Modulators – Amplitude modulator – Nonlinear device controlled by modulating signal
Patent
1983-01-26
1985-12-24
LaRoche, Eugene R.
Modulators
Amplitude modulator
Nonlinear device controlled by modulating signal
332 16R, 343 177, H03C 300
Patent
active
045609616
ABSTRACT:
A system and method for generating phase/frequency coded pulses useful in radar and similar applications, (such as simulation of multiple return of targets) by generating frequency modulated pulse compression pulses rapidly with practically no time in between. Typically, the system simulates target returns as FM sweeps or chirps to obtain an echo of a transmitted pulse having a known signature. Digital circuits are employed with finite steps connected to a digital-to-analog converter driving a radio frequency balanced modulator, to produce the desired chirp output. The system generates FM phase modulations by reading two phase history records representing cosine and sine functions in phase quadrature of a to-be-transmitted pulse.
REFERENCES:
patent: 4028700 (1977-06-01), Carey et al.
patent: 4039806 (1977-08-01), Fredriksson et al.
patent: 4195300 (1980-03-01), Gouley
patent: 4404532 (1983-09-01), Welti
Rockland Systems Corp. Anonymous, "ROM Look-Up Generates Sine Wave in Frequency Synthesizer" Progress in Products, p. 45.
LaRoche Eugene R.
Loveman Edward H.
Pascal Robert J.
Republic Electronics, Inc.
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