METHOD AND SYSTEM FOR JAMMING SIMULTANEOUSLY WITH COMMUNICATION USING OMNI-DIRECTIONAL ANTENNA
First Claim
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1. A system for simultaneously handling a communication signal with a jamming signal comprising:
- (a) a jamming signal generator for generating a jamming signal of a desired type;
(b) a local oscillator (LO) for generating a local oscillator signal of a desired frequency;
(c) a double-sideband suppressed carrier modulator for modulating the jamming signal into a modulated jammer signal having two sideband components with local oscillator frequency rejection thereby forming a steep notch between them encompassing the local oscillator frequency; and
(d) a communication signal antenna and circuitry for handling a communication signal modulated at or near the local oscillator frequency and positioned within the notch formed between the sideband components of the modulated jammer signal, thereby enabling jamming simultaneously with handling of the communication signal.
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Abstract
Double-sideband suppressed carrier (DSSC) modulation is used in concert with local oscillator (LO) rejection to create a steep notch for a communication signal within a jamming signal. The double-sideband suppressed carrier modulation may use upper and lower sidebands which are symmetrical or asymmetrical. An equivalent very high Q band-pass notch is synthesized within the jamming sideband signals. The jammer signal can be split into four signals in quadrature phases and fed to a four-square vertical dipole antenna design that results in a null along the axis of the array'"'"'s center on which a communication antenna is aligned.
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Citations
20 Claims
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1. A system for simultaneously handling a communication signal with a jamming signal comprising:
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(a) a jamming signal generator for generating a jamming signal of a desired type; (b) a local oscillator (LO) for generating a local oscillator signal of a desired frequency; (c) a double-sideband suppressed carrier modulator for modulating the jamming signal into a modulated jammer signal having two sideband components with local oscillator frequency rejection thereby forming a steep notch between them encompassing the local oscillator frequency; and (d) a communication signal antenna and circuitry for handling a communication signal modulated at or near the local oscillator frequency and positioned within the notch formed between the sideband components of the modulated jammer signal, thereby enabling jamming simultaneously with handling of the communication signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A method for simultaneously handling a communication signal with a jamming signal comprising:
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(a) generating a jamming signal of a desired type; (b) generating a local oscillator signal of a desired frequency; (c) modulating the jamming signal into a modulated jammer signal having two sideband components with local oscillator frequency rejection thereby forming a steep notch between them encompassing the local oscillator frequency; (d) handling a communication signal that is modulated at or near the local oscillator frequency and positioned in the notch between the two jammer sideband components. - View Dependent Claims (15, 16, 17, 18)
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19. An antenna for simultaneously handling a communication signal with a jamming signal comprising:
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(a) four antennas formed as vertical dipoles of an array formed in a square configuration with each other, each adapted to receive a respective one of four jammer signals in phase increments of 0, 90, 180, and 270 degrees, wherein the orientation of the antennas combined with sequential phasing results in a null along a center axis of the array; and (b) a communication antenna for handling a communication signal aligned with the center axis of the array. - View Dependent Claims (20)
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Specification