Refraction Attenuation And Backscattering Of Electromagnetic Waves In The Troposphere
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Refraction Attenuation And Backscattering Of Electromagnetic Waves In The Troposphere
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Author : V. J. Falcone
language : en
Publisher:
Release Date : 1970
Refraction Attenuation And Backscattering Of Electromagnetic Waves In The Troposphere written by V. J. Falcone and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1970 with Backscattering categories.
Refraction Attenuation And Backscattering Of Electromagnetic Waves In The Troposphere
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Author : V. J. Falcone
language : en
Publisher:
Release Date : 1970
Refraction Attenuation And Backscattering Of Electromagnetic Waves In The Troposphere written by V. J. Falcone and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1970 with categories.
Refraction Attenuation And Backscattering Of Electromagnetic Waves In The Troposphere
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Author : V. J. Falcone (jr)
language : en
Publisher:
Release Date : 1970
Refraction Attenuation And Backscattering Of Electromagnetic Waves In The Troposphere written by V. J. Falcone (jr) and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1970 with categories.
Refraction Attenuation And Backscattering Of Electromagnetic Waves In The Troposphere
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Author : V. J. Falcone
language : en
Publisher:
Release Date : 1970
Refraction Attenuation And Backscattering Of Electromagnetic Waves In The Troposphere written by V. J. Falcone and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1970 with Electromagnetic waves categories.
Optical Turbulence Forecasting
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Author : Edmond M. Dewan
language : en
Publisher:
Release Date : 1980
Optical Turbulence Forecasting written by Edmond M. Dewan and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1980 with Atmospheric turbulence categories.
This report is a tutorial on the effects of atmospheric turbulence upon systems which rely upon the propagation of LASER beams. In addition to providing a simplified presentation of turbulence theory and optical effects, it describes the state of the art of the new technique of radiosonde estimation of index of refraction fluctuations. Suggestions are given for future research which will help to answer current Air Force needs. The feasibility of some laser systems will depend upon the value of r0, the coherence length (which is related to “C2n” which in turn is related to the degree of turbulence). At present, the statistics of “r0” are inadequate.
Pointing Calibration Of A High Resolution Millimeter Wave Antenna By Star Observations
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Author : Melvin Burak
language : en
Publisher:
Release Date : 1971
Pointing Calibration Of A High Resolution Millimeter Wave Antenna By Star Observations written by Melvin Burak and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1971 with Antennas (Electronics) categories.
An extensive pointing calibration program for the drive system and mount of the AFCRL 29-ft millimeter-wave antenna is described. The optical pointing accuracy was determined by measuring the positioning errors of the optical axis of the antenna. Since all sources of optical pointing errors produce equivalent RF errors, all RF errors except those produced by feed system and reflector asymmetry are determined. A brief description of the antenna together with the integrated IBM 1800 data aquisition and control system, tracking software, and an accurate time-synchronization method are presented. The star tracking program, which includes a method of star selection, precession correction, and refraction correction, is described. The analysis and derivation of the various pointing error parameters used to determine the best-fitting functions that characterize the positional errors are presented. Next, the star data are reduced by fitting the nightly error measurements to the best-fitting error function from which the values of the error parameters that take into account the servo, collimation, azimuth plane tilt, elevation axis skewness, and residual refraction are determined. Finally, the results of the star data analysis and statistical data are presented. The rms residual optical pointingg error, after pointin calibration, averaged about 3 percent of the antenna beamwidth, that is, 7.5 arc seconds in both azimuth and elevation. (Author).
Scientific And Technical Aerospace Reports
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Author :
language : en
Publisher:
Release Date : 1994
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 1994 with Aeronautics categories.
Techniques For Computing Refraction Of Radio Waves In The Troposphere
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Author : E. J. Dutton
language : en
Publisher:
Release Date : 1961
Techniques For Computing Refraction Of Radio Waves In The Troposphere written by E. J. Dutton and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1961 with Atmospheric radio refractivity categories.
Eight methods of computing atmospheric refraction of radio rays are discussed with appropriate theoretical background. These methods are: (1) The high-angle, or astronomical, refraction case; (2) The statistical method; (3) The low-angle, or terrestrial, refraction case (Schulkin's method); (4) The four-thirds earth model; (5) The exponential model; (6) The initial gradient correction method; (7) The departures-from-normal method; (8) A graphical method (Weisbrod's and Anderson's method). Sample computations are included for each of the above methods.
Techniques For Measuring Liquid Water Content Along A Trajectory
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Author : Rosemary M. Dyer
language : en
Publisher:
Release Date : 1981
Techniques For Measuring Liquid Water Content Along A Trajectory written by Rosemary M. Dyer and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1981 with Airplanes, Military categories.
The standard procedure for estimating the point value of liquid water content (M) along the reentry path of a ballistic missile is to use a radar derived value of radar reflectivity factor (Z), with the M to Z relation obtained from aircraft measurements of the particle spectrum. This report contains descriptions of the various techniques used to make the radar and aircraft data compatible. The results of various methods to predict the liquid water content values are compared with aircraft measured values. The extrapolation of instrumentally truncated aircraft measurements to include the entire range of particle sizes is treated in Section 1. Section 2 contains a discussion of the method of deriving nominal M-Z relations, applies the method to data acquired at Kwajalein Missile Range, and provides M-Z relations for rain, small snow, large snow, and bullet rosettes. The introduction of the factor 'k' to convert from aircraft measurements to radar derived values is also discussed in Section 2. The relationship of k with altitude and temperature for data from Kwajalein and Wallops Island is covered in Section 3. Finally, Section 4 contains a determination of the accuracy to which liquid water content can be estimated from climatological storm data for moderate to heavy stratiform winter storms at Wallops Island. The results of Section 4 demonstrate that situations which deviate significantly from climatological averages still require time- specific M-Z relations derived from simultaneous aircraft-radar measurements.
Atmospheric Transmission Handbook
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Author : William I. Thompson
language : en
Publisher:
Release Date : 1971
Atmospheric Transmission Handbook written by William I. Thompson and has been published by this book supported file pdf, txt, epub, kindle and other format this book has been release on 1971 with Atmosphere categories.