GPS palydovų orbitų parametrų paklaidų eliminavimas

Abstract

In the article, the influence of GPS satellite orbit parameter errors on the determination of Earth’s point coordinates is analised. For such analysis there is applied the approach of determining an initial data errors that are presented as the satellite orbit parameter errors. Because the GPS satellite moment coordinates are changed evently, the moment coordinate corrections are calculated at fixed time moments by using the additional parameter approach. The time intervals between the fixed time moments are chosen so that the general number for unknown parameters could be smaller than the number of correction equations, e.g. k < n . A correction equation system with data of all epoch measurements is used. The corrections for satellite moment coordinates are determined in the form of additional parameters when the latest are fitted to appropriate epoch. The calculated additional parameter values in practice are not used. The essence of such computations is understood so that the satellite moment coordinate errors presented in the form of corrections are eliminated from measurement data errors. It has been shown, using the formulae of Frobenius, that in the above case the real accuracy estimation of parameter values is obtained.