Determination of RF source reflection coefficients using step attenuator measurement technique

2012 ◽  
Author(s):  
Anton Widarta
Keyword(s):  
Measurement Technique ◽  
Reflection Coefficients

scholarly journals Determination of the Precise Coordinates of the GPS Reference Station in of a GBAS System in the Air Transport

2020 ◽  
Vol 22 (3) ◽  
pp. 11-18
Author(s):  
Kamil Krasuski ◽  
Stepan Savchuk
Keyword(s):  
Mathematical Model ◽  
Measurement Technique ◽  
Air Transport ◽  
Reference Station ◽  
The Real ◽  
Station Coordinates ◽  
Geocentric Coordinates

This paper presents results of research concerning determination of the GPS reference station coordinates located on the grounds of an EPDE airport in Deblin. The study uses a mathematical model of the PPP measurement technique in order to determine the coordinates of the reference station using the real GPS code-phase observations. The computations of the coordinates of the GPS reference station were carried out in numerical applications CSRS-PPP, APPS and GAPS. In this research was found that the accuracy of finding solutions to the XYZ geocentric coordinates of the reference station REF1 between solutions CSRS-PPP, APPS and GAPS ranges from 0.01m to 0.13m. In addition, the accuracy of determining the XYZ geocentric coordinates from the PPP method related to the GPS differential solution ranged from 0.01m to 0.11m.

Calculation of Optical Characteristics for Si1-xGExAlloy

1995 ◽  
Vol 379 ◽  
Author(s):  
V. G. Litovchenkoe ◽  
S. I. Frolov ◽  
B. N. Shkarban ◽  
D. Kruger
Keyword(s):  
Crystal Lattice ◽  
Mechanical Stress ◽  
Measurement Technique ◽  
Lattice Strain ◽  
Uniaxial Stress ◽  
Material Composition ◽  
Optical Transitions ◽  
Virtual Crystal Approximation ◽  
Pseudopotential Theory

ABSTRACTIn the framework of virtual crystal approximation using the empirical pseudopotential theory optical transitions of Si1 -xGexhave been calculated. The effects of hydrostatic and uniaxial stress, and alloy stoichiometry on the optical gaps were investigated. Since the mechanical stress and material composition affect the distinctive behaviour of different optical transitions it allows to put forward a spectral measurement technique for determination of crystal lattice strain and alloy parameter x simultaneously.

scholarly journals Measuring Displacements in Engineering Structures by Means of a Coordinate Laser Station

2016 ◽  
Vol 23 (4) ◽  
pp. 145-160 ◽  
Author(s):  
Jacek Sztubecki ◽  
Adam Bujarkiewicz ◽  
Małgorzata Sztubecka
Keyword(s):  
Measurement Technique ◽  
Civil Engineering ◽  
Direct Drive ◽  
Engineering Structures ◽  
Total Station ◽  
3 Dimensional ◽  
Dimensional Measurements ◽  
Civil Engineering Structures ◽  
Definition Of

Abstract The application of geodetic methods to examine structures consists in the determination of their displacements relative to an established geodetic reference datum or in the definition of the geometry of their individual components. Such examinations form a picture of changes happening between specific points in time. Modern measurement technologies used in geodetic engineering enable undertaking more and more challenging measurements with increasing accuracy. The purpose of this article is to present a measurement technique involving a Leica TDRA 6000 total station to measure displacements in engineering structures. The station features a direct drive technology to achieve an accuracy of 0.25 mm in 3-dimensional measurements. Supported by appropriate software, the unit makes a perfect instrument for the monitoring of civil engineering structures. The article presents the results of measurement of static and dynamic displacements in a few engineering structures. The measurements were carried out both in laboratory conditions and on actual, operated civil engineering structures.

On: “Special Report of the Subcommittee on Polarity Standards” by Ben B. Thigpen, A. E. Dalby, and Ralph Landrum (GEOPHYSICS, August 1975, p. 694–699)

Geophysics ◽  
1976 ◽  
Vol 41 (2) ◽  
pp. 324-324
Author(s):  
W. T. Valenta
Keyword(s):  
Reflection Coefficient ◽  
Compressional Wave ◽  
Velocity Versus ◽  
Reflection Coefficients ◽  
Special Report ◽  
Sonic Logs ◽  
The Relationship

In their report, the authors recommend that the arrival of a compressional wave at a geophone or hydrophone shall ultimately produce a trough (downward or leftward kick) on a seismogram; but they don’t say why. On sonic logs and displays of velocity versus time, velocity increases are up; likewise for density increases on density logs; likewise for positive reflection coefficients on reflection coefficient logs computed from the previously mentioned logs. Should not seismograms, which ideally are bandlimited reflection coefficient logs, conform to the same convention? The committee succeeded in the objectives of establishing the relationship between impulse‐source systems and vibratory‐source systems and of establishing tests for the determination of the polarity of a given system. I feel strongly that the committee should recommend that a compressional arrival shall produce a peak on a seismogram.

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