Research on the Broadcast Ephemeris Parameters of GPS and GLONASS;

Based on the GPS broadcast ephemeris parameters,the nonlinear least square fit algorithm of broadcast ephemeris parameters was developed,and the relevant calculation formulas were derived.

This paper introduces the least square algorithm used to fit the GPS broadcast ephemeris parameters, and derivates the relevant calculation formulas.

Solving similar GPS broadcast ephemeris parameters using Givens transformation;

Applications of orthogonal polynomials in caculating GPS orbit with broadcast ephemeris;

Evaluation of GPS35 satellite broadcast ephemeris precision by using SLR data;

Equidistant Lagrange interpolation algorithm of GPS broadcast ephemeris;

The study on the model of the diagnosis & forecast for the GPS broadcasting ephemeris error;

The geometric delay errors for GPS common view time comparison between remote clocks are corrected according to broadcasting ephemeris of navigation information and precise ephemeris that IGS provides.

This paper analyzes and compares the differences of the influences of the computed results obtained with broadcasting ephemeris and precise ephemeris on the baseline processing results, and probes into their influences on the positioning accuracy theoretically.

The variations of orbit error of GPS broadcast ephemeris from 2002 to 2006 are analyzed, and some effects on the orbit accuracy are discussed.

On the basis of the orbit character of the LEO satellite and the advantages of definite physical meanings, quickly creating, high precision, fewer parameters of GPS broadcast ephemeris, a new sort of ephemeris parameters for calculating LEO satellite location is designed and analyzed through a example.

In accordance with the fitting GPS broadcast ephemeris parameters,prediction ephemeris was used to make fitting calculation and analysis,in order to evaluate different GPS broadcast ephemeris parameters by using reducing its different ephemeris parameters.