Detection and selection of a reference signal for network-based wireless location
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United States of America Patent
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Jun 19, 2012
Grant Date -
Apr 12, 2012
app pub date -
Oct 8, 2010
filing date -
Oct 8, 2010
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A serving mobile location center (SMLC) receives a position request concerning a mobile-of-interest (MOI) operating in a discontinuous transmission (DTX) mode, and in response a wireless location system (WLS) is tasked to locate the MOI. A plurality of location measurement units (LMUs) are instructed to receive and digitize radio frequency (RF) energy. At the LMUs, a signal of interest is received and cross-correlated with a known training sequence to produce a received detection metric. The detection metric is weighted to favor the MOI even in the presence of interference from other mobile devices. The SMLC selects the LMU with the best weighted detection metric as a reference site and selects two or more LMUs with lesser weighted detection metrics above a threshold as co-operating sites. The received signal of interest is demodulated and demodulated data are distributed to the co-operating sites. The co-operating sites produce a reference waveform and cross-correlate the reference waveform with stored data to produce a TDOA measurement at each co-operating site, and the TDOA measurements are used to compute MOI position information.
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