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

Abstract

Applications using location-based services have been explored due to safety and emergency requirements on wireless communications services. The interworking 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 twohour 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.

Techniques to improve the GPS precision

“…In the case of AGPS, it is necessary to have mobile devices with active data connection or cell phone like GPRS, Ethernet or WiFi [11]. It is used in the cases where there is a weak signal due to a surrounding of buildings or trees; this implies having a not much precise position.…”