Direction finding and mobile location system for trunked mobile radio systems
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United States of America Patent
Stats
-
Jan 7, 1997
Issued Date -
N/A
app pub date -
Oct 26, 1994
filing date -
Aug 20, 1992
priority date (Note) -
Expired
status (Latency Note)
Importance
Abstract
A special mobile radio mobile, vehicle or personal location system is described where the system operates to locate any one of a the transmitters in an SMR system. The present invention operates by identifying the received signals, removing the modulation information to reconstruct a demodulated carrier and analyzing the carrier signals for multipath distortion. The multipath disruptions are removed to calculate the true incident angle of the transmitted signal at a base station. A plurality of base stations are used to simultaneously calculate the incident angle of the transmitted SMR signal and a central location calculates the most probable location of the transmitter based upon triangulation. The incident angle of the transmitted SMR signal at each base station is performed by calculating the phase differences of the incoming voice signal with phase ambiguity minimized by using a plurality of dipole antennas spaced at an irregular distance to eliminate phase ambiguity error.
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