Method and apparatus for determining location of an unknown sign

Details Method and apparatus for determining location of an unknown sign Method and apparatus for determining location of an unknown sign

1996-05-16

1998-01-06

Sotomayer, John B.

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

Radar transponder system

Navigational

342147, 342193, 342417, 342 13, G01S 1376, G01S 1384

Patent

active

057060100

ABSTRACT:
A method and apparatus determines the location of a signal transmitter located at an unknown location by using externally-induced intermodulation distortion emitted from the signal transmitter. A transmitter locator emits an interrogation signal having a frequency that is offset from the frequency of the signal emanating from the signal transmitter. The interrogation signal and the carrier signal of the signal transmitter are "mixed" within the signal transmitter to form an intermodulation product signal. The intermodulation product signal having a different frequency is then radiated from the unknown signal transmitter. A receiver tuned to the frequency of the intermodulation signal detects the returned signal and a processor determines the range and direction from the transmitter locator to the location of the signal transmitter.

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