Accession Number : ADD011788
Title : Sample Data Phase Locked Loop for Adaptive Doppler Tracker.
Descriptive Note : Patent,
Corporate Author : DEPARTMENT OF THE AIR FORCE WASHINGTON DC
Personal Author(s) : Roeder,A W
Report Date : 23 Apr 1985
Pagination or Media Count : 9
Abstract : Precise phase acquisition and tracking of a data modulated pulse signal in order to recover the data in a low signal to noise ratio environment is achieved by a sample data phase locked loop that is adaptive, second order, and uses baseband polar coordinate processing. The circuit utilizes an adaptive second order loop where the loop bandwidth can be adjusted by a coherence measurement. This provides wide bandwidths during initial acquisition, medium bandwidths during acquisition/track transition and narrow bandwidth during tracking.
Descriptors : *PATENTS, *DOPPLER SYSTEMS, *ADAPTIVE SYSTEMS, *TRACKING, *PHASE LOCKED SYSTEMS, SAMPLING, LOOPS, BANDWIDTH, MODULATION, SIGNAL TO NOISE RATIO, COMMUNICATION AND RADIO SYSTEMS, PULSES, NARROWBAND
Subject Categories : Electrical and Electronic Equipment
Distribution Statement : APPROVED FOR PUBLIC RELEASE