NAVSYS has developed a Software Defined Radio (SDR) test-bed with the capability of navigating inside of buildings. This test-bed combines Global Positioning System (GPS), wireless communications, and Time-of- Arrival (TOA) Pseudolite technology to provide location indoors for applications such as first responders, warfighters, and location-based services. The system uses network assistance over a wireless 802.11 link to enhance GPS and TOA in low-signal and degraded-signal environments (e.g. tunnels, buildings, under ...
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