Investigation of the most suitable location finding techniques for Istanbul in GSM1800 network

Abstract

Although there isn’t yet a successful deployment of a Location Services among the existing worldwide operators, locating the subscriber is still appealing, thus there are many ongoing studies on the topic. While locating subscriber, an important criteria is the accuracy of the result. However, each application requires different level of accuracy, and not a unique solution may fulfill all these needs at once. This last one makes the location more challenging. In this work, several already existing techniques, such as CellID, and Signal Strength methods, are applied to field measurements that were done in the real commercial GSM network in Istanbul. Then, a newly emerging method, which is the Database Correlation Method (DCM); is also applied and comparisons are done. This method is not imposing any change for the subscribers terminal, thus this makes it more important and acceptable. The results obtained by the SS and DCM, are also exposed to the post processing (Kalman Filtering) steps. Significant improvements in the results are concluded after these processes applied.