Rubidium Atomic Clock The Workhorse Of Satellite Navigation

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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.

Rubidium Atomic Clock

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Author : BIKASH. SAXENA GHOSAL (G M.)
language : en
Publisher:
Release Date : 2019

Rubidium Atomic Clock written by BIKASH. SAXENA GHOSAL (G M.) and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2019 with Artificial satellites in navigation categories.

Rubidium Atomic Clock For Galileo

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Author :
language : en
Publisher:
Release Date : 1999

Rubidium Atomic Clock For Galileo written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1999 with categories.

The overall performance of navigation payloads is dependent on the performance of the on-board clocks. Better stability leads directly to improved space segment autonomy and simplified ground segment operation. The European Space Agency supports the development of advanced atomic clocks in the frame of its Technology Demonstration Program and more recently under the GNSS-2 program. Two major activities are currently running with the aim fully space-qualifying a Rubidium Atomic Frequency Standard (RAFS) and a Space Hydrogen Maser (SHM). The development activity for the Rubidium clocks is driven by the following major design goals: * Mass

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.

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.

The Rubidium Atomic Clock And Basic Research

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Author :
language : en
Publisher:
Release Date : 2007

The Rubidium Atomic Clock And Basic Research written by and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2007 with categories.

The vapor-cell atomic clock finds application today in the global positioning system and telecommunications. To improve and miniaturize the humble device for future applications will require a deeper understanding of atomic and chemical physics.

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.

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.

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.

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.