both orbit types.
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In order to test gravitation in the Solar System, it is necessary to improve the orbit restitution of interplanetary spacecrafts.
When used in combination with the S-band tracking data, LR data help to improve the orbit accuracy in the radial direction to ∼15 cm.
Besides, a large value of the number of slices in a polling cycle is helpful to improve the orbit determination performance.
In order to improve the orbit determination accuracy for BDS, a new orbit determination strategy is proposed, in which the satellite clock measurements from TWSTFT are fixed as known values, and only the orbits of the satellites are solved.
Promising methods, which allow to improve the orbit integration of EIRENE while keeping the additional computational effort low, are Adams Bashforth backward formulas.
Previous work showed that the use of an a priori box-wing model for the SRP significantly improves the estimated orbit products as well as orbit predictions compared to purely empirical models.
The new software also improves the real time orbit accuracy for operational altimetry.
In order to improve the Precise Orbit Determination (POD) of the GPS constellation and the Jason-2 Low Earth Orbiter (LEO), we carry out a simultaneous estimation of GPS satellite orbits along with Jason-2 orbits, using GINS software.
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