On The Use Of Precision Frequency Signals In Space
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On The Use Of Precision Frequency Signals In Space
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Author : William E. Frye
language : en
Publisher:
Release Date : 1960
On The Use Of Precision Frequency Signals In Space written by William E. Frye and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1960 with categories.
The advent of very stable and accurate frequency sources and the development of means for improving receiver sensitivity make attractive the use of such devices as an aid to navigation and guidance in many astronautical missions. This paper reviews the application of Doppler principles and techniques to operations of earth satellites in terrestrial space, in the areas of orbit determination and use as a navaid. A radio navigation aid for lunar and interplanetary missions which employs precision frequency sources and fixed antenna beams is described. A configuration for the navaid utilizing earth and planetary satellites is proposed. (Author).
Radio Frequency Control In Space Telecommunications
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Author : Library of Congress. Legislative Reference Service
language : en
Publisher:
Release Date : 1960
Radio Frequency Control In Space Telecommunications written by Library of Congress. Legislative Reference Service and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1960 with Astronautics categories.
Modern Radio Signals Filtering Devices Methods Technologies Structures
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Author : Grigory M. ARISTARKHOV, Yuri V. GULYAEV, Valery F. DMITRIEV, Vyacheslav V. KOMAROV, Valery P. MESHCHANOV, Kirill V. ZAICHENKO
language : en
Publisher: Bentham Science Publishers
Release Date : 2024-02-09
Modern Radio Signals Filtering Devices Methods Technologies Structures written by Grigory M. ARISTARKHOV, Yuri V. GULYAEV, Valery F. DMITRIEV, Vyacheslav V. KOMAROV, Valery P. MESHCHANOV, Kirill V. ZAICHENKO and has been published by Bentham Science Publishers this book supported file pdf, txt, epub, kindle and other format this book has been release on 2024-02-09 with Science categories.
This comprehensive book covers spectral analysis theory for radio signals and innovative devices designed for filtering electromagnetic waves across diverse frequency ranges. The book features 14 chapters that explain the working of devices utilizing surface and bulk acoustic waves. The chapters provide insights into acousto-optical and acousto-electronic Fourier processors' design principles, description methods, and characteristics. The inclusion of algorithms for multi-channel frequency discriminators enhances the precision of radio signal frequency measurements, ensuring stability in tracking frequency meters amidst intense interference. The book also includes mathematical modeling and experimental studies of waveguide microwave filters and X-band multiplexers, specifically tailored for non-pressurized radio electronic equipment in space communication systems. Notably, the book introduces readers to a compelling alternative to conventional filters: 2-D periodic structures in the form of thin perforated metal meshes that offer compact solutions for millimeter and sub-millimeter wave systems. A significant portion of the book is dedicated to the development of highly selective microstrip filters, incorporating complex topological structures with limited resonators and numerous couplings. This approach allows for the formation of numerous attenuation poles at finite frequencies, facilitating the achievement of high electrical parameters and compact filter sizes. Engineers and scientists specializing in communication systems design and analog Fourier processors will find a wealth of well-established and original solutions within this book.
Application Of High Stability Oscillators To Radio Science Experiments Using Deep Space Probes
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Author :
language : en
Publisher:
Release Date : 1990
Application Of High Stability Oscillators To Radio Science Experiments Using Deep Space Probes 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.
The microwave telecommunication links between the earth and deep space probes have long been used to conduct radio science experiments which take advantage of the phase coherency and stability of these links. These experiments measure changes in the phase delay of the signals to infer electrical, magnetic and gravitational properties of the solar system environment and beyond through which the spacecraft and radio signals pass. The precision oscillators, from which the phase of the microwave signals are derived, play a key role in the stability of these links and therefore the sensitivity of these measurements. These experiments have become a driving force behind recent and future improvements in the Deep Space Network and spacecraft oscillators and frequency and time distribution systems. Three such experiments which are key to these improvements are briefly discussed here and the relationship between their sensitivity and the signal phase stability is described. The first is the remote sensing of planetary atmospheres by occultation in which the radio signal passes through the atmosphere and is refracted causing the signal pathlength to change from which the pressure and the temperature of the atmosphere can be derived. The second experiment is determination of the opacity of planetary rings by passage of the radio signal through the rings. Because the signal is coherent, the diffraction effects can be removed resulting in resolutions of 10's to 100's of meters in the radial direction depending on a number of factors including the coherence time of the microwave signal. The third experiment is the search for very low frequency gravitational radiation. The fractional frequency variation of the signal is comparable to the spatial strain amplitude the system is capable of detecting. A summary of past results and future possibilities for these experiments are presented.
