Results 251 to 260 of about 123,753 (301)

Multichannel optical correlator for radar signal processing

Applied Optics, 1978
A multichannel coherent optical processor for radar signals is described in which pulse compression is achieved by matched spatial filtering. The optical system can be used for phased array, linear frequency modulated pulse burst, or other radar systems. However, only its application to linear phased array signal processing is discussed in depth.
D, Casasent, E, Klimas
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Circulators for Optical Radar Systems

Applied Optics, 1965
An optical isolator is discussed which is suitable for use in high-gain optical isolators. After a brief discussion of the necessary properties of such an isolator, a particular design is discussed. Measurements on a breadboard model using a He–Ne laser operating at 6328 A indicate an isolation greater than 40 dB and insertion loss of 27% (1.1 dB). The
Paul C. Fletcher, David L. Weisman
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Integrated-optical synthetic aperture radar processor

Annual Meeting Optical Society of America, 1985
Synthetic aperture radar (SAR) is a 2-D signal processing problem that normally requires a 3-D optical implementation. We describe an optical method for performing SAR imaging that can be implemented using integrated optics, which is typically configured as a planar structure.
T. J. Bicknell, D. Psaltis, A. R. Tanguay   +2 more
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Improved Optical Resonator For Laser Radars

SPIE Proceedings, 1986
It is theoretically and experimentally demonstrated that Gaussian reflectivity mirrors (GRMs) can improve the performances of lasers for radar applications. The effects of misalignment and hard apertures are investigated. The optimum design parameters are given.
Pierre Lavigne, Nathalie McCarthy, Andre Parent, Danny Pascale   +3 more
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Optical Design for Laser Radar Instrumentation

Classical Optics 2014, 2014
An optical laser radar instrument for atmospheric aerosol remote sensing has been developed. Wide angle optics coupled with CCD detection allow derivation of particulate scattering from laser pulses. Design challenges and experimental results are discussed.
Nimmi C. Sharma, John E. Barnes
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Asynchronous optical sampling, terahertz impulse radar

2009 Conference on Lasers & Electro Optics & The Pacific Rim Conference on Lasers and Electro-Optics, 2009
Rapid THz impulse radar was achieved by combination of time-of-flight measurement of THz pulse and asynchronous optical sampling technique. The precision of 354 µm was achieved in the displacement measurement.
Y. Ohgi, Y. Kabetani, T. Yasui, S. Yokoyama, T. Araki   +4 more
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An Optical Radar for Surveying

Transactions of the American Institute of Electrical Engineers, 1948
An instrument is described which uses radar techniques to make a survey of terrain. Distances are determined by measuring the transit time of pulses of light traveling between the instrument and a retrodirective reflector placed at the point whose relative position is to be found. Angles are measured by adjusting the position of the optical transmitter
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Optical Radar Angle Tracking Mount

1973
Abstract : The report consists of an environmental analysis in two parts: random solar heat pointing error; and the hydrostatic bearings design in three parts: azimuth axis thrust bearing, azimuth axis radial bearing, and evaluation axis radial bearing. These subjects are critical design criteria for the optical radar angle tracking mount.
Spiro Pappas, George J. Thompson
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Pulse Compression in Optical Radar

IEEE Transactions on Aerospace and Electronic Systems, 1979
An analysis of the application of pulse-compression techniques in optical radar systems is presented. The particular case of pseudorandom on-off amplitude coding is chosen for ease of analysis. The roles of the siqnal and photodetector properties and the processing method are examined.
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Optical fiber imaging laser radar

Optical Engineering, 2005
We develop an optical fiber imaging laser radar based on the focal plane array detection method using a small number of detectors less than the number of the focal plane array resolution. For the development of this kind of the focal array detection method, we produce the optical fiber dissector, the movable aperture, and the small-number parallel ...
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