Results 41 to 50 of about 93,870 (317)

Passive forward scatter radar based on satellite TV broadcast for air target detection: preliminary experimental results [PDF]

, 2017
The focus of this paper is on the detection of airborne targets and on the estimation of their velocity by means of passive forward scatter radar systems based on the DVB-S as transmitter of opportunity.
Arcangeli, Andrea, BONGIOANNI, CARLO, LOMBARDO, Pierfrancesco, PASTINA, Debora, USTALLI, NERTJANA   +4 more
core   +1 more source

A target threat assessment method for low-altitude aircraft

Journal of Physics: Conference Series, 2020
Abstract In recent years, with the gradual opening up of chinese low-altitude airspace, and the government active support for the development of the general aviation and drone industries, the traditional physical protection is mainly aimed at ground threats, resulting in the threat and harassment from air targets has become increasingly ...
Xiaoqian Nie, Peng Yan, Bingqi Wang, Binbin Wu, Chengshuai Gao   +4 more
openaire   +1 more source

Thermal Infrared Imaging Experiments of C-Type Asteroid 162173 Ryugu on Hayabusa2 [PDF]

, 2016
The thermal infrared imager TIR onboard Hayabusa2 has been developed to investigate thermo-physical properties of C-type, near-Earth asteroid 162173 Ryugu.
A. Fujiwara, Axel Hagermann, D.A. Paige, F. Vilas, G.J. Consolmagno, H. Hiesinger, H. Hihara, H. Yano, H.H. Kieffer, H.H. Kieffer, Hirohide Demura, Hiroki Senshu, J. Biele, J. Helbert, J. Veverka, Jun Takita, Jörn Helbert, Ken Endo, Kohei Kitazato, M. Delbo, M. Grott, M. Ishiguro, M.P. Golombek, Makoto Taguchi, Naoya Sakatani, O. Groussin, P. Michel, P.R. Christensen, P.R. Christensen, Ryosuke Nakamura, S. Tachibana, S.C. Chase, Satoshi Tanaka, Sunao Hasegawa, T. Fukuhara, T. Okada, T. Okada, T. Spohn, T.-M. Ho, T.G. Müller, Takehiko Arai, Takehiko Wada, Takeshi Imamura, Tatsuaki Okada, Tetsuya Fukuhara, Thomas G. Müller, Tomohiko Sekiguchi, Toru Kouyama, Tsuneo Matsunaga, W.F. Bottke Jr., Y. Tsuda, Yamato Horikawa, Yoshiko Ogawa   +52 more
core   +2 more sources

Gemini multi-conjugate adaptive optics system review II: Commissioning, operation and overall performance [PDF]

, 2014
The Gemini Multi-conjugate Adaptive Optics System - GeMS, a facility instrument mounted on the Gemini South telescope, delivers a uniform, near diffraction limited images at near infrared wavelengths (0.95 microns- 2.5 microns) over a field of view of ...
Arriagada, Gustavo, Bec, Matthieu, Boccas, Maxime, Carrasco, Eleazar Rodrigo, Colazo, Felipe, d'Orgeville, Céline, Diggs, Sarah J., Ebbers, Angelic W., Edwards, Michelle L., Fesquet, Vincent, Galvez, Ramon L., Garrel, Vincent, Gausachs, Gaston, Lopez, Ariel, Lührs, Javier, Marchant, Claudio, Marin, Eduardo, McGregor, Peter, Montes, Vanessa, Moreno, Cristian, Neichel, Benoit, Pessev, Peter, Rambold, William N., Rigaut, François, Serio, Andrew, Trancho, Gelys, Trujillo, Chadwick, Urrutia, Cristian, van Dam, Marcos A., Vidal, Fabrice, Vucina, Tomislav B., Winge, Claudia, Young, Peter J.   +32 more
core   +7 more sources

Multi-target tracking of birds in complex low-altitude airspace based on GM_PHD filter

The Journal of Engineering, 2019
GM_PHD (Gaussian mixture of probability hypothesis density) cannot completely track multiple targets, such as the flying birds in the complex low-altitude airspace near the airport, due to the lack of the steps of birth detection, track extraction and ...
Tao Hong, Wu Zhang, Weishi Chen, Xiaolong Chen, Xinru Fu   +4 more
doaj   +1 more source

Making color infrared film a more effective high altitude sensor [PDF]

, 1968
Infrared color film for remote sensors at high ...
Bowden, L. W., Pease, R. W.
core   +2 more sources

The software for the robotization of the TROBAR telescope [PDF]

, 2009
The Telescopi ROBotic de ARas (TROBAR) is a new robotic facility built at Aras de Los Olmos (Valencia-Spain). This is a 60cm telescope equipped with a 4kx4k optical camera, corresponding to 30x30 arcmin2 FoV, and it will be primarily used for a ...
Stefanon, Mauro
core   +3 more sources

The Ballistic Design of Intercepting the Ultra-low Altitude Target

IOP Conference Series: Materials Science and Engineering, 2018
According to the multipath effect problem that the missile intercepts the ultra-low altitude target, when the grazing angle near the Brewster Angle, the reflection coefficient of clutter reach the minimum, and the precision of guidance is higher. To ensure that the missile can intercept the target effectively under the vertical launch condition, a ...
Xinpeng Ma, Ruikang Xing, Xinghao Ran, Hairui Zhang   +3 more
openaire   +1 more source

ROPS: A New Search for Habitable Earths in the Southern Sky [PDF]

, 2012
We present the first results from our Red Optical Planet Survey (ROPS) to search for low mass planets orbiting late type dwarfs (M5.5V - M9V) in their habitable zones (HZ).
A. Jordán, Arriagada, Bailey, Baranne, Barnes, Barnes, Barnes, Barnes, Barnes, Barnes, Barnes, Bean, Bernstein, Boisse, Borucki, Brott, Clough, Clough, Collier Cameron, Collier Cameron, Cumming, Currie, D. Minniti, D. Pinfield, Desort, Donati, Endl, Figueira, Gray, Griffin, H. R. A. Jones, Heavens, Heller, Horne, Howard, Ida, J. R. Barnes, J. S. Jenkins, Jenkins, Johnson, Kaltenegger, Kasting, Kennedy, Kotiranta, Kürster, Lagrange, Laughlin, Leigh, Lovis, M. Tuomi, Mahadevan, Marcy, Martínez Fiorenzano, Minniti, P. Arriagada, P. Rojo, Press, Redman, Reid, Reiners, Reiners, Rodler, Rothman, S. V. Jeffers, Saar, Shortridge, Snellen, Steinmetz, Tarter, Tonry, Tuomi, Wittenmyer, Ycas, Zechmeister   +73 more
core   +2 more sources

Elevation Angle Estimation in a Multipath Environment Using MIMO-OFDM Signals

Remote Sensing
It is challenging to estimate the elevation angle of low-altitude targets due to the multipath effect. Various signal processing techniques have been proposed to mitigate these effects, including the use of multi-frequency signals as opposed to single ...
Yeo-Sun Yoon
doaj   +1 more source