An Assessment Of Precision Time And Time Interval Science And Technology
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Author : National Research Council
language : en
Publisher: National Academies Press
Release Date : 2002-12-04
An Assessment Of Precision Time And Time Interval Science And Technology written by National Research Council and has been published by National Academies Press this book supported file pdf, txt, epub, kindle and other format this book has been release on 2002-12-04 with Science categories.
Knowledge of time is essential to precise knowledge of location, and for this reason the Navy, with its need to navigate on the high seas, has historically played an important role in the development and application of advanced time realization and dissemination technologies. Discoveries coming from basic research funded by the Office of Naval Research (ONR) lie at the heart of today's highest performance atomic clocks, Naval Research Laboratory (NRL) expertise played a role in developing the space-qualified atomic clocks that enable the Global Positioning System (GPS), and the U.S. Naval Observatory (USNO) maintains and disseminates the standard of time for all of the Department of Defense (DOD). The Navy has made major investments in most aspects of precision time and time interval (PTTI) science and technology, although specific PTTI-related research has also been funded by the Defense Advanced Research Projects Agency (DARPA) and non-DOD agencies such as the National Science Foundation (NSF), the National Aeronautics and Space Administration (NASA), and the Department of Commerce. Navy funding, largely through ONR, has a history of being an early enabler of key new developments. Judicious funding decisions by the Navy-particularly by ONR program officers-have underpinned most of the major advances in PTTI science and technology (S&T) in the last 50 years. PTTI is important to modern naval needs, and indeed to all the armed Services, for use in both navigation and communications. Precise time synchronization is needed to efficiently determine the start of a code sequence in secure communications, to perform navigation, and to locate the position of signal emitters. Precise frequency control is required in communications for spectrum utilization and frequency-hopped spread-spectrum techniques. There are many examples of essential military operations that depend on PTTI and could benefit from improvements in PTTI technology. These include: -GPS clocks and autonomous operations, -Weapon system four-dimensional coordination, -GPS antijamming, -Network-centric warfare, and -Secure military communications. This report summarizes that reductions in the size, weight, and power requirements and increases in the ruggedness of PTTI devices without sacrificing performance would put more accurate and precise timekeeping in the hands of the warrior, improving capabilities in all of the above operations.
System Of Communication With Interplanetary Space Vehicles
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Author : Yu K. Khodarev
language : en
Publisher:
Release Date : 1968
System Of Communication With Interplanetary Space Vehicles written by Yu K. Khodarev and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1968 with categories.
A communications system used during deep-space probes (Zond, Mars, and Venera) is described. The equipment in the Deep-Space Communications Center (usually one point) provides communications for all deep-space probes. Communication is periodic and scheduled. When the interval between communication-exchange sequences is long enough (15 days), receiver tuning problems arise because of the Doppler frequency shift and signal delay. To avoid these problems, deep-space communications systems in the USSR have a programmed control for correcting the ground-based transmitter and receiver (heterodyne) frequencies. This control uses the real-time parameters from the space-flight trajectory and velocity. The control system determines the difference between measured and predicted system frequency and signal-delay time. The accuracy of the frequency control is about 0.25 Hz with a phase shift of 1--2 degrees, and the accuracy of signal-delay time is 1--2 msec. A noncoherent detector is used in the space receiver because the ground transmitter imparts about 100 kw of power to the antenna. The ground receiver has a coherent receiver, and the message from space is modulated by a code-FM-PM or code PM-PM system. Practical use of the communication system described shows that it provides communication without additional receiver-frequency adjustment and is recommended for use in deep-space communications. (Author).
