Communications: directive radio wave systems and devices (e.g. – Directive – Beacon or receiver
Patent
1994-07-08
1996-04-30
Issing, Gregory C.
Communications: directive radio wave systems and devices (e.g.,
Directive
Beacon or receiver
342451, 379 59, G01S 124, H04M 1100
Patent
active
055129080
ABSTRACT:
A method for determining the time difference of arrival, tdoa, of signals from a cellular telephone, includes determining tdoas for a plurality of channels, averaging the tdoas from the channels, subtracting the average tdoa from the individual channel tdoas to determine residual channel tdoas and determining an overall residual tdoa from the residual channel tdoas. An apparatus and method for collecting cell phone transmission signals for performing tdoa calculations, includes receiving, digitizing and temporarily storing wideband transmission signals while monitoring a known reverse control channel for a predetermined cell phone number to be located, and permanently storing the delayed reverse control channel signal once the predetermined number is identified.
REFERENCES:
patent: 4433335 (1984-02-01), Wind
patent: 5317323 (1994-05-01), Kennedy et al.
patent: 5327144 (1994-07-01), Stilp et al.
Gomes David W.
Issing Gregory C.
Lockheed Sanders, Inc.
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