Abstract
The results of development and testing of new PPP-method realization (Precise Point Positioning) for high-precision determination of Low Earth Orbit satellites (LEOS) trajectory parameters using the results of on-board GPS-observations and kinematic (geometric) positioning mode are presented. The peculiarities and features of the proposed variant of the PPP–method of GPS-observation processing with using of precise ephemerides and GPS satellites clocks as well as other information from the international IGS service and the French space agency CNES are described. The components of the observation error model and the results of “a priori” and “a posteriori” accuracy estimation of coordinate determinations are described. Using the example of on-board GPS-observations processing from specialized LEOS COSMIC it is indicated that for observation intervals of 30–40 minutes and more sub-decimeter accuracy of LEOS positioning may be achieved. The results of comparison of convergence of “float” and discrete/integer (“fixed”) methods of carrier-phase ambiguity resolution are presented. The presented development may be used for high-precision positioning and timing support of modern satellite technologies to detect contaminants, erosion studies, support of scientific and applied projects in geodesy, geophysics, climatology, orbitography, meteorology. The research results may be used in solving the problems of the LEOS maneuvering and docking.
Highlights
Equipping of Low-Earth Orbit Satellites (LEOS) with global navigation satellite systems (GNSS) receivers, in particular, GPS system, opens unique opportunities of scientific researches in such areas as geodesy, geodynamics, updating of geoid, space weather monitoring, meteorology etc
To compensate the basic errors of observations the Precise Point Positioning (PPP) method implies the use of high-precision parameters of orbits and satellite clocks, inter-frequency delays in the analog tracks of GNSS satellites [1,2,3, 5, 6], which are given for use by the international and national centers of
The analysis shows that practically all foreign large companies-developers of hardware and software for GNSS-positioning have their own implementation of the PPP-method in both options
Summary
Equipping of Low-Earth Orbit Satellites (LEOS) with global navigation satellite systems (GNSS) receivers, in particular, GPS system, opens unique opportunities of scientific researches in such areas as geodesy, geodynamics, updating of geoid, space weather monitoring, meteorology etc. The implementation of the differential method for LEOS trajectories determination is conjugated with considerable difficulties due to the drastically different conditions of observations on board the LEOS and on the Earth, small intervals of the conjoint radio visibility of medium-orbit GNSS satellites from board the LEOS and reference stations, LEOS positioning difficulties over the oceans. Another method of precision determination of LEOS trajectory parameters is to use only autonomous GNSS-observations on board the LEOS without using the measurements of reference stations. The current interest is the creation of hardware and software means for high-precision coordinate-timing support of spacecrafts of various purposes and, in particular, the implementation of LEOS PPP-positioning with sub-decimeter accuracy using GNSS signals
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