G - Physics – 01 – S
Patent
G - Physics
01
S
G01S 1/04 (2006.01) H04W 64/00 (2009.01) G01S 19/00 (2010.01) H04W 4/02 (2009.01)
Patent
CA 2494719
A method for calibrating and correcting for station bias in a receiver system is provided for use in a wireless location system (WLS), wherein "station bias" is the finite delay between when an RF signal from a mobile transmitter reaches antennae of the system and when the same signal reaches a wideband receiver of the system. The receiver system comprises an antennae array, a filter, cabling coupling the filter to the antennae array, and a wideband receiver operatively coupled to the filter. The method comprises the steps of: measuring the length of cable from the antennae to the filter and determining the corresponding delay associated with the cable length; injecting a known signal into the filter and measuring the delay from the filter input to the wideband receiver; and, combining the delays and using the combined delays to correct subsequent location measurements. In a GPS - based calibration scheme this method may further include correcting for cable lengths associated with the GPS. The WLS may include a plurality of signal collection systems (SCS's) and be overlaid on a wireless communications systems such that a plurality of the SCS's share an antenna with a base station of the wireless communications system. An externally generated reference signal may be used to monitor changes in station bias that may arise due to aging and weather.
Cassan Maclean
Trueposition Inc.
LandOfFree
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