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A picosecond resolution Time Digitizer for laser rangingThe Time Digitizer capable of covering a range of 0.34 sec in 9.76 psec increments is described. The time interval between a pair of start-stop pulses is digitized coarsely in 20 nsec periods by a very accurate 50 MHz reference clock. The residual fractions of a clock period at the start and the stop end of the measured interval are stretched in two interpolators and digitized in 9.76 psec increments. An equivalent digitizing frequency of 102.4 GHz is thus achieved. The digitizer is built in a minicrate and communicates via a standard crate controller. It is intended for use in the laser ranging between ground stations and the Laser Geodetic Satellite (LAGEOS). It is shown that the distribution in any two adjacent 9.76 psec channels of a small number of identical test time intervals is essentially binomial. The performance of the digitizer and test results are given.
Document ID
19780041394
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
Authors
Turko, B.
(California, University Lawrence Radiation Laboratory, Berkeley, Calif., United States)
Date Acquired
August 9, 2013
Publication Date
February 1, 1978
Subject Category
Instrumentation And Photography
Accession Number
78A25303
Funding Number(s)
CONTRACT_GRANT: W-7405-ENG-48
CONTRACT_GRANT: NDPR-S-55772A
Distribution Limits
Public
Copyright
Other

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