Optimum Frequencies For Outer Space Communications
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Author : United States. Army. Signal Corps. Radio Frequency Engineering Office
language : en
Publisher:
Release Date : 1958
Optimum Frequencies For Outer Space Communications written by United States. Army. Signal Corps. Radio Frequency Engineering Office and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1958 with Astronautics categories.
Shuttle Time And Frequency Transfer Experiment
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Author : National Aeronautics and Space Administration (NASA)
language : en
Publisher: Createspace Independent Publishing Platform
Release Date : 2018-08-14
Shuttle Time And Frequency Transfer Experiment written by National Aeronautics and Space Administration (NASA) and has been published by Createspace Independent Publishing Platform this book supported file pdf, txt, epub, kindle and other format this book has been release on 2018-08-14 with categories.
A proposed space shuttle experiment to demonstrate techniques for global high precision comparison of clocks and primary frequency standards is described. The experiment, using transmitted microwave and pulsed laser signals, compared a hydrogen maser clock onboard the space shuttle with a clock in a ground station in order to demonstrate time transfer with accuracies of 1 nsec or better and frequency comparison at the 10 to the -14th power accuracy level. Allan, D. W. and Alley, C. O. and Decher, R. and Vessot, R. F. C. and Winkler, G. M. R. Marshall Space Flight Center NASA-TM-78288 ...
An Assessment Of Precision Time And Time Interval Science And Technology
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Author : National Research Council
language : en
Publisher:
Release Date : 2002-11
An Assessment Of Precision Time And Time Interval Science And Technology written by National Research Council and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 2002-11 with categories.
Knowledge of time is essential to precise knowledge of location, and for this reason the Navy, with its need to navigate on the high seas, has historically played an important role in the development and application of advanced time realization and dissemination technologies. Discoveries coming from basic research funded by the Office of Naval Research (ONR) lie at the heart of today's highest performance atomic clocks, Naval Research Laboratory (NRL) expertise played a role in developing the space-qualified atomic clocks that enable the Global Positioning System (GPS), and the U.S. Naval Observatory (USNO) maintains and disseminates the standard of time for all of the Department of Defense (DOD). The Navy has made major investments in most aspects of precision time and time interval (PTTI) science and technology, although specific PTTI-related research has also been funded by the Defense Advanced Research Projects Agency (DARPA) and non-DOD agencies such as the National Science Foundation (NSF), the National Aeronautics and Space Administration (NASA), and the Department of Commerce. Navy funding, largely through ONR, has a history of being an early enabler of key new developments. Judicious funding decisions by the Navy-particularly by ONR program officers-have underpinned most of the major advances in PTTI science and technology (S&T) in the last 50 years. PTTI is important to modern naval needs, and indeed to all the armed Services, for use in both navigation and communications. Precise time synchronization is needed to efficiently determine the start of a code sequence in secure communications, to perform navigation, and to locate the position of signal emitters. Precise frequency control is required in communications for spectrum utilization and frequency-hopped spread-spectrum techniques. There are many examples of essential military operations that depend on PTTI and could benefit from improvements in PTTI technology. These include: -GPS clocks and autonomous operations, -Weapon system four-dimensional coordination, -GPS antijamming, -Network-centric warfare, and -Secure military communications. This report summarizes that reductions in the size, weight, and power requirements and increases in the ruggedness of PTTI devices without sacrificing performance would put more accurate and precise timekeeping in the hands of the warrior, improving capabilities in all of the above operations.
Xith International Astronautical Congress Stockholm 1960
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Author : C.W.P. Reuterswärd
language : en
Publisher: Springer Science & Business Media
Release Date : 2013-06-29
Xith International Astronautical Congress Stockholm 1960 written by C.W.P. Reuterswärd and has been published by Springer Science & Business Media this book supported file pdf, txt, epub, kindle and other format this book has been release on 2013-06-29 with Technology & Engineering categories.