Researchers at Telecom SudParis, France, which is part of the Institut Mines-Telecom, a world-leading education and research institution in the fields of information and communication technology, are working on a solution to provide indoor continuity for GNSS positioning. The idea is to deploy a minimal transmission infrastructure in order to allow a standard receiver to measure pseudo-ranges and carrier phases, thus leading to a accurate indoor positioning. The infrastructure consists of several antennas fed through optical fibres with a GNSS-like signal.
The International Conference on Indoor Positioning and Indoor Navigation (IPIN) 2012 and 2013 published the first results of the research, and the latest results will soon be published in a paper, Repealite Based Indoor Positioning System Performance. The papers propose a new approach to indoor positioning: the repealite system. It aims at providing continuity of the positioning service through the use of GNSS-like signals, thus leading to a single technological means: a GNSS receiver, for both outdoors and indoors. A few error sources have been dealt with in order to reach sub-metre accuracy indoors, among which one has to cite multipath and near-far effects. The paper describes a way to reach indoor sub-metre accuracy and the practical current implementation of the system.
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