[Legacy Report] An Indoor Positioning System Based on Global Positioning System Signals

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The Civil Global Positioning System (GPS) has widespread use in many areas including location based services in wireless communication, traffic management and medical emergency services. Owing to the latest technological advances, with an error of only a few meters, GPS receivers are able to successfully locate themselves outdoors. However, in indoor environments, the GPS signals are attenuated by the walls, windows, metallic infrastructure of the buildings such that, it is not possible to decode GPS signals for location finding. In this talk, an indoor positioning system based on GPS infrastructure will be presented to solve indoor coverage problem. The proposed indoor positioning system consists of directional GPS antennas, RF GPS repeaters and a GPS receiver with improved positioning algorithms. The design and measurement of the directional GPS antenna and the GPS repeater will be discussed in detail. All the RF system components are integrated with improved algorithms for the evaluation of the overall system performance at an indoor site. Results of the experiments show that the proposed system can be used for indoor positioning and hence continuation of the GPS service can be expanded indoors with hardware (antennas + repeaters) additions to buildings and a software update to the standard GPS receivers where indoor coverage is needed.

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