Study on Applications of LBS Based on Electronic Compass

Location based services (LBS) is regarded as a key feature of many future mobile applications. GPS serves well for most outdoor applications; however, its dependence on satellites makes it ineffective in indoor environments. The essential elements to LBS have been a two-way wireless data communications link plus navigation data inputs to permit a screened flow of information from LBS data servers. Today, most LBS system designers consider the fusion of Global Position Satellite (GPS) receivers and cellular phone services the starting point. Electronic compass is another navigation aid that LBS can use along with wireless services and GPS data. Electronic compass rely on sensing the earth´s magnetic field, and supply a electronic compass heading angle based on a north heading reference. By assigning a wireless phone or telematics receiver a forward direction for pointing, the resulting pointing/heading angle is essential in LBS applications to indicate to the data server what you are pointing to. We propose a method to use electronic compass to achieve accurate location positioning indoor. The principle of positioning the electronic compass are discussed in this paper, This paper is intended to show that magnetic electronic compass is a key feature for quality location based services functionality.