Telecommunications – Radiotelephone system – Zoned or cellular telephone system
Reexamination Certificate
2007-08-14
2007-08-14
Trost, William (Department: 2617)
Telecommunications
Radiotelephone system
Zoned or cellular telephone system
C455S456500, C701S207000, C342S357490, C342S357490, C342S450000, C342S457000
Reexamination Certificate
active
11419645
ABSTRACT:
A technique for estimating the location of a wireless terminal at an unknown location in a geographic region is disclosed. The technique is based on the recognition that there are traits of electromagnetic signals that are dependent on topography, the receiver, the location of the transmitter, and other factors. For example, if a particular radio station is known to be received strongly at a first location and weakly at a second location, and a given wireless terminal at an unknown location is receiving the radio station weakly, it is more likely that the wireless terminal is at the second location than at the first location.
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Dressler Robert Morris
Spain, Jr. David Stevenson
DeMont & Breyer LLC
Ewart James D
Polaris Wireless, Inc.
Trost William
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