Jamming signal cancellation system
First Claim
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1. In a radar system, apparatus for recovering desired radar signals from an input signal which includes noise jamming signals of higher intensity, comprising:
- a balanced modulator;
means for applying a portion of the input signal to one input of said balanced modulator;
means for detecting the difference frequency produced by the beating of the desired signal with the jamming signal; and
means for applying said detected signal to a second input of said balanced modulator whereby the output of said balanced modulator will contain the desired signal but not the jamming signal.
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Abstract
Improved radar system performance in a jamming environment is achieved by detecting the AM difference frequency produced by the beating of the desired radar signal with the jamming signal and applying same to one input of a balanced modulator while simultaneously applying the received signal (containing both the desired radar signal and the jamming signal) to the other input of the balanced modulator whereby the output from the balanced modulator contains the desired signal but not the jamming signal.
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Citations
16 Claims
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1. In a radar system, apparatus for recovering desired radar signals from an input signal which includes noise jamming signals of higher intensity, comprising:
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a balanced modulator; means for applying a portion of the input signal to one input of said balanced modulator; means for detecting the difference frequency produced by the beating of the desired signal with the jamming signal; and means for applying said detected signal to a second input of said balanced modulator whereby the output of said balanced modulator will contain the desired signal but not the jamming signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. Apparatus for receiving noncooperative radar signals proximate an active transmitter which is generating noise jamming signals of higher intensity, comprising:
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a balanced modulator; means for applying a portion of the received signal including the radar signals and noise jamming signals to one input of said balanced modulator; means for detecting the difference frequency produced by the beating of the radar signal with the jamming signal; and means for applying said detected signal to a second input of said balanced modulator whereby the output of said balanced modulator will contain the radar signal but not the jamming signal. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16)
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Specification