An Indoor Positioning System (IPS) using Grid Model

Abstract

Abstract:To date many positioning systems are available to determine or track a user's location; three main categories include Global Positioning System (GPS), wide area location system and indoor positioning system. GPS has its limitation (poor signals) in indoor or urban uses, while wide-area location systems are cellular networks dependent. For indoor positioning system many approaches like infrared sensing, radio frequency, ultrasonic etc. are proposed; each of these methods has their own advantages and disadvantages. Considering cost-effectiveness, speed and accuracy a recent interest is growing on using wireless technology. A Wireless Local-Area Network (WLAN) based positioning system has some distinct advantages like low-cost and wider area coverage. This researrch propose a system to determine the location of a mobile terminal or a handheld PDA in high speed, low-cost wireless networks by using the wireless communications infrastructure. The experimental set up used an indoor wireless facility of an auditorium, where signals from three Access Points (APs) were recorded to train a position determination model to calculate and map a position. Grid model was applied and compare the resulted position of a client. A handheld PDA equipped with application software was the client device. The accuracy assessment has been performed to identify the distance errors and the average distance error was found lowest for the grid model. The results of the experiments reveal that the accuracy of 0.05 m can be achieved.

Design and Experimental Validation of an Augmented Reality System With Wireless Integration for Context Aware Enhanced Show Experience in Auditoriums

“…Reference [66] analyzes, in terms of delay spread and by applying ray-tracing based methods, the impact of the presence of 100 people inside a concert hall. References [67,68] present location systems for auditoriums based on the collection of RSSI levels received in the WLAN. Reference [69] describes a Wi-Fi live audio streaming system to connect microphones that is tested in an auditorium.…”

Measuring the Probability of Correctness of Contextual Information in Context Aware Systems

“…The ul_WiFi is calculated using the WiFi grid model indoor positioning method as described in [11]. The WiFi grid model contains three grids from three reference access points.…”

Pragmatic framework of 3D visual navigation for mobile user

“…The indoor positioning systems are available in many approaches like infrared sensing, radio frequency, ultrasonic and scene capture. The concern rises in the flexibility, cost and accuracy of the available system, while the demand for location detection in indoor application is growing, unfortunately Muttitanon et al shows that there is no commonly agreed way to determine accurate position in indoors positioning system [2]. Nevertheless, there is a technique that uses multiple samples from the same access point, taking high correlation into account, to enhance the accuracy of probabilistic WLAN indoor location determination [3].…”