Results 241 to 250 of about 5,077 (284)

A radar vital signs detection method in complex environments. [PDF]

Sci Rep
Zhang C, Liu H, Zhu Y, Fu G, Chen X, Yang D.   +5 more
europepmc   +1 more source

Navigating in clutter: how bumblebees optimize flight behaviour through experience. [PDF]

J Exp Biol
Jeschke M, Stahlsmeier M, Egelhaaf M, Bertrand OJN.   +3 more
europepmc   +1 more source

Performance prediction of wideband unambiguous target detection in diffuse ground clutter

, 2016
Nikita Petrov, François Le Chevalier, Alexander Yarovoy   +2 more
openalex   +1 more source

Bumblebees increase their learning flight altitude in dense environments.

J Exp Biol
Sonntag A, Lihoreau M, Bertrand OJN, Egelhaaf M.   +3 more
europepmc   +1 more source

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Radar ground clutter prediction

SPIE Proceedings, 2003
To investigate the potentiality of a radar ground prediction radar satellite data (SAR) have been studied for the generation of clutter estimation models. The generation of clutter statistics as well as scrutinized analysis of specific dependencies and influences of backscatter processes and behaviour is the basis for statistical clutter prediction ...
Rainer Wehrenberg, Dieter Rickenbrock
openaire   +1 more source

Radar ground-clutter shields

1965 Antennas and Propagation Society International Symposium, 1966
Metal shields (or fences) are useful in reducing the ground clutter received by a radar. The design of a clutter shield for an L-band monopulse radar employing a 60-ft parabolic reflector with Cassegrainian geometry is verified by scale-model measurements at K a -band.
J. Ruze, F.I. Sheftman, D.A. Cahlander
openaire   +1 more source

Weibull-Distributed Ground Clutter

IEEE Transactions on Aerospace and Electronic Systems, 1981
Weibull-distributed ground clutter of cultivated land was measured using an L-band long-range air-route surveillance radar (ARSR) having a 3.0 ?s pulsewidth and a 1.23° beamwidth at very low grazing angles between 0.21° and 0.32°. It is shown that the shape parameter of the Weibull distribution varied from c = 1.507 to c = 2.0, corresponding to the ...
M. Sekine, S. Ohtani, T. Musha, T. Irabu, E. Kiuchi, T. Hagisawa, Y. Tomita   +6 more
openaire   +1 more source

Cylindrical ground-clutter shield

IEEE Transactions on Antennas and Propagation, 1976
A theoretical investigation of the influence of metal shields on antenna radiation patterns is performed. This study allows us to determine the proper dimensions of a circular cylindrical finite perfectly conducting shield placed on the ground around infinitesimal sources located at its axis, in order to reduce the ground-side lobe.
C. Pereira, null Chen-To Tai
openaire   +1 more source

Ground Clutter In Optical Seekers

Optical Engineering, 1981
A new approach to the study of ground clutter radiation in electro-optical missile seekers has been developed that utilizes a comparison between seeker responses for artificial and measured infrared (IR) scenes. Seeker responses were statistically very much the same for both types of input except at a few isolated points thought to be the commonly ...
R. C. Anderson, P. R. Callary
openaire   +1 more source