HIGH-ACCURACY PREDICTION OF SPACECRAFT ORBIT EVOLUTION, ANALYSIS OF VARIOUS PERTURBATIONS IN THE COURSE OF SPACECRAFT MOTION IN LEO AND HEO ORBITS

摘要

Using prediction of GLONASS ephemeris as an example, the paper demonstrates the need to take into account multiple components of the forces perturbing spacecraft (SC) orbits. It presents a classification of perturbations for high-orbit and low-orbit SC, an estimate of the level of their effect on the SC motion, and perturbation models that have been developed to provide an increase in the accuracy of daily predictions for GLONASS and GPS ephemeris by an order of magnitude as compared with the accuracy of the prediction made in accordance with the algorithms recommended in the GLONASS Interface Control Document. The paper presents the results of the simulations demonstrating the effect of each of the perturbing factors on the accuracy of the orbital predictions, which make it possible to determine, based on the required accuracy of the SC orbital prediction, the required list of perturbations included in the model of motion.