Accession Number : AD0474683


Title :   ON THE DESIGN OF SAMPLE DATA TRACKING LOOPS.


Descriptive Note : Technical progress rept.,


Corporate Author : UNIVERSITY OF SOUTHERN CALIFORNIA LOS ANGELES DEPT OF ELECTRICAL ENGINEERING


Personal Author(s) : Gagliardi, R


Report Date : Oct 1965


Pagination or Media Count : 35


Abstract : A key component in the tracking of space vehicles is the ground tracking loop which attempts to instantaneously remain locked to the varying delay of a returning vehicle signal. In typical operation these signals are continuous in time, and the problem is basically one of phase locking a local oscillator. Often, however, one is forced into the problem of having to synchronize a tracking loop to periodic signals of low duty cycle, like narrow pulses. In such cases a predominate sensitivity advantage can be achieved by using a modified loop containing a sample and hold circuit. Such a modification, however, complicates the loop design. In this paper, design constraints are determined for a typical sample data tracking loop, with particular emphases on the requirements for loop gain and loop filter functions which effect delay tracking jitter, thresholding effects, and acquisition time. (Author)


Descriptors :   *RADAR TRACKING , *RADAR SIGNALS , SYNCHRONIZATION(ELECTRONICS) , DATA PROCESSING , DELAY CIRCUITS , SENSITIVITY , CIRCUITS , MATHEMATICAL ANALYSIS , EQUATIONS


Subject Categories : Active & Passive Radar Detection & Equipment


Distribution Statement : APPROVED FOR PUBLIC RELEASE