'Coordinated universal time utc' diaporamas de présentation

Overview of Time and Frequency Metrology

Overview of Time and Frequency Metrology. Michael Lombardi lombardi@nist.gov. NIST Boulder Laboratories. Date and Time-of-Day records when an event happened Time Interval duration between two events Frequency rate of a repetitive event. Types of Time and Frequency Information.

856 views • 83 slides

Time in Distributed Systems

Time in Distributed Systems. Outline. Physical Time NTP in Distributed Systems Lamport Logic Time Vector Clock File Synchronization with Vector Time Pairs. Physical Time.

695 views • 60 slides

4 0 4 . 0 2

800 views • 55 slides

4 0 4 . 0 2

573 views • 55 slides

Evolution of Timescales from Astronomy to Physical Metrology

Dennis D. McCarthy U. S. Naval Observatory. Evolution of Timescales from Astronomy to Physical Metrology. TIMEKEEPING BASICS. Repeatable Phenomenon Length between repetitions Beginning of the repetition Names for the successive repetitions Timescales driven by timekeeping technology.

826 views • 47 slides

Fundamental Concepts

Fundamental Concepts. March 2006. Topics. Preface Time Reference Frames Coordinate Systems Positions and States Aberration Corrections. Preface. This tutorial introduces terminology and concepts used in the later SPICE tutorials.

564 views • 34 slides

Fundamental Concepts

Fundamental Concepts. June 2004. Topics. Preface Time Reference Frames Coordinate Systems Positions and States Aberration Corrections. Preface. This tutorial introduces terminology and concepts used in the later SPICE tutorials.

541 views • 34 slides

Fundamental Concepts

Fundamental Concepts. January 2009. Topics. Preface Time Reference Frames Coordinate Systems Positions and States Aberration Corrections. Preface. This tutorial introduces terminology and concepts used in the later SPICE tutorials.

404 views • 34 slides

Time Scales UT0, UT1, EAL, TAI, UTC

390 views • 33 slides

PNT ADVISORY PANEL MEETING Standard Time and Frequency Applications and GPS 4 October 2007

390 views • 27 slides

Time Scales UT0, UT1, EAL, TAI, UTC

402 views • 27 slides

Time Conversion and Formats

Time Conversion and Formats. June 2004. Overview. Kernels Parsing Time Strings Calendar, DOY, Julian Date Spacecraft Clock Converting Numeric Times Creating Time Strings - Formats Calendar, DOY, Julian Date Spacecraft Clock Local Solar Time Customizing the Time System

259 views • 11 slides

A Security Analysis of Network Time Protocol

A Security Analysis of Network Time Protocol. Paper by Matt Bishop, 1991. Andy Hospodor COEN 317 11/03/03. Sequence. NTP Architecture Overview of Security features Types of attacks on NTP Countermeasures Further reading. Where does time come from?.

392 views • 11 slides

Time Conversion and Formats

Time Conversion and Formats. June 2004. Overview. Kernels Parsing Time Strings Calendar, DOY, Julian Date Spacecraft Clock Converting Numeric Times Creating Time Strings - Formats Calendar, DOY, Julian Date Spacecraft Clock Local Solar Time Customizing the Time System

113 views • 11 slides

Time Conversion and Formats

Time Conversion and Formats. June 2004. Overview. Kernels Parsing Time Strings Calendar, DOY, Julian Date Spacecraft Clock Converting Numeric Times Creating Time Strings - Formats Calendar, DOY, Julian Date Spacecraft Clock Local Solar Time Customizing the Time System

123 views • 11 slides

International Time Zones

317 views • 7 slides