Communications: directive radio wave systems and devices (e.g. – With particular circuit – For frequency modulation
Patent
1998-07-10
2000-06-27
Sotomayor, John B.
Communications: directive radio wave systems and devices (e.g.,
With particular circuit
For frequency modulation
342203, 342204, G01S 7282
Patent
active
060812265
ABSTRACT:
A radar exciter including a direct digital synthesis (DDS) wideband waveform generator which performs the frequency synthesis function heretofore performed by a direct analog synthesizer. This is achieved by deriving the DDS frequencies, the exciter RF frequencies, the radar synchronizer clock frequency and receiver analog/digital (A/D) converter clock frequency from a common signal source generating a master frequency. The present invention eliminates the direct analog synthesizer and relies solely on the digital generation of waveforms by a DDS wideband waveform generator which performs a discrete sampling process so as to provide coherent frequency and timing relationships.
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Caldwell Stephen P.
Hopwood Francis W.
Lisle, Jr. Thomas K.
Weigle Wayne
Northrop Grumman Corporation
Sotomayor John B.
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