ON THE DESIGN OF SAMPLE DATA TRACKING LOOPS.
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)
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 01, 1965
- Accession Number
- AD0474683
Entities
People
- R. Gagliardi
Organizations
- University of Southern California