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Institution

Naval Surface Warfare Center

FacilityWashington D.C., District of Columbia, United States
About: Naval Surface Warfare Center is a facility organization based out in Washington D.C., District of Columbia, United States. It is known for research contribution in the topics: Sonar & Radar. The organization has 2855 authors who have published 3697 publications receiving 83518 citations. The organization is also known as: NSWC.


Papers
More filters
01 Jan 1990
TL;DR: In this paper, the Doppler spectrum for perfectly reflecting mirrors undergoing various types of accelerations is reviewed and an approximation method is derived that is of use to radar engineers from the exact result.
Abstract: The formalism for computing the Doppler spectrum for perfectly reflecting mirrors undergoing various types of accelerations is reviewed. This method is an amplification of work done by D. Censor and J. Cooper for one-dimensional waves. For sinusoidal waves, the formalism provides a computationally easy algorithm that enables determination of the Doppler spectrum. This method is exact and does not ignore the effects of motion on the amplitude, as is normally done. The mirror is an alternative means of determining the Doppler spectrum of point particles. From the exact result, an approximation method is derived that is of use to radar engineers. Extending these results to other commonly used radar waveforms is considered. >

18 citations

Journal ArticleDOI
TL;DR: In this paper, the ion density of a plasma channel induced by a relativistic electron beam was investigated experimentally under various gas pressures, and a theoretical model was developed to explain the experimental observation.

18 citations

Journal ArticleDOI
TL;DR: In this article, the effect of SiC, AlN, and AlN/SiC on the properties of YB4 ceramics was characterized, and the flexural strength and microhardness of the yttrium tetraboride were about 300 MPa and 27 GPa, respectively.
Abstract: Yttrium tetraboride was synthesized by reactions of Y2O3 with B4C or with a B4C/C mixture. Fully dense YB4 ceramics were prepared by hot-pressing at 1800°C and 20 MPa in He. The flexural strength and microhardness of the YB4 were about 300 MPa and 27 GPa, respectively. Pure YB4 showed considerable oxidation above 1200°C. The effect of SiC, AlN, and AlN/SiC on the properties of YB4 ceramics was characterized. No chemical interactions were identified in the YB4–SiC and YB4–AlN pseudo binaries. The addition of SiC improved the oxidation resistance below 1200°C. At higher temperatures, the low viscosity of a surface melt caused its continuous runoff and the loss of the oxidation-protection capability of the scale. The addition of AlN/SiC improved the oxidation resistance compared to the ceramics containing only SiC, which was attributed to the presence of Al2O3 in the Y2O3–SiO2–B2O3 glass leading to an increase in its viscosity and preventing glass runoff. A significant improvement in the oxidation resistance of the YB4 ceramics and extension of their oxidation stability to 1400°C was accomplished by the introduction of AlN only.

18 citations

Proceedings ArticleDOI
10 Mar 1991
TL;DR: In this paper, the alpha-beta filter is used to quantify the filter's performance against different measurement models representing a target's trajectory, and closed form expressions for smoothed position and velocity outputs for various measurement models are derived.
Abstract: The response characteristics of the alpha-beta filter are used to quantify the filter's performance against different measurement models representing a target's trajectory. The transfer functions for an alpha-beta filter are used to derive closed form (solutions) expressions for smoothed position and velocity outputs for various measurement models. The filter's response to constant velocity targets is found to be the input plus a sinusoidal transient. Constant acceleration measurement models, in addition, yield a steady state bias that is a function of the filter parameters alpha and beta . Finally, the filter's response to a sinusoidal input is determined. >

18 citations


Authors

Showing all 2860 results

NameH-indexPapersCitations
James A. Yorke10144544101
Edward Ott10166944649
Sokrates T. Pantelides9480637427
J. M. D. Coey8174836364
Celso Grebogi7648822450
David N. Seidman7459523715
Mingzhou Ding6925617098
C. L. Cocke513128185
Hairong Qi503279909
Kevin J. Hemker4923110236
William L. Ditto431937991
Carey E. Priebe434048499
Clifford George412355110
Judith L. Flippen-Anderson402056110
Mortimer J. Kamlet3910812071
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Performance
Metrics
No. of papers from the Institution in previous years
YearPapers
20233
20227
202172
202071
201982
201884