Is a
Patent attributes
Patent Jurisdiction
Patent Number
Date of Patent
December 26, 2006
Patent Application Number
10190606
Date Filed
July 9, 2002
Patent Primary Examiner
Patent abstract
A quadrature multi-frequency ranging system applied to DSSS multipath mitigation problems is described. The QMFR techniques include taking the time-of-arrival measurements on the received signal at a time when the multipath component is at a 90 degree angle to the direct path. Further, the preferred embodiment of the present invention recognizes that when a signal is transmitted at a series of frequencies, and the spread of these frequencies is sufficient, a quadrature or near quadrature condition can be forced to occur, at which the TOA estimation gives the highest certainty of measurement.
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