Results 251 to 260 of about 284,216 (291)

On the Arrival Angle of Microwaves

1949
This research describes a preliminary effort to measure the effect of the atmosphere on the refraction of microwaves. Variations in the structure of the lower atmosphere cause small changes in the index of refraction, and these small changes might alter the angle at which the wave front arrives at the receiver.
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COMSTAR and CTS angle-of-arrival measurements

Annales des Télécommunications, 1980
This brief note describes angle of arrival measurement made at Columbus, Ohio, USA, on 11.7 and 28.56 GHz earth-space paths. These measurements indicate that the short term deviation of the angle of arrival exceeds 0.1° for 0.01 percent of the time. Such a fluctuation would indicate that adverse effects may be expected for receiving apertures having ...
R. A. Baxter, D. M. J. Devasirvatham, B. W. Kwan, D. B. Hodge   +3 more
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Angle of arrival detection by ESPRIT method

2017 International Conference on Communication and Signal Processing (ICCSP), 2017
The direction of arrival estimation of a signal impinging on a array of antennas is an important aspect in signal processing. In order to estimate the angle, we have to relay on a mathematical function known as “pseudospectrum”. This pseudospectrum estimation methods yields best results, when it is employed along with a superior working algorithm to ...
Pooja Gupta, Vijay Kumar Verma, Vijaydeep Senapati   +2 more
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RF angle of arrival-based node localisation

International Journal of Sensor Networks, 2011
Several localisation algorithms exist for wireless sensor networks that use angle of arrival measurements to derive node position. However, there are limited options for actually obtaining the angle of arrival using resource-constrained devices. In this paper, we describe a technique for determining node bearings based on radio interferometric angle of
Isaac Amundson, Janos Sallai, Xenofon Koutsoukos, Akos Ledeczi, Miklos Maroti   +4 more
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Angle-of-arrival estimation in atmospheric turbulence

The Journal of the Acoustical Society of America, 2005
An angle-of-arrival estimator is derived for acoustic waves that propagate in atmospheric turbulence. The estimator directly accounts for the effects of random fluctuations in the propagation environment. The first and second moments of the sound field, as derived from the theory of wave propagation in a random medium, and realistic atmospheric ...
Sandra Collier, Vladimir Ostashev, D. Keith Wilson   +2 more
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Interferometer Angle-of-Arrival Error Effects

2013
The angle error equations derived to this point have reflected only the error performance due to thermal noise effects. However, angle-of-arrival performance can be affected by various sources of error other than thermal noise. In this chapter, we focus on errors that affect angle accuracy as opposed to angle precision.
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Tropospheric Effects on Angle-of-Arrival

2013
In this chapter, we characterize the effects of angle bias due to refraction and angle precision due to turbulence. As a result, angle bias due to refraction can be calibrated and removed, if possible, and any residual error can be quantified in the interferometer angle error budget.
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Angle of Arrival Fluctuations (Image Motion)

2009
This excerpt gives a succinct explanation of the Angle of Arrival Fluctuations (Image Motion).
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Angle of arrival of ten centimeter microwaves

2012
The path of an electromagentic wave propagated through the earth's atmosphere depends upon the homogeneity of the atmosphere. For the well mixed condition, which is the case most of the time, the wave follows a straight or a smoothly curved path. However, if the atmosphere is not homogeneous, the wave may change direction abruptly along the path. It is
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Arrival, Angle Of

2008
Shashi Shekhar, Hui Xiong
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