DocumentCode :
1812051
Title :
RCS enhancement due to Bragg scattering
Author :
Padhy, Venkat Prasad ; Negi, Yoginder Kumar ; Balakrishnan, N.
Author_Institution :
Supercomput. Educ. & Res. Centre, Indian Inst. of Sci., Bangalore, India
fYear :
2012
fDate :
28-30 Aug. 2012
Firstpage :
443
Lastpage :
446
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.
Keywords :
Bragg gratings; acoustic radiators; aircraft; boundary integral equations; electromagnetic wave scattering; radar cross-sections; radar detection; Bragg scattering; EM fluctuation; RASS; RCS enhancement; acoustic disturbances; dielectric constant fluctuation; electromagnetic wave scattering; low visible target dtection; volume surface integral equation; Acoustics; Aircraft; Electromagnetic scattering; Nonhomogeneous media; Radar cross section;
fLanguage :
English
Publisher :
ieee
Conference_Titel :
Mathematical Methods in Electromagnetic Theory (MMET), 2012 International Conference on
Conference_Location :
Kyiv
ISSN :
2161-1734
Print_ISBN :
978-1-4673-4478-4
Type :
conf
DOI :
10.1109/MMET.2012.6331266
Filename :
6331266
Link To Document :
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