Practical result of wireless indoor position estimation by using hybrid TDOA/RSS algorithm

Location Determination in an indoor environment is a challenge that faces the wireless industry. The concept of indoor geolocation was established in order to provide the user´s location inside buildings during an emergency where GNSS services are not effective. Keeping public safety in mind, it is not only important to estimate the position, but also to provide a high level of reliability. The paper presents practical results and issues related to the accuracy of an indoor geolocation system which uses a WCDMA signal at a 2.45 GHz carrier frequency. The experiment employs a hybrid TDOA/RSS algorithm and a TDOA only algorithm. Practical results indicate that the performance is improved by using hybrid TDOA/RSS algorithm as compared to TDOA alone.