Short-term prediction of the compensated force model

For Portable Navigation Devices, it is difficult to obtain the real-time satellite pseudorange from observation station. Short-term orbit prediction is an effective method to reduce the time to first fix (TTFF) by using the broadcast ephemeris. In conventional method, the initial state of a satellite is estimated by its broadcast parameters, the orbit of a satellite is predicted by its force model. The force model mainly includes Earth's gravity, solar and lunar gravitation and solar radiation pressure. In this paper, a force model compensation method based on satellite historical position information is proposed, and the compensation force model is used to predict the future position of the satellite. The experimental results show that the compensation model can effectively improve the accuracy of orbit prediction.