Download e-book for kindle: An Assessment of Precision Time and Time Interval Science by National Research Council, Division on Engineering and

By National Research Council, Division on Engineering and Physical Sciences, Naval Studies Board, Committee for an Assessment of Precision Time and Time Interval Science and Technology

ISBN-10: 0309085225

ISBN-13: 9780309085229

Committee for an overview of Precision Time and Time period technological know-how and expertise, nationwide study Council, department on Engineering and actual Sciences, Naval stories Board

Knowledge of time is vital to specific wisdom of position, and for that reason the military, with its have to navigate at the excessive seas, has traditionally performed an enormous function within the improvement and alertness of complex time recognition and dissemination applied sciences. Discoveries coming from uncomplicated study funded via the place of work of Naval learn (ONR) lie on the middle of modern optimum functionality atomic clocks, Naval examine Laboratory (NRL) services performed a job in constructing the space-qualified atomic clocks that allow the worldwide Positioning method (GPS), and the U.S. Naval Observatory (USNO) keeps and disseminates the traditional of time for the entire division of security (DOD). The army has made significant investments in so much elements of precision time and time period (PTTI) technological know-how and expertise, even if particular PTTI-related study has additionally been funded via the safety complex learn initiatives service provider (DARPA) and non-DOD organisations akin to the nationwide technological know-how origin (NSF), the nationwide Aeronautics and house management (NASA), and the dept of trade. army investment, principally via ONR, has a historical past of being an early enabler of key new advancements. sensible investment judgements by way of the Navy-particularly via ONR software officers-have underpinned many of the significant advances in PTTI technology and know-how (S&T) within the final 50 years.

PTTI is critical to trendy naval wishes, and certainly to the entire armed providers, to be used in either navigation and communications. particular time synchronization is required to successfully verify the beginning of a code series in safe communications, to accomplish navigation, and to find the location of sign emitters. designated frequency regulate is needed in communications for spectrum usage and frequency-hopped spread-spectrum recommendations. there are various examples of crucial army operations that depend upon PTTI and will make the most of advancements in PTTI know-how. those contain:

-GPS clocks and self reliant operations,

-Weapon procedure 4-dimensional coordination,

-GPS antijamming,

-Network-centric war, and

-Secure army communications.

This file summarizes that savings within the dimension, weight, and gear requisites and raises within the ruggedness of PTTI units with no sacrificing functionality might placed extra exact and unique timekeeping within the palms of the warrior, enhancing functions in all the above operations.

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Given the level of sophistication this work involves, it typically takes 5 to 10 years for a person to become fully productive. A number of national laboratories or government-supported institutions train new scientists and engineers in atomic clock technology. D. students and 40 postdoctoral students. In the same time frame, JPL, in conjunction with the University of Southern California and the University of California at Riverside, supported more than 20 undergraduate students, approximately 5 doctoral students, and 10 to 15 postdoctoral students.

Beverly, Mass. C. FAA/ISI, Vienna, Va. Highland Technology, San Francisco, Calif. Hughes Space and Communications Company, Los Angeles, Calif. , McLean, Va. Innovative Solutions International, Vienna, Va. Jet Propulsion Laboratory, Pasadena, Calif. Lawrence Livermore National Laboratory, Livermore, Calif. National Institute of Standards and Technology, Boulder, Colo. C. Navward Systems, Dallas, Tex. , Anaheim, Calif. Pacific-Sierra Research Corporation, San Diego, Calif. Raytheon Systems Company, Fullerton, Calif.

Fountain standards are particularly susceptible because the atoms in the fountain have low velocities. Linear Acceleration Good quartz resonators, as mentioned above, have sensitivities in the range of 10–9 to 10–10 per g. Using Mach’s principle, this sensitivity is easily measured by rotating the oscillator 180 degrees relative to Earth’s gravitational field for various initial orientations and measuring the frequency change due to the resulting 2 g change in acceleration. Acceleration can also affect the LO frequency indirectly owing to the resulting change in the temperature distribution or stress on the oscillator’s electronic components.

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An Assessment of Precision Time and Time Interval Science and Technology by National Research Council, Division on Engineering and Physical Sciences, Naval Studies Board, Committee for an Assessment of Precision Time and Time Interval Science and Technology

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