Positioning techniques and telematic applications in the 2.4 GHz-band — Indoor and outdoor analysis results based on a commercial wide band location system

This paper provides an overview about the results of indoor and outdoor ranging measurements by radio based position estimation in the 2.4 GHz-band. A commercial wide band location system represents the basis therefore. Position estimation is based on distance measurements by means of a time of arrival (TOA) ranging method. The linear least square (LS) estimator is used for computing position estimation by transforming the original nonlinear LS problem into a linear one. The obtained accuracy has to be verified for telematics applications, influencing the coordination of road, rail, maritime and air transport. In these fields there are many special applications for example selective detection of a rail track, lane selective localization in automotive applications. The paper concludes with a prospect about further steps concerning the estimation algorithm enhancement.