Sensors, Vol. 20, Pages 6544: Study on Optimal Broadcast Ephemeris Parameters for GEO/IGSO Navigation Satellites

Sensors, Vol. 20, Pages 6544: Study on Optimal Broadcast Ephemeris Parameters for GEO/IGSO Navigation Satellites
Sensors doi: 10.3390/s20226544
Authors:
Jin Haeng Choi
Gimin Kim
Deok Won Lim
Chandeok Park

This paper proposes new sets of suitable broadcast ephemeris parameters for geosynchronous (GEO) and inclined geosynchronous (IGSO) navigation satellites (NSs). Despite the increasing number of GEO and IGSO NSs, global positioning system (GPS)-type ephemeris parameters are still widely used for them. In an effort to provide higher fit accuracy, we analyze a variety of broadcast ephemeris parameters for GEO and IGSO satellites along with their orbital characteristics and propose optimal sets of parameters. Nonsingular elements and orbital plane rotation are adopted for alleviating/avoiding the singularity issues of GEO satellites. On the basis of 16 parameters of GPS LNAV, we add one to four parameters out of 28 correction ones to determine optimal sets of ephemeris parameters providing higher accuracy. All possible parameter sets are tested with the least-square curve fit for four BeiDou GEOs and six BeiDou IGSOs. Their fit accuracies are compared to determine the optimal broadcast ephemeris parameters that provide minimum fit errors. The set of optimal ephemeris parameters depends on the type of orbit. User range error (URE) accuracies of the proposed optimal ephemeris parameters ensure results within 2.4 cm for IGSO and 3.8 cm for GEO NSs. Moreover, the exper...

Source: Sensors - November 16, 2020 Category: Biotechnology Authors: Jin Haeng Choi Gimin Kim Deok Won Lim Chandeok Park Tags: Article Source Type: research