Results 241 to 250 of about 123,753 (301)

Fiber-optic radar calibration

IEEE Aerospace and Electronic Systems Magazine, 2005
A simple fiber-optic radar calibration target is described. Its operation is based on a wideband fiber, a laser transmitter that is directly modulated by the down-converted radar signal and an optical diode receiver recovering said signal. Further up-conversion having a common local oscillator with the first mixer ensures fidelity of the calibration ...
M. Puranen, P. Karha, P. Eskelinen
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Radar and optical measurements of Cn2

Applied Optics, 1982
Comparison is made of C(2)(n) profile measurements obtained with a stellar scintillometer and uhf 440-MHz radar. The scintillometer C(2)(n) was obtained at altitude positions between 5 and 18 km, each with a broad height resolution. The radar C(2)(n) was obtained at 400-m intervals with 550-m height resolution.
R E, Good, B J, Watkins, A F, Quesada, J H, Brown, G B, Loriot   +4 more
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European RAdar-Optical Research Assemblage (ERA-ORA)

IEEE 1999 International Geoscience and Remote Sensing Symposium. IGARSS'99 (Cat. No.99CH36293), 2003
Summary form only given. ERA-ORA is a co-operative project funded by the European Commission within the Environment and Climate research and technological development programme in the field of space techniques applied to environmental monitoring and research.
Solimini, D., Le Toan, T., Schmullius, C., Borgeaud, M., Wegmüller, U., Guissard, A., Quegan, S., Moreno, J.F., Hoekman, D.H.   +8 more
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Optical display for radar sensing

SPIE Proceedings, 2015
Boltzmann headstone S = k B Log W turns out to be the Rosette stone for Greek physics translation optical display of the microwave sensing hieroglyphics. The LHS is the molecular entropy S measuring the degree of uniformity scattering off the sensing cross sections.
Harold Szu, Charles Hsu, Jefferson Willey, Joseph Landa, Minder Hsieh, Louis V. Larsen, Alan T. Krzywicki, Binh Q. Tran, Philip Hoekstra, John T. Dillard, Keith A. Krapels, Michael Wardlaw, Kai-Dee Chu   +12 more
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Optical fiber imaging laser radar

SPIE Proceedings, 2003
We have developed the Optical Fiber Imaging Laser Radar based on the focal plane array detection using the small number of detectors less than the number of the focal plane array resolution. For this focal array detection, first, we made the optical fiber dissector which has one vertical cross section of the 35 x 35 optical fibers square array at one ...
Akira Akiyama, Takahiro Watanabe, Minoru Doshida, Kazuhisa Kanda, Yukiteru Kakimoto, Hiroyuki Yasuo, Masahiro Kuwabara, Hideo Kumagai, Hiromitsu Ishii   +8 more
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Optical Simulation of Radar Ambiguities

IEEE Transactions on Aerospace and Electronic Systems, 1970
Coherent optical systems, because of their basic similarity to coherent radar systems, can be used to simulate many of the characteristics of the latter. This paper discusses the use of a coherent optical system for the simulation of the range and azimuth ambiguities that sometimes occur in radar systems.
Emmett Leith, Albert Friesem, Arthur Funkhouser   +2 more
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CO2 OPTICAL RADAR SYSTEM

1967
Abstract : Progress is reported on a program to develop and build a 1 kW average power 10.6 micron amplifier for radar applications. Small signal gain and saturation measurements were made on 1-in. diameter amplifier tubes using a CO2- N2-He mixture with cw driving signals.
M. R. Smith, W. B. Bridges
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A Precise Optical Instrumentation Radar

IEEE Transactions on Aerospace and Electronic Systems, 1966
An instrumentation tracker is described which provides real-time positional data on high-speed cooperative targets with precisions of ±1 m at ranges between 300 m and 10 km. Unambiguous range is determined by a precise digital FM-CW ranging technique at a rate of 15 per second.
T. C. Hutchison, A. A. Hagen, H. Laudon, C. R. Miller   +3 more
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Detection efficiency of coherent optical radar

Applied Optics, 1984
Using the Huygens-Fresnel principle, the detection efficiency of a coherent optical radar is formulated. This formulation includes the effect of misalignment between the signal field and the local oscillator field. In the far-field case, the detection efficiency of a diffuse target is approximately half that of a glint target when the transmitter and ...
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Optically controlled phased array radar

International Topical Meeting on Microwave Photonics. MWP '96 Technical Digest. Satellite Workshop (Cat. No.96TH8153), 2002
The experimental results presented in this paper indicate that optically driven phased array antennas with high performance and true time delay can be practically implemented. The paper concentrates on the potential performance of optically driven antenna systems using a coherent WDM architecture.
S.R. Forrest, R.B. Taylor
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