Using The Navstar Global Positioning System As A Global Timing System
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Using the Navstar Global Positioning System as a Global Timing System
The Navstar Global Positioning System (GPS), although primarily designed for three dimensional position and velocity determination, is uniquely capable of providing highly accurate and stable timing information to users. This capability is derived from the time dejay pseudo ranging concept which farms the basis for GPS navigation. The combination of navigation and timing together in one system will make GPS the Precise Time and Time Interval (PTTI) source of choice for the forseeable future. Only GPS can supply continuous timing data world wide, in any weather, to a dynamically moving user at a previously unsurveyed site, with submicrosecond accuracy traceable to an established reference. This paper discusses the application of Navstar GPS to the problems of PTTI dissemination. A short review of the GPS concept leads to a detailed description of the implementation of time transfer through Navstar GPS. Time is followed from the U.S. Naval Observatory (USNO) through the ground control, satellite, and receiving segments of GPS to the user's clock system. The three options by which a user's system can receive from the GPS receivers, currently under development by the DOD, are defined in detail. The electrical/digital/mechanical interface parameters along with suggested methods for their use are outlined for each option. A detailed error model is also presented for the traceability of UTG (GPS) to UTC (USNO). Although absolute accuracy of UTC (GPS) provided to a user is specified to be slightly over 100 nanoseconds rms, substantially better accuracies can be easily achieved. By understanding and working around some of the GPS error uncertainties, real time synchronization between stationary users on the same continent can be controlled to within a few nanoseconds, and absolute post processed time offset with UTC (USNO) measured within 25 nanoseconds or better.
Where Minds and Matters Meet
Author: Volker Janssen
language: en
Publisher: Univ of California Press
Release Date: 2012-12-12
The American WestÑwhere such landmarks as the Golden Gate Bridge rival wild landscapes in popularity and iconic significanceÑhas been viewed as a frontier of technological innovation. Where Minds and Matters Meet calls attention to the convergence of Western history and the history of technology, showing that the regionÕs politics and culture have shaped seemingly placeless, global technological practices and institutions. Drawing on political and social history as well as art history, the bookÕs essays take the cultural measure of the regionÕs great technological milestones, including San DiegoÕs Panama-California Exposition, the building of the Hetch Hetchy Dam in the Sierras, and traffic planning in Los Angeles. Contributors: Amy Bix, Louise Nelson Dyble, Patrick McCray, Linda Nash, Peter Neushul, Matthew W. Roth, Bruce Sinclair, L. Chase Smith, Carlene Stephens, Aristotle Tympas, Jason Weems, Peter Westwick, Stephanie Young
Engineering Satellite-Based Navigation and Timing
This book describes the design and performance analysis of satnav systems, signals, and receivers, with a general approach that applies to all satnav systems and signals in use or under development. It also provides succinct descriptions and comparisons of each satnav system. Clearly structured, and comprehensive depiction of engineering satellite-based navigation and timing systems, signals, and receivers GPS as well as all new and modernized systems (SBAS, GLONASS, Galileo, BeiDou, QZSS, IRNSS) and signals being developed and fielded Theoretical and applied review questions, which can be used for homework or to obtain deeper insights into the material Extensive equations describing techniques and their performance, illustrated by MATLAB plots New results, novel insights, and innovative descriptions for key approaches and results in systems engineering and receiver design If you are an instructor and adopted this book for your course, please email [email protected] to get access to the instructor files for this book.