Dopplerizing a Signal of Varying Frequency.
DEPARTMENT OF THE NAVY WASHINGTON D C
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The patent relates to closed feedback loop of an oscillator containing a network i.e. a resonant circuit or filter which has a distinct phase-frequency characteristic so as to cause an overall in-phase condition. In the subject feedback loop, shifting the phase of the feedback wave in the filter, the frequency of the oscillator will shift due to its double heterodyning circuit to reestablish a net zero phase shift around the loop. This oscillator is particularly adapted to shift a sonar signal frequency to simulate true doppler shift where this shift is a fixed percentage of the frequency.
- Electrical and Electronic Equipment
- Acoustic Detection and Detectors