quadrature


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Related to quadrature: Quadrature amplitude modulation, Quadrature formula

quadrature,

in astronomy, arrangement of two celestial bodies at right angles to each other as viewed from a reference point. If the reference point is the earth and the sun is one of the bodies, a planet is in quadrature when its elongationelongation,
in astronomy, the angular distance between two points in the sky as measured from a third point. The elongation of a planet is usually measured as the angular distance from the sun to the planet as measured from the earth.
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 is 90°. As viewed from the earth, the half-moon is in quadrature to the sun. The inferior planets (Mercury and Venus) never reach quadrature; the superior planets each have two points of quadrature in their orbits.

quadrature

(kwod -ră-cher) The position, or aspect, of a body in the Solar System when its elongation from the Sun, as measured from the Earth, is 90°, i.e. when the angle Sun–Earth–body is a right angle.

quadrature

[′kwä·drə·chər]
(astronomy)
The right-angle physical alignment of the sun, moon, and earth.
(mathematics)
The construction of a square whose area is equal to that of a given surface.
The process of calculating a definite integral.
(physics)
State of being separated in phase by 90°, or one quarter-cycle. Also known as phase quadrature.
References in periodicals archive ?
A Kronrod extension of Gauss-Turan quadrature formula.
Dash [5] have constructed two Mixed quadrature rules, i,e [SM.
In this paper, using the algebraic Gaussian quadrature rule for the weight function (1.
As observed previously in [9, 16], this reinforces the role of integral representations and quadrature in the matrix functions computation problem.
Designed for use in the transmit section of communications systems, the dual channels offered by the DAC290x are ideal for quadrature modulated signal conversion by providing simultaneous processing and excellent I/Q channel matching.
Most option pricing models and techniques employed by today's analysts are rooted in the Black-Scholes model, but analysts are now moving beyond this established model to quadrature mathematics: numerical calculation under a curve or, more generally, using numerical integration to calculate a definite integral.
Finally, we establish a parametric quadrature model based on the presented inequality and obtain its error bounds.
Hanzo (electronics and computer science, University of Southampton, UK) overviews major single- and multi-carrier quadrature amplitude modulation (QAM) techniques in this reference for senior undergraduate and postgraduate students as well as practicing engineers and researchers.
The RSP is a re-configurable numeric preprocessor that performs digital tuning, quadrature mixing, channel select filtering and data decimation.
Direct-downconverting quadrature mixers driven by an on-chip fractional PLL synthesizer deliver baseband in-phase and quadrature signals to a variable-gain amplifier (VGA) and programmable low-pass filter stages with dc offset correction.
The quadrature formulas are interpolatory and therefore the degree of exactness is at least n.
98 MHz, and features hardware DMA, quadrature decoder, up to 35 GPIO lines shared with up to five serial ports, and four levels of alternate pin functions.