UNIVERSITI TEKNOLOGI MALAYSIA - FKE - UTM

15Because of the blind spot problem, hybridization positioning approach is utilizingconcurrent GPS and the GSM positioning technologies; GSM positioning used toovercome the blind spot problem of the GPS positioning, so as to provide a betterlocation service.For GPS positioning, there are various filters technique to remove thoseless accurate positions can improve the quality positioning data. Since FleetManagement focus a lot of real time application, hence, commonly used modelbasedKalman filter techniques, is chosen. On top of that, three embedded filtersthat are Speed Spike Filter, Distance Spike Filter and Bearing Filter have beenintroduced to further remove unwanted potential false positions. For GSMpositioning, the readily available information that Mobile Station (MS) that canread using AT command is chosen.2.7 BSmart A300 b’AT UnitFigure 2.3 External view of b’AT