Spread signal spectrum communication circuits and system
First Claim
1. An apparatus for generating a spread spectrum frequency signal comprising signal generating means capable of simultaneously generating a plurality of selected frequency signals being a multiple of at least one primary frequency, said signal generating means further being capable of phase shifting selected ones of said plurality of signals by a selected phase shift value such that a resultant signal resulting from a simultaneous sum of said plurality of signals including said selected phase shifted signals is substantially uniform in amplitude and devoid of large amplitude signal segments.
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Accused Products
Abstract
The present invention provides a covert radar system in which radar signals emitted are capable to search receiver thermal noise and, therefore, are substantially undetectable in the normal radar operating range.
43 Citations
9 Claims
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1. An apparatus for generating a spread spectrum frequency signal comprising signal generating means capable of simultaneously generating a plurality of selected frequency signals being a multiple of at least one primary frequency, said signal generating means further being capable of phase shifting selected ones of said plurality of signals by a selected phase shift value such that a resultant signal resulting from a simultaneous sum of said plurality of signals including said selected phase shifted signals is substantially uniform in amplitude and devoid of large amplitude signal segments.
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2. A spread spectrum frequency signal generator comprising:
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frequency generating means capable of providing a first plurality of harmonic frequencies of a first frequency; phase shifting means for shifting the phase of selected ones of said first plurality of frequencies; and first summing means for summing at the same time said phase shifted frequency signals and remaining ones of said plurality of frequencies. - View Dependent Claims (3, 4, 5, 6)
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7. A spread spectrum frequency signal system comprising:
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a signal generating means having frequency spectrum signal generating means capable of generating a first plurality of harmonic frequency signals of a first frequency, and capable of phase shifting selected ones of said first plurality of signals, first summing means for summing at the same time said phase shifted ones and the remaining ones of said first plurality of signals and producing a first sum signal, signal mixing means for mixing a carrier frequency signal with said first sum signal, and producing a first resultant signal having a frequency spectrum including frequency components of said first plurality of signals, encoding means for phase coding said first resultant signal in accordance with a selected code; transmitting means for transmitting said phase coded first resultant signal; receiving means including, means for producing a received signal derived from said transmitted phase coded resultant signal, decode means for decoding said received signal in accordance with said selected code so as to generate a reconstructed resultant signal related to said first resultant signal, means for removing said carrier frequency from said received reconstructed resultant signal; and information means responsive to said reconstructed resultant signal for producing an information signal having selected frequency components of said first plurality of harmonic frequencies. - View Dependent Claims (8, 9)
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Specification