Defence Research Agency

About: Defence Research Agency is a based out in . It is known for research contribution in the topics: Synthetic aperture radar & Radar. The organization has 1211 authors who have published 1109 publications receiving 31542 citations.

Armed forces' views on Shared Spectrum Access

Abstract: Recent transition from mobile telephony to daily consumption of mobile data presents the challenge of adequate spectrum availability. Besides regulators and operators, this challenge faces both public safety authorities and military as well. This paper investigates how selected spectrum sharing concepts (namely, European Licensed Shared Access (LSA) and US Citizens Broadband Service (CBRS)) support the military interests either as a Primary User (PU) or as a Secondary User (SU) and whether these concepts facilitate temporal adjustments of national defence from peace time mode of operations to hybrid warfare or to large scale homeland defence. In this paper we have shown that military spectrum needs vary from one scenario to another and that Shared Spectrum Access may support expected needs of spectrum in times of most dire stress. Both of the concepts reviewed have built in dynamism, which however does not support PU-SU role changes across tiers.

Structural studies of ion beam synthesised {SiGe}/{Si} heterostructures for HBT applications

Abstract: Si/Si 1− x Ge x /Si heterostructures which are potentially suitable for HBT fabrication have been synthesised by implanting Ge + ions into a Si(100) substrate upon which a Si overlayer was deposited, followed by Si + -induced post-amorphization and low temperature Solid Phase Epitaxial Growth RBS