Abstract
: Over the past 2 years, the United States Coast Guard Academy has been developing an indoor, spread spectrum geolocation system to track personnel inside buildings under a project funded by the Defense Advanced Research Projects Agency (DARPA) Small Unit Operations Geolocation program. The system has evolved from a single time difference (TD) engineering testbed to a fully functional, six-receiver geolocation system. A hand-held transmitter is carried by the soldier. Six wideband receiver antennas are placed outside the structure with GPS one-pulse-per-second and a reference transmitter supplying sampling time synchronization to all the receivers. In tests, a solution converged every 1 s over the 3,000 samples taken at 28 different points throughout the test area, while 90 percent of the fixes fell within an error circle radius of 2.86 m. The live demonstration of the system reflected its ability to track the individual during a hostage recovery scenario.
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