Precision analysis of orbit prediction of GPS satellites

It gives perturbative force model which is adopted by orbit fitting and orbit prediction at length and dicusses the process of orbit fitting and orbit prediction.First,high precise osculating orbit parameters is attained by fitting orbit;then,it extrapolates the 7-days orbit;at last compares the 7-days orbit with the IGS final orbit in order to get the precision of orbit prediction of GPS satellites.For every satellite,the error of along track direction is distinct,but the error of radial and out of plane direction are not distinct;the precision of orbit prediction of eclipsing satellites is much lower than the common satellites;the error of orbit prediction of eclipsing satellites is especially large.