Accession Number : ADD002668

Title :   Dopplerizing a Signal of Varying Frequency.

Descriptive Note : Patent,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON D C

Personal Author(s) : Routh,Claude C

Report Date : 17 Feb 1976

Pagination or Media Count : 4

Abstract : 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.

Descriptors :   *Doppler systems, *Oscillators, *Patents, Feedback, Control, Closed loop systems, Doppler effect, Sonar signals

Subject Categories : Electrical and Electronic Equipment
      Acoustic Detection and Detectors

Distribution Statement : APPROVED FOR PUBLIC RELEASE