Modulators – Amplitude modulator – Nonlinear device controlled by modulating signal
Patent
1986-03-12
1986-12-30
LaRoche, Eugene R.
Modulators
Amplitude modulator
Nonlinear device controlled by modulating signal
342 25, 342195, H03C 300, G01S 1300
Patent
active
046331980
ABSTRACT:
The generation waveforms is accomplished using: a computer, two random access memories (RAM), a digital-to-analog converter (DAC), two modulators, two oscillators, and a multiplier. The computer inputs a set of digital waveforms and a first control signal into the first RAM which, when directed, conducts them to the DAC. The DAC converts the digital waveform to an analog waveform, and conducts the analog waveform and the first control signal to the first modulator. The first modulator produces an output signal by single sideband (SSB) modulating an intermediate frequency carrier from the first oscillator with the analog waveform when directed to modulate by the first control signal, and outputs the analog waveform otherwise the multiplier increases the bandwidth of signals from the first modulator by multiplying its output signal. The output of the multiplier is received by the second modulator. The second modulator is a biphase modulator which produces an output signal by biphase modulating a radio frequency carrier signal from the second oscillator with the signal from the multiplier when directed to modulate by a second control signal received from the second RAM, and outputting the signal from the multiplier otherwise. The result is a waveform generator capable of producing three categories of waveforms: single sideband modulated waveforms, biphase modulated waveforms, and waveforms that are both SSB and biphase modulated.
REFERENCES:
patent: 4176328 (1979-11-01), Brown et al.
patent: 4177706 (1979-12-01), Greenberger
patent: 4347403 (1982-08-01), Schwager et al.
patent: 4438503 (1984-03-01), White et al.
patent: 4454486 (1984-06-01), Hassun et al.
patent: 4519027 (1985-05-01), Vogelsberg
patent: 4584708 (1986-04-01), Eilers et al.
Goetz Paul W.
Merley Kim R.
Auton William G.
LaRoche Eugene R.
Mis D. C.
Singer Donald J.
The United States of America as represented by the Secretary of
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