1
Kelly Davidson Hawkes, Michael Shaw McKinley, Kenneth Irwin Talbot: Cellular telephone fraud prevention system using RF signature analysis. Corsair Communications, David E Lovejoy, May 18, 1999: US05905949 (184 worldwide citation)

Apparatus for identifying wireless subscriber units and for determining if access to a communications network should be granted. A plurality of wireless subscriber units each generates a wireless subscriber signal including internal data traits and external signal traits. The internal data traits in ...


2
Kelly Davidson Hawkes, Jeffrey Lynn Koehler: Method and apparatus for mobile emitter location. Corsair Communications, Fish & Richardson PC, October 26, 1999: US05973643 (178 worldwide citation)

A location system for identifying locations of emitters in a cellular telephone service area. Searching identifies active emitters in the service area to find the coarse areas in which active emitters are located, using selection criteria to designate one or more of the active emitters as selected e ...


3
Max B Frederick: Cellular telephone anti-fraud system. Corsair Communications, Harness Dickey & Pierce, September 5, 1995: US05448760 (70 worldwide citation)

Authorized use of a wireless subscriber system, e.g. cellular telephone system, is distinguished from unauthorized use by electronically observing a plurality of external signal traits which represent alterations in the radio frequency signal due to physical characteristics identified with a particu ...


4
Max B Frederick: Cellular telephone anti-fraud system. Corsair Communications, David E Lovejoy, December 5, 2000: US06157825 (27 worldwide citation)

A transmitter identification system to determine if cellular phones in a cellular phone system are authorized as distinguished from cloned phones, operated by fraudulent users, that are unauthorized. Components used in the manufacture of cellular phones vary slightly from one phone to anther so that ...


5
Kelly Davidson Hawkes: Transient analysis system for characterizing RF transmitters by analyzing transmitted RF signals. Corsair Communications, David E Lovejoy, May 26, 1998: US05758277 (21 worldwide citation)

A transient analysis system that characterizes the transients in RF signals from radio transmitters. Transient characterization permits identification of the transmitter and is useful in cellular telephone fraud prevention systems. The characterization is based on the analysis of the chirp waveform ...


6
Robert Eugene Stoddard, Michael Shaw McKinley: Validation method and apparatus for preventing unauthorized use of cellular phones. Corsair Communications, David E Lovejoy, February 9, 1999: US05870672 (18 worldwide citation)

Validating identification clusters formed of unique transmitter intercepts and validating clusters based on information within the cluster data with or without the aid of specific intercepts. Transmitter validation signals are allocated for validating specific ones of the transmitters. Analyzers ide ...


7
Kelly Davidson Hawkes: Bit characteristics measurement system for digitally modulated signals. Corsair Communications, David E Lovejoy, November 10, 1998: US05835530 (16 worldwide citation)

System for measurement of the bit period (or bit rate or baud rate or symbol rate) and bit epoch (or symbol epoch) of a digitally modulated signal by extracting a bit time-of-transition array, determining an emphasis array with individual elements thereof relating to corresponding elements of the bi ...


8
Max B Frederick: Cellular telephone anti-fraud system. Corsair Communications, David E Lovejoy, April 4, 2000: US06047174 (15 worldwide citation)

Apparatus for identifying wireless subscriber units and for granting or denying access to a subscriber service includes a plurality of wireless subscriber units each for generating a wireless subscriber signal including internal data traits and external signal traits. The internal data traits includ ...


9
Stoddard Robert Eugene, Mckinley Michael Shaw: Validation method and apparatus for preventing unauthorized use of cellular phones. Corsair Communications, LOVEJOY David E, October 16, 1997: WO/1997/038521

Validating identification clusters (22) are formed of unique transmitter intercepts (20, 21) and validating clusters based on information within the cluster data with or without the aid of specific intercepts. Transmitter validation signals are allocated for validating specific ones of the transmitt ...


10
Hawkes Kelly Davidson, Koehler Jeffrey Lynn: Method and apparatus for mobile emitter location. Corsair Communications, sBOROVOY Roger S, October 22, 1998: WO/1998/047019

A location system for identifying locations of emitters (1) in a cellular telephone service area. Searching (4) identifies active emitters in the service area to find the coarse areas in which active emitters (1) are located, using selection criteria to designate one or more of the active emitters a ...