Svn 20 End Of Life Frequency Standard Test Results
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Svn 20 End Of Life Frequency Standard Test Results
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Author :
language : en
Publisher:
Release Date : 1997
Svn 20 End Of Life Frequency Standard Test Results written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1997 with categories.
In early 1989, the first Block II Global Positioning System (GPS) satellites were launched, marking the beginning of the second phase of the GPS program. The satellites were designed for a seven-and-one-half year lifespan and a six-year mean mission duration. Launched in March 1990, SVN 20 was the seventh of the Block II GPS satellites. On 11 May 1996, SVN 20 was set permanently unhealthy to users after being operational for just over six years. Due to degradation of the Attitude Velocity and Control Subsystem (AVCS), SVN 20 was no longer capable of maintaining the stable, earth-pointing platform necessary to perform the GPS navigation mission. However, through intensive maintenance by personnel at the Master Control Station (MCS) at Falcon AFB, it was possible to stabilize the vehicle long enough to perform extensive end-of-life testing on the four on-board atomic frequency standards. These tests on both the cesium and rubidium frequency standards varied in duration and complexity. Of the four frequency standards, one had been operational for five months, two had been used previously but were since off-line for two years and four years respectively, and one had never been initialized. Areas of interest for the rubidium clocks included determination of the temperature coefficient, voltage-controlled crystal oscillator (VCXO) open-loop operations, and measurement of the C-field and VCXO tune ranges. For the cesium frequency standards, the tests focused on Ramsey pattern generation, gain determination through loop time constant measurement, and C-field and VCXO performance degradation. All four clocks were still operational at various levels of performance and accuracy. The results of these tests were encouraging in that they supported conclusions made during the SVN 9 and SVN 10 (Block I) end-of-life testing. It is hoped these results will be useful to the GPS clock community as observations of performance characteristics of space-based atomic frequency standards.
Annual Precise Time And Time Interval Ptti Applications And Planning Meeting
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Author :
language : en
Publisher:
Release Date : 1994
Annual Precise Time And Time Interval Ptti Applications And Planning Meeting written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1994 with Time categories.
26th Annual Precise Time And Time Interval Ptti Applications And Planning Meeting
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Author :
language : en
Publisher:
Release Date : 1995
26th Annual Precise Time And Time Interval Ptti Applications And Planning Meeting written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1995 with Crystals categories.
Scientific And Technical Aerospace Reports
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Author :
language : en
Publisher:
Release Date : 1995
Scientific And Technical Aerospace Reports written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1995 with Aeronautics categories.
Annual Precise Time And Time Interval Ptti Applications And Planning Meeting
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Author :
language : en
Publisher:
Release Date : 1995
Annual Precise Time And Time Interval Ptti Applications And Planning Meeting written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1995 with Time categories.
Nasa Conference Publication
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Author :
language : en
Publisher:
Release Date :
Nasa Conference Publication written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on with Aeronautics categories.
Government Reports Announcements Index
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Author :
language : en
Publisher:
Release Date : 1995-12
Government Reports Announcements Index written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1995-12 with Science categories.
Theory Of The Leisure Class
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Author : THORSTEIN. VEBLEN
language : en
Publisher:
Release Date : 2018
Theory Of The Leisure Class written by THORSTEIN. VEBLEN and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018 with categories.
Registries For Evaluating Patient Outcomes
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Author : Agency for Healthcare Research and Quality/AHRQ
language : en
Publisher: Government Printing Office
Release Date : 2014-04-01
Registries For Evaluating Patient Outcomes written by Agency for Healthcare Research and Quality/AHRQ and has been published by Government Printing Office this book supported file pdf, txt, epub, kindle and other format this book has been release on 2014-04-01 with Medical categories.
This User’s Guide is intended to support the design, implementation, analysis, interpretation, and quality evaluation of registries created to increase understanding of patient outcomes. For the purposes of this guide, a patient registry is an organized system that uses observational study methods to collect uniform data (clinical and other) to evaluate specified outcomes for a population defined by a particular disease, condition, or exposure, and that serves one or more predetermined scientific, clinical, or policy purposes. A registry database is a file (or files) derived from the registry. Although registries can serve many purposes, this guide focuses on registries created for one or more of the following purposes: to describe the natural history of disease, to determine clinical effectiveness or cost-effectiveness of health care products and services, to measure or monitor safety and harm, and/or to measure quality of care. Registries are classified according to how their populations are defined. For example, product registries include patients who have been exposed to biopharmaceutical products or medical devices. Health services registries consist of patients who have had a common procedure, clinical encounter, or hospitalization. Disease or condition registries are defined by patients having the same diagnosis, such as cystic fibrosis or heart failure. The User’s Guide was created by researchers affiliated with AHRQ’s Effective Health Care Program, particularly those who participated in AHRQ’s DEcIDE (Developing Evidence to Inform Decisions About Effectiveness) program. Chapters were subject to multiple internal and external independent reviews.
Crippling Leviathan
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Author : Melissa M. Lee Desfor
language : en
Publisher: Cornell University Press
Release Date : 2020-04-15
Crippling Leviathan written by Melissa M. Lee Desfor and has been published by Cornell University Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2020-04-15 with Political Science categories.
Policymakers worry that "ungoverned spaces" pose dangers to security and development. Why do such spaces exist beyond the authority of the state? Earlier scholarship—which addressed this question with a list of domestic failures—overlooked the crucial role that international politics play. In this shrewd book, Melissa M. Lee argues that foreign subversion undermines state authority and promotes ungoverned space. Enemy governments empower insurgents to destabilize the state and create ungoverned territory. This kind of foreign subversion is a powerful instrument of modern statecraft. But though subversion is less visible and less costly than conventional force, it has insidious effects on governance in the target state. To demonstrate the harmful consequences of foreign subversion for state authority, Crippling Leviathan marshals a wealth of evidence and presents in-depth studies of Russia's relations with the post-Soviet states, Malaysian subversion of the Philippines in the 1970s, and Thai subversion of Vietnamese-occupied Cambodia in the 1980s. The evidence presented by Lee is persuasive: foreign subversion weakens the state. She challenges the conventional wisdom on statebuilding, which has long held that conflict promotes the development of strong, territorially consolidated states. Lee argues instead that conflictual international politics prevents state development and degrades state authority. In addition, Crippling Leviathan illuminates the use of subversion as an underappreciated and important feature of modern statecraft. Rather than resort to war, states resort to subversion. Policymakers interested in ameliorating the consequences of ungoverned space must recognize the international roots that sustain weak statehood.