Enemy signal detection and warning system
First Claim
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1. An enemy signal detection and warning system for detecting illumination of a friendly forces target by an enemy transmitter with signal at frequency f1 comprising, in combination;
- a coded tag adapted for mounting on said friendly forces target and adapted to receive a signal at frequency f1 from said enemy transmitter and in response thereto transmit a coded signal at an arbitrary carrier frequency f2 unequal to f1, said tag having an oscillator for generating the carrier frequency f2; and
means under control of friendly forces for receiving the signal at frequency f2 from said tag for thereby determining (a) the fact that said tag has been illuminated by the enemy signal and (b) which particular tag has been illuminated by the enemy signal.
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Accused Products
Abstract
An enemy radar or transmitter transmits a signal at frequency f1. A tag on a friendly forces target receives frequency f1 and, in response thereto, transmits a signal at frequency f2≠f1 modulated by a code unique to the tag. A friendly forces receiver, in response to receiving frequency f2 provides an indication that (a) the tag has received frequency f1, meaning the enemy is operating in the area, and (b) which specific tag has received a signal at frequency f1. The friendly forces can then take appropriate action.
19 Citations
7 Claims
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1. An enemy signal detection and warning system for detecting illumination of a friendly forces target by an enemy transmitter with signal at frequency f1 comprising, in combination;
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a coded tag adapted for mounting on said friendly forces target and adapted to receive a signal at frequency f1 from said enemy transmitter and in response thereto transmit a coded signal at an arbitrary carrier frequency f2 unequal to f1, said tag having an oscillator for generating the carrier frequency f2; and means under control of friendly forces for receiving the signal at frequency f2 from said tag for thereby determining (a) the fact that said tag has been illuminated by the enemy signal and (b) which particular tag has been illuminated by the enemy signal. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification