An Effective Approach in Improving A-GPS Accuracy to Enhance Hybrid Positioning Computation

Applications using location-based services have been explored due to safety and emergency requirements on wireless communications services. The inter working among heterogeneous systems induces the hybrid positioning concept with multiple positioning technologies. This study focuses on the improvement of GPS orbit accuracy to enhance hybrid position computation. The proposed approach by converting precise orbit into broadcast ephemeris format is proved to be an effective method. Both two-hour and 3.5-hour orbit conversion results show that an orbit accuracy of less than 0.4 meters can be achieved. The results suggest that the proposed approach has a potential in real time application.