Accession Number : ADD003984
Title : Mid-Pulse Detector.
Descriptive Note : Patent,
Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON D C
Personal Author(s) : Fassbind,Frank A
Report Date : 22 Mar 1977
Pagination or Media Count : 7
Abstract : The mid-pulse detector may be used in a receiver to detect the exact time of arrival of a pulse. The mid-pulse detector operation is based upon the principle that the instantaneous phase reversal of a carrier frequency can be readily detected as a zero-crossing of the amplitude modulation function, or waveform. In the prior art, leading edge detection has been used to determine pulse arrival time. The mid-pulse detector of this invention detects a zero-crossing of the modulation function and eliminates this sensitivity to signal amplitude. Another prior art method of mid-pulse detection is the pulse-differentiation technique. This method is sensitive to pulse envelope distortions, which cause the pulse peak to shift relative to the true mid-pulse. Here, again, the phase-locking mid-pulse detector has the advantages of being insensitive to pulse-envelope modulation.
Descriptors : *Patents, *Detectors, *Timing devices, Pulse analyzers, Receivers, Comparators, Phase detectors, Carrier frequencies, Low pass filters
Subject Categories : Electrical and Electronic Equipment
Distribution Statement : APPROVED FOR PUBLIC RELEASE