GreyZone: A Novel Method for Measuring and Comparing Various Indoor Positioning Systems

The inaccuracy of the Global Positioning System (GPS) in indoor has sparked many researchers to advance into the development of Indoor Positioning System (IPS). However, from our literature review, one major problem is to compare the positioning accuracy of different approaches. Existing positioning accuracy from most of the existing works was evaluated in vastly different ways, using different test environments and there is no standard way to measure which makes comparison among different IPS a very challenging issue. Therefore, in this paper, a novel method for measuring and comparing the effectiveness of various IPS through a modelling technique is proposed, which is referred to as the GreyZone model. It is a model that is easy to understand and provides abstraction to the test environments and most important of all, various IPS approaches are comparable. To show the effectiveness of the model, several IPS approaches from existing works are evaluated. The differences between these indoor positioning approaches become apparent and subsequently comparable.