Naval Surface Warfare Center

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.

Wireless Channel Modeling of Multiply Connected Reverberant Spaces: Application to Electromagnetic Compatibility Assessment

Abstract: Radio-frequency wireless communications and sensor networks are currently being deployed in structures that comprise confined, reflective spaces that are electromagnetically coupled. Such structures are commonly found in aviation, shipping, automotive, and warehousing industries. In this paper, a general time-dependent model is presented whose solutions directly provide key properties of the wireless communications channel in multiply connected reverberant spaces. The model equations can be solved numerically for any number of cavities and for any level (weak or strong) of coupling between the cavities. The wireless channel properties investigated in this paper include power delay profile, rms time delay spread, coherence bandwidth, average received channel power, signal-strength fading statistics, and maximum field environment. Measured and modeled channel properties are presented for two and three coupled, highly multipath spaces. These channel model parameters aid in making electromagnetic compatibility assessments of wireless network emissions in these environments.

Analytical/Experimental Evaluation of Hybrid Commingled Carbon/Glass/Epoxy Thick-Section Composites under Compression

Abstract: This paper outlines a current effort at improving the compressive strength of carbon fiber reinforced composites (CFRC) by using a hybrid carbon/glass commingling concept. Prior investigations into...

Effect of nonuniform target motion on radar backscattered waveforms

Abstract: The effect of nonuniform motion on radar waveforms is discussed. By considering the physical model of a perfectly reflecting mirror with an arbitrary law of motion r(t), it is possible to determine the functional form of the scattered wave at the receiver for any waveform in general. The particular example of an interrupted continuous wave waveform is used to analyse the effect of nonuniform motion on the return spectrum. These models provide a theoretical foundation for the observations of micro-Doppler that have been discussed by a number of authors. Finally, some of the implications, both physical and mathematical, of nonuniform motion for time–frequency methods are addressed.

Low/high temperature relationships in dinitramide salts by DEA/DSC and study of oxidation of aluminum powders by DSC/TG

Abstract: The dinitramide salts of ammonia (ADN), hexamethylenetetramine (HDN), potassium (KDN), and sodium (NaDN) showed a linear relationship between the DSC rate of decomposition at the peak maximum and the DEA tanδ value at the low temperature transition peak. As the cation basicity increased in the series ADN