A Rubidium Clock For Gps
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Rubidium Atomic Clock The Workhorse Of Satellite Navigation
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Author : G M Saxena
language : en
Publisher: World Scientific
Release Date : 2020-03-05
Rubidium Atomic Clock The Workhorse Of Satellite Navigation written by G M Saxena and has been published by World Scientific this book supported file pdf, txt, epub, kindle and other format this book has been release on 2020-03-05 with Science categories.
The Rubidium atomic clock (Rb) is the workhorse of the satellite navigation systems of which GPS is now a household name. With just the tap of a few keys, drivers and navigators all over the world are able to reach their destination effortlessly with high precision. People are now curious to know what makes this possible. Hence, the need to explain in simplistic terms the Rb atomic clocks that are onboard these satellite navigation systems because no good satellite navigation system is possible without such clocks.But why only Rb atomic clocks when far better and exotic atomic clocks are available? The reasons are as simple as that they are slim, low in weight, easy to build inexpensively. They are also used in numerous military applications such as secure communications, electronic warfare, command and control, telemetry and navigation. Besides, they are used in the measurements of the variation in fine-structure constant, test of relativity, precise spectroscopy and scientific research.This book details the history of time keeping and the chronological development of the Rb atomic clocks, with special focus on the physics Package that accounts for the actual performance of the clock. Researchers and industrialists will find that producing such clocks is relatively simple and inexpensive.
A Rubidium Clock For Gps
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Author :
language : en
Publisher:
Release Date : 1981
A Rubidium Clock For Gps written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1981 with categories.
The work at EG&G, Inc. on a second-source rubidium frequency standard for use in the GPS navigation satellites has now reached the prototype stage. This paper describes (1) the design objectives and approach, (2) the more important design features, (3) the signal parameters and error budget, and (4) the early results of this program up to the present.
Impact Of Rubidium Clock Aiding On Gps Augmented Vehicular Navigation
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Author : Zhaonian Zhang
language : en
Publisher:
Release Date : 1997
Impact Of Rubidium Clock Aiding On Gps Augmented Vehicular Navigation written by Zhaonian Zhang 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.
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.
Impact Of Rubidium Clock Aiding On Gps Augmented Vehicular Navigation
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Author :
language : en
Publisher:
Release Date : 1998
Impact Of Rubidium Clock Aiding On Gps Augmented Vehicular Navigation 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.
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.
Integration Of The Global Positioning System With A Rubidium Clock And A Barometer For Land Vehicle Navigation
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Author : Zhaonian Zhang
language : en
Publisher:
Release Date : 1997
Integration Of The Global Positioning System With A Rubidium Clock And A Barometer For Land Vehicle Navigation written by Zhaonian Zhang and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1997 with Artificial satellites in navigation categories.
Further Test Results For Prototype Gps Rubidium Clocks
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Author :
language : en
Publisher:
Release Date : 1985
Further Test Results For Prototype Gps 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 1985 with categories.
This paper presents the results of further stability and qualification-level environmental tests on two prototype rubidium frequency standards for the GPS navigation satellite program. One unit was subjected to a 140-day thermovac stability retest that confirmed the efficacy of two improvements that reduce frequency drift and frequency and light intensity fluctuations. The observed drift was -1.4 x 10( -14)/day and the stability was 6 x 10( -14) at 10(5) seconds. This was accomplished by using an absorption cell made from glass having low helium permeability and a lamp having a lower (normal) rubidium fill. The other unit was successfully subjected to qualification levels of thermal, mechanical and EMI retesting. Several electrical, high temperature, and mechanical problems associated with the ovenized crystal oscillator were corrected. Improved design and filtering of the control/monitor cable and power supply satisfactorily resolved several EMI problems.
Frequency Equilibration And The Light Shift Effect For Block Iir Gps Rubidium Clocks
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Author :
language : en
Publisher:
Release Date : 2004
Frequency Equilibration And The Light Shift Effect For Block Iir Gps 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 2004 with categories.
Over the past several years, evidence has grown indicating that rubidium (Rb) vapor-cell frequency standards exhibit a long "frequency equilibration" period following activation. Though frequency equilibration can have important implications for diverse timekeeping systems, the mechanism driving the behavior is not well understood and has been the subject of debate. Here, we investigate this phenomenon, as well as frequency aging, for a number of Block IIR GPS Rb clocks. Consistent with previous work, we find that all six Rb clocks in the study showed a frequency equilibration phenomenon with time constants ranging from 98 to 584 days. Further, all clocks displayed a strong correlation between clock frequency and light intensity during equilibration. Significantly, five of the GPS clocks displayed small light-intensity jumps (~ 0.3%) that could be correlated with small jumps in clock fractional frequency (~ 3x10-13); these were used to estimate the various clocks' light-shift coefficients. The broad range of equilibration time constants and the light-shift coefficient determinations cast doubt on the two mechanisms most often cited to explain frequency equilibration: helium permeation through the resonance cell's glass envelope, and the intensity-dependent light-shift effect. Additionally, the light-shift coefficient determinations cast doubt on the intensity-dependent light-shift effect as the driver of frequency aging.
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.