Results 261 to 270 of about 123,753 (301)

Optical controlled phased array radar receivers

Proceedings of IEEE Antennas and Propagation Society International Symposium, 2002
The National Center for Integrated Photonics Technology has a demonstration experiment to examine the role of photonics in phased array radar applications. Two test configurations are being assembled in a receiver-only mode at UCLA. These systems involve both a coherent approach using optical heterodyne detection and an incoherent implementation using ...
H.R. Fetterman, S.R. Forrest, D.V. Plant
openaire   +1 more source

Stratospheric aerosol measurements by optical radar

Journal of Atmospheric and Terrestrial Physics, 1970
Abstract A laser radar is being used at Adelaide, South Australia (35°S) for routine studies of upper atmosphere densities and aerosol concentrations to an altitude of 60 km. The transmitter operates at a wavelength of 0.694 μ and generates pulses of 0.2 J energy and 0.5 μsec pulse length at a rate of 20 per min. The receiver is a 12 in.
K Bartusek, D.J Gambling, W.G Elford
openaire   +1 more source

Mars: Correlation of Optical and Radar Observations

Science, 1969
A comparison of recent photographic and radar data on Mars indicates a good positive correlation between dark areas and radar reflection peaks and also between cloudy "desert" areas and radar minima. The data may be taken as evidence that dark areas are, in general, relatively smooth whereas deserts are relatively rough.
openaire   +2 more sources

Optical radar results and meteoric fragmentation

Journal of Geophysical Research, 1964
Recent optical radar experiments utilizing a ruby laser as the source of radiation have indicated the existence of a scattering layer in the upper atmosphere at an altitude between 110 and 140 km. The echoes have been tentatively interpreted in accordance with a model of meteoric fragmentation and have been related to other experimental results.
G. Fiocco, G. Colombo
openaire   +1 more source

Simulation of error in optical radar range measurements

Applied Optics, 1997
We describe a computer simulation of atmospheric and target effects on the accuracy of range measurements using pulsed laser radars with p-i-n or avalanche photodiodes for direct detection. The computer simulation produces simulated images as a function of a wide variety of atmospheric, target, and sensor parameters for laser radars with range ...
S, Der, B, Redman, R, Chellappa
openaire   +2 more sources

A simplified optical correlator for radar-signal Processing

Proceedings of the IEEE, 1969
Radar-signal processing is an interesting application of optical correlators. A simplified optical correlator is described and experimental results are presented.
ATZENI, CARLO, L. PANTANI
openaire   +2 more sources

Optical radar performance in atmospheric scattering

Journal of Atmospheric and Terrestrial Physics, 1967
Abstract Consideration is given to the factors that affect the performance of an optical radar used to study scattering in the atmosphere for the case where photon counting is used in the receiver. A basis for describing and comparing the performance of radars is suggested. The performance factors of a number of laser radars is given.
openaire   +1 more source

Flyable fiber-optic radar target generator

AUTOTESTCON 93, 1994
Airborne radar relies on Built-in-Test (BIT) for fault detection, fault isolation and system calibration. The capability of BIT is often limited by space, weight, size and cost considerations. Furthermore, the radar does not have a test target that will allow BIT to perform in flight, closed-loop functional test of the complete radar system. This paper
openaire   +1 more source

An optical radar pilot warning indicator

Proceedings of the IEEE, 1970
A proposed pilot warning instrument based upon the principle of an optical radar is described. Target cross section enhancement, through the use of a passive retroreflector, allows a small semiconductor light-emitting laser diode to act as transmitter. A split scanning beam together with integrated circuit signal processing gives the "tau" time of each
openaire   +1 more source

Broadband multispectral compatible absorbers for radar, infrared and visible stealth application

Progress in Materials Science, 2023
Ting Yu, Shujuan, Ming Zhou
exaly