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RCS ENHANCEMENT DUE TO BRAGG SCATTERING

Padhy, Venkat Prasad and Negi, Yoginder Kumar and Balakrishnan, N (2012) RCS ENHANCEMENT DUE TO BRAGG SCATTERING. In: 14th International Conference on Mathematical Methods in Electromagnetic Theory (MMET) , AUG 28-30, 2012 , Kharkiv Natl Acad Municipal Econ, Kharkiv, UKRAINE, pp. 443-446.

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Official URL: http://dx.doi.org/10.1109/MMET.2012.6331266

Abstract

With the advances of techniques for RCS reduction, it has become practical to develop aircraft which are invisible to modern day radars. In order to detect such low visible targets it is necessary to explore other phenomenon that contributes to the scattering of incident electromagnetic wave. It is well known from the developments from the clear air scattering using RASS induced acoustic wave could be used to create dielectric constant fluctuation. The scattering from these fluctuations rather than from the aircraft have been observed to enhance the RCS of clear air, under the condition when the incident EM wave is half of the acoustic wave, the condition of Bragg scattering would be met and RCS would be enhanced. For detecting low visibility targets which are at significant distance away from the main radar, inducement of EM fluctuation from acoustic source collocated with the acoustic source is infeasible. However the flow past aircraft produces acoustic disturbances around the aircraft can be exploited to detect low visibility targets. In this paper numerical simulation for RCS enhancement due to acoustic disturbances is presented. In effect, this requires the solution of scattering from 3D inhomogeneous complex shaped bodies. In this volume surface integral equation (VSIE) is used to compute the RCS from fluctuation introduced through the acoustic disturbances. Though the technique developed can be used to study the scattering from radars of any shape and acoustic disturbances of any shape. For illustrative condition, enhancement due to the Bragg scattering are shown to improve the RCS by nearly 30dB, for air synthetic sinusoidal acoustic variation profile for a spherical scattering volume

Item Type: Conference Paper
Additional Information: Copy right for this article belongs to IEEE COMPUTER SOC,USA
Department/Centre: Division of Interdisciplinary Research > Supercomputer Education & Research Centre
Depositing User: Francis Jayakanth
Date Deposited: 07 Feb 2013 09:20
Last Modified: 07 Feb 2013 09:20
URI: http://eprints.iisc.ac.in/id/eprint/45759

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