Method and system for locating an unknown transmitter

Details Method and system for locating an unknown transmitter Method and system for locating an unknown transmitter

1990-01-31

1991-04-16

Issing, Gregory C.

Communications: directive radio wave systems and devices (e.g.,

Directive

Including a satellite

342357, 342465, 342387, 342393, H04B 7185, G01S 502, G01S 302, G01S 124

Patent

active

050086790

ABSTRACT:
The method of locating an unknown radio-frequency transmitter includes: (a) receipt of signals radiated from the transmitter by a plurality of receivers; (b) retransmission of the received signals to a plurality of antennas; (c) performing a time difference of arrival (TDOA) calculation which compensates for a relative delay value, which is a function of the distances from the transmitter to each of the receivers, the distances from each of the receivers to the antennas, and the speed of light; (d) performing a frequency difference of arrival (FDOA) calculation which compensates for a relative frequency value, which is a function of the relative velocity of each receiver with respect to the velocity of the Earth; (e) repeating these steps a plurality of times; and (f) determining the location of the unknown transmitter based on the plurality of TDOA and FDOA calculations.

REFERENCES:
patent: 3384891 (1968-05-01), Anderson
patent: 4888593 (1989-12-01), Friedman et al.
W. Smith and P. Steffes, IEEE Transactions on Aerospace and Electronic Systems, vol. AES-25, No. 2, pp. 224-230.
P. Chestnut, IEEE Transactions on Aerospace and Electronic Systems, vol. AES-18, No. 2, pp. 214-218.
Spilker, Jr., "GPS Signal Structure and Performance Characteristics", Navigation: Journal of the Instit. of Navigation, vol. 25, No. 2, Summer 1978.

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