Long Term Ground Test Results For Two Gps Block Iir Rubidium Clocks
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Long Term Ground Test Results For Two Gps Block Iir Rubidium Clocks
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Author : Ronald L. Beard
language : en
Publisher:
Release Date : 2000
Long Term Ground Test Results For Two Gps Block Iir Rubidium Clocks written by Ronald L. Beard and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2000 with Aids to navigation categories.
The rubidium clock used in the GPS Block IIR space vehicles is a design that had not flown previously in space.
Early In Orbit Performance Of Gps Block Iir Rubidium Clocks
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Author :
language : en
Publisher:
Release Date : 1997
Early In Orbit Performance Of Gps Block Iir Rubidium Clocks 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.
The first Block IIR GPS navigation satellite, placed in orbit on July 22, 1997, carried a new generation of rubidium clocks. Since then, two of these clocks have been activated, and both are performing well. This paper reports on those early results, and compares the in-orbit performance with ground acceptance test data. EG & G has delivered about two-thirds of the 66 Rubidium Atomic Frequency Standards (RAFS) needed for the Block IIR GPS program Composite frequency and time stability plots are presented for all delivered units, and more detailed acceptance test stability data shown for the two RAFS that are operating on-board SVN43. In addition, similar life test data shown for the two units that are undergoing life testing at NRL. In-orbit stability and drift data are presented for RAFS S/N 005 and 006 using all available 15-minute precise ephemeris/clock data from the National Imagery and Mapping Agency (NIMA). RAFS S/N 006 was turned on 8/13/97 and was used as the active clock until 9/26/97. RAFS S/N 005 was turned on 8/22/97 and became the active clock on 9/26/97 at the beginning of a 2-month extended navigation test. Both are showing excellent stability and early drift stabilization.
Gps Block Iir Rubidium Atomic Frequency Standard Life Test
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Author :
language : en
Publisher:
Release Date : 1998
Gps Block Iir Rubidium Atomic Frequency Standard Life Test written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1998 with categories.
The rubidium clocks in the GPS Block IIR spacecraft have no previous flight experience, and will be the only atomic clocks used on the Block IIR satellites. The U.S. Naval Research Laboratory (NRL),) in cooperation with the Global Positioning System Joint Program Office (GPS-JPO), the GPS control Segment, Lockheed Martin, ITT, and EC & G, is conducting a three year life-test of two flight qualfied EG & G Rubidium Atomic Frequency Standards (RAFS) selected from the operational spacecraft inventory. The two RAFS, serial numbers 28 and 30, were selected as representative of the flight configuration build for Block IIR by ITT and provided by the JPO to NRL for this test. The test is intended to build confidence in these units as operational spacecraft clocks and establish a database of fundamental performance characteristics. The two units are being operated in independent thermal vacuum chambers with high resolution monitoring of the clock's frequency compared to the NRL hydrogen maser references. The units' internal monitors that would normally be sent as telemehy and environmental test conditions are monitored and recorded with high resolution. Output from one of the two units has been used as input to the NRL Time Keeping System Simulator (TKSS). The TKSS was originally built to evaluate the implementation and algorithms used in the Block IIR on-board Time Keeping System (TKS), which determines the satellite's clock signal to the transmitter. Data from the TKSS have been used to evaluate TKS on-orbit performance and serve as an analysis reference. RAFS data from the beginning of the test on 31 March 1997 to August 1998 and representative TKSS data will be presented. Frequency stability results of the RAFS have routinely shown Allan deviation performance in parts in 10( -14) at one day, much better than initially expected.
Springer Handbook Of Global Navigation Satellite Systems
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Author : Peter Teunissen
language : en
Publisher: Springer
Release Date : 2017-06-16
Springer Handbook Of Global Navigation Satellite Systems written by Peter Teunissen and has been published by Springer this book supported file pdf, txt, epub, kindle and other format this book has been release on 2017-06-16 with Science categories.
This Handbook presents a complete and rigorous overview of the fundamentals, methods and applications of the multidisciplinary field of Global Navigation Satellite Systems (GNSS), providing an exhaustive, one-stop reference work and a state-of-the-art description of GNSS as a key technology for science and society at large. All global and regional satellite navigation systems, both those currently in operation and those under development (GPS, GLONASS, Galileo, BeiDou, QZSS, IRNSS/NAVIC, SBAS), are examined in detail. The functional principles of receivers and antennas, as well as the advanced algorithms and models for GNSS parameter estimation, are rigorously discussed. The book covers the broad and diverse range of land, marine, air and space applications, from everyday GNSS to high-precision scientific applications and provides detailed descriptions of the most widely used GNSS format standards, covering receiver formats as well as IGS product and meta-data formats. The full coverage of the field of GNSS is presented in seven parts, from its fundamentals, through the treatment of global and regional navigation satellite systems, of receivers and antennas, and of algorithms and models, up to the broad and diverse range of applications in the areas of positioning and navigation, surveying, geodesy and geodynamics, and remote sensing and timing. Each chapter is written by international experts and amply illustrated with figures and photographs, making the book an invaluable resource for scientists, engineers, students and institutions alike.
Nrl Gps Bibliography
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Author : Robert R. Whitlock
language : en
Publisher:
Release Date : 2009
Nrl Gps Bibliography written by Robert R. Whitlock and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2009 with Artificial satellites in navigation categories.
Rubidium Atomic Frequency Standards For Gps Block Iir
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Author :
language : en
Publisher:
Release Date : 1990
Rubidium Atomic Frequency Standards For Gps Block Iir written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1990 with categories.
EG & G, Inc. has been selected to provide the Rubidium Atomic Frequency Standards (RAFS) for the GPS Block IIR NAVSTAR satellites. These satellites will replenish and upgrade the space segment of the Global Positioning System in the mid 1990s. The EG & G GPS RAFS Rb clocks are the latest generation of the high-performance rubidium frequency standards described at this conference in 1981, 1983, 1985, and 1987. They offer an aging rate in the low pp10(14)/day range and a drift-corrected 1-day stability in the low pp10(14) range. The Block IIR version of these devices will have improved performances, higher reliability, smaller size, and greater radiation hardness. The GPS Block IIR atomic clocks have a "natural frequency" configuration whereby they output a frequency of about 13.4 MHz that is a submultiple of the atomic resonance of Rb (or Cs). The RAFS operates at a low, fixed C-field for increased stability. The unit has been repackaged into a smaller 4.6" x 8.5" x 5.8" outline, but is somewhat heavier (12 lbs.) because of additional radiation shielding. Elimination of the ground tuning logic and the secondary loop synthesizer (with its ovenized crystal oscillator) has reduced the RAFS complexity and improved its reliability to 0.80 for the 7.5-year mission. The RAFS power consumption is only 13 W at +20 deg. C in vacuum. This paper describes the GPS Block IIR RAFS design, including the changes and improvements made, and the test results obtained, since the last report at this conference in 1987.
Test Results For Prototype Gps Global Positioning System Rubidium Clocks
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Author :
language : en
Publisher:
Release Date : 1984
Test Results For Prototype Gps Global Positioning System Rubidium Clocks written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1984 with categories.
This paper presents the results of a series of stability and qualification-level environmental and performance tests on two prototype rubidium frequency standards for the GPS navigation satellite program.
Government Reports Announcements Index
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Author :
language : en
Publisher:
Release Date : 1991
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 1991 with Government publications categories.
Electrical Electronics Abstracts
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Author :
language : en
Publisher:
Release Date : 1997
Electrical Electronics Abstracts 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 Electrical engineering categories.
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.