An Investigation into the Feasibility of Using Hybrid GPS/CDMA Signal Processing Techniques for one-meter Accuracy Indoor Geolocation


  1. Brousseau, N.
  2. Colman, G.
Corporate Authors
Defence Research Establishment Ottawa, Ottawa ONT (CAN)
This technical memorandum presents the concepts of an indoor geolocaiton system providing an accuracy of one meter, in real time, for the tracking of as many as twenty people. In the scenario that we are considering, the people to be geolocated are collaborating and are willing to carry special equipment. Such a system could be used, for example, to track firemen working inside a burning building. This type of application requires that the equipment carried by the people be light, portable, of a small size, very rugged, highly reliable and with low power consumption. The geolocation system, as a whole, should provide one-meter accuracy, reliable measurements and real time position updates a few times per second. The design is inspired by a few features of both the Global Positioning System (GPS) and the IS-95 Code Division Multiple Access (CDMA) that have been modified and integrated to fulfill the requirement of indoor geolocation. The design of the main features of the system and discussion of the way these features are expected to overcome the difficulties inherent to indoor geolocation are presented. The critical issue of distinguishing between a LOS and a multipath signal has been reviewed and many techniques have been ruled out. However, a contract was issued for further studies on the possible utilization of the Doppler effect to perform that task. TRUNCATED

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Indoor geo-location;Indoor navigation;High Sensitivity GPS;CDMA (Code Division Multiple Access)
Report Number
DREO-TM-2001-062 — Technical Memorandum
Date of publication
01 Nov 2001
Number of Pages
Hardcopy;CD ROM

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