Results 261 to 270 of about 14,550 (304)

Analysis of observed aircraft-to-aircraft separations

2008 Integrated Communications, Navigation and Surveillance Conference, 2008
As air traffic demand continues to increase in the coming years, the need for concepts, procedures and tools that can improve airspace efficiency will likewise increase. Reduction of terminal and en-route separation minima has been the focus of many of the concepts and emerging technologies developed to respond to this need.
Stephen Szurgyi, Sanjiv Shresta, Dejan Neskovic, James DeArmon, Scott Williams   +4 more
openaire   +1 more source

Melting layer observations with radar and aircraft

Proceedings of IGARSS '94 - 1994 IEEE International Geoscience and Remote Sensing Symposium, 2002
Multiparameter radar measurements with the DLR polarimetric radar are combined with a vertical looking Doppler radar to study the melting of snow. The interpretation of the microphysical processes during melting by radar measurements is supported by in situ observations of the melting particles. >
Hagen, M. (Vortragender), Hubbert, J. (1), Richter, C. (2), Bringi, V.N. (1), Meischner, P.   +4 more
openaire   +2 more sources

Aircraft observations of sea-breeze frontal structure

Quarterly Journal of the Royal Meteorological Society, 1999
AbstractDetailed aircraft observations of sea‐breeze frontal structure and dynamics are presented for two cases of well defined sea‐breeze fronts near the east coast of England. In the first case the sea‐breeze was advancing into a well mixed convective boundary layer with strong turbulence and an offshore breeze of around 3 m s‐1.
R. Wood, I. M. Stromberg, P. R. Jonas
openaire   +1 more source

Multiparameter radar and in situ aircraft observation of graupel and hail

IEEE Transactions on Geoscience and Remote Sensing, 2000
Documenting simultaneous multiparameter radar observations of precipitation in conjunction with in situ hydrometeor sampling is important for the interpretation of multiparameter radar observations. In situ observation using aircraft-mounted probes is one of the best ways to collect such data.
V N Bringi
exaly   +2 more sources

Some Observations on the Mechanism of Aircraft Wing Rock

Journal of Aircraft, 1978
A pressure scale model of Northrop F-5A was tested in NASA Ames Research Center Eleven-Foot Transonic Tunnel to simulate the wing rock oscillations in a transonic maneuver. For this purpose, a flexible model support device was designed and fabricated which allowed the model to oscillate in roll at the scaled wing rock frequency. Two tunnel entries were
C. HWANG, W. PI
openaire   +1 more source

OBSERVER-BASED CONTROL OF A PVTOL AIRCRAFT

IFAC Proceedings Volumes, 2005
Abstract In this paper, we propose an observed-based control for the PVTOL aircraft considering that the angular position is not measurable. The control strategy presented here, is robust with respect to observer errors and takes into account constraints imposed by the nonlinear observer.
Anand Sánchez, Isabelle Fantoni, Rogelio Lozano, Jesús De León Morales   +3 more
openaire   +1 more source

Aircraft observation of the scintillation of a ground source

Radiophysics and Quantum Electronics, 1969
exaly   +2 more sources

Aircraft observations near jet streams

Quarterly Journal of the Royal Meteorological Society, 1963
AbstractThe results of an analysis of 22 flights through jet streams by aircraft of the Meteorological Research Flight are presented. The average distributions of wind speed, vertical and horizontal wind shear, potential temperature, water vapour, cirrus cloud and ozone are obtained in relation to the jet core, and are discussed in relation to existing
J. Briggs, W. T. Roach
openaire   +1 more source

Aircraft observations of convective cloud electrification

Journal of Atmospheric and Terrestrial Physics, 1959
Abstract A horizontal component of the potential gradient in and around developing trade-wind and extra-tropical cumulus clouds has been measured with field meters mounted in the wingtips of an airplane. Characteristic similarities and differences in the electrostatic behaviour of all-water and of mixed-phase clouds studied in 1953–1955 are discussed.
D.R. Fitzgerald, H.R. Byers
openaire   +1 more source

Observations and predictions of secondary neutrons on space shuttle and aircraft

Advances in Space Research, 1998
The Cosmic Radiation Effects and Activation Monitor has flown on six Shuttle flights between September 1991 and February 1995 covering the full range of inclinations as well as altitudes between 220 and 570 km, while a version has flown at supersonic altitudes on Concorde between 1988 and 1992 and at subsonic altitudes on a SAS Boeing 767 between May ...
P R, Truscott, C S, Dyer, H E, Evans, A J, Sims, C L, Peerless, P R, Knight, M, Cosby, J C, Flatman, C, Comber, N D, Hammond   +9 more
openaire   +2 more sources