Results 171 to 180 of about 333,204 (200)

On the Origin of Planar Covariation of Elevation Angles During Human Locomotion

Journal of Neurophysiology, 2008
Leg segment rotations in human walking covary, so that the three-dimensional trajectory of temporal changes in the elevation angles lies close to a plane. Recently the role of central versus biomechanical constraints on the kinematics control of human locomotion has been questioned.
Ivanenko Y. P., D'Avella A., Poppele R. E., LACQUANITI, FRANCESCO   +3 more
openaire   +3 more sources

THE VARIATION OF REFRACTION WITH ELEVATION ANGLE IN AN ARID CLIMATE

Survey Review, 1970
AbstractAt the Woomera Rocket Range, thermoelectric equipment is used to monitor the air temperature gradient in the lower atmosphere so that the effects of atmospheric refraction on optical instrumentation can be allowed for.Using temperature profiles measured at Woomera the variation of refraction with elevation angle on sightlines over arid country ...
openaire   +1 more source

An application of the monopulse principle to determining elevation angles in SAR images

IEEE Transactions on Geoscience and Remote Sensing, 1994
In mapping nonflat regions of the Earth using airborne synthetic aperture radar, (SAR), terrain height variations cause two problems in radiometric calibration: the first being that the local incidence angle for any pixel may vary from that given by the flat (or curved) Earth assumption, the second, being that the wrong elevation angle may be used in ...
Freeman, A. *), Zink, M.
openaire   +2 more sources

Refractivity estimation using multiple elevation angles

IEEE Journal of Oceanic Engineering, 2003
Estimation of the atmospheric refractivity is important for the prediction of radar performance. Surface or elevated trapping layers formed by the outflow of relatively dry and warm air over a cooler body of water often result in the refractive structure-supporting-convergence-zone-like behavior and multimodal effects.
P. Gerstoft, L.T. Rogers, W.S. Hodgkiss, L.J. Wagner   +3 more
openaire   +1 more source

Relations Between the Bearing and Elevation Angle

1969
The three quantities of most interest in the study of scintillations are the instantaneous bearing, amplitude and elevation angle. So far this discussion on scintillation has been mainly on the relation between bearing angles and amplitudes ignoring the fact that the incoming wave can also vary in elevation angle.
openaire   +1 more source

2 GHz outdoor to indoor propagation at high elevation angles

The 13th IEEE International Symposium on Personal, Indoor and Mobile Radio Communications, 2003
The case of outdoor to indoor propagation prediction at high elevation angles has scarcely been addressed and no direct relationship between elevation angles and building penetration loss has been reported. High altitude platform stations (HAPS) - a new means of providing international mobile telephony (IMT-2000) - will be operating at high elevation ...
Dimitrios I. Axiotis, Michalis E. Theologou   +1 more
openaire   +1 more source

Minimum Audible Movement Angle as a Function of the Azimuth and Elevation of the Source

Human Factors: The Journal of the Human Factors and Ergonomics Society, 1992
In the future auditory directional cues may enhance situational awareness in cockpits with head-coupled displays. This benefit would depend, however, on the pilot's ability to detect the direction of moving sounds at different locations in space. The present investigation examined this ability.
T Z, Strybel, C L, Manligas, D R, Perrott   +2 more
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ISAR imaging of targets at low elevation angles

IEEE Transactions on Aerospace and Electronic Systems, 2001
The problem of inverse synthetic aperture radar (ISAR) image reconstruction of targets at low elevation angle is considered. In this geometric condition the main causes affecting the reconstructed ISAR image are the multipath effect due to the reflection of the Earth's surface and the angular motions of the target produced by external action like wind,
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The Effect of Low-Angle and High-Angle Grain Boundaries on Elevated Temperature Strength

MRS Proceedings, 1994
AbstractThe influence of small (subgrain) misorientation interfaces on the mechanical behavior of metals and alloys deforming within the creep regime has been intensively studied over the past several decades. Controversies have existed, but some new experiments suggest, contrary to the general opinion, that low-angle boundaries are not associated with
openaire   +1 more source

Gradient-based bearing-only formation control: An elevation angle approach

Automatica, 2022
Liangming Chen, Zhiyong Sun
exaly