Perturbation Effect to Orbit Motion of Satellite for Positioning System

In the positioning system established with satellites and ground stations, the sensitivity of the satellite orbit information affects the accuracy of the distance between each satellite and the receiver. Thus, the accuracy of the positioning system is directly dependent on the orbital accuracy of the satellites. In this study, the effect of external disturbances on the satellite orbit was analyzed. First, the orbit propagation model of the satellite is obtained using the Kepler parameters for a oneday period. Then the perturbation effect due to the Earth's gravity, Sun and Moon is modelled. The orbit propagation model is simulated with perturbation model and this perturbation effect is carried out to orbit propagation motion. The model with perturbation effect and the model without perturbation has been compared and analyzed. As seen results, the perturbations due to sun, moon and earth gravitational effects the orbit of satellite. So, the accuracy of positioning system consist of many satellites and earth station is affected by these perturbations. The whole study is modelled in MATLAB/Simulink environment.