Method of locating a transmitter

Details Method of locating a transmitter Method of locating a transmitter

2008-03-04

2011-11-29

Appiah, Charles (Department: 2617)

Telecommunications

Radiotelephone system

Zoned or cellular telephone system

C455S456600, C455S456300, C455S404200, C455S432100, C455S435100, C342S457000, C342S450000, C342S453000

Reexamination Certificate

active

08068850

ABSTRACT:
A method of locating a transmitter is disclosed. A communications link is established between multiple receiving stations and a control station, and used with a calibration signal to calibrate out the time delay of the communications link. A radiated signal from an unknown transmitter is received at a receiving station and sent to the control station over the communications link. The time of arrival is recorded. Upon receiving a user input, the communication link switches from transmitting the received radiated signal to transmitting the calibration signal. The start of calibration signal is timed to begin at the same time across all of the receiving stations. The communication link time delay for each link is calculated by subtracting the start time from the received time, and the communication link time delay is subtracted from the received time recorded for the radiated signal. TDOA calculations are made to locate the transmitter.

REFERENCES:
patent: 5191342 (1993-03-01), Alsup et al.
patent: 5859613 (1999-01-01), Otto
patent: 5982808 (1999-11-01), Otto
patent: 6600774 (2003-07-01), Otto
patent: 7525484 (2009-04-01), Dupray et al.
patent: 7764231 (2010-07-01), Karr et al.
patent: 2006/0019712 (2006-01-01), Choi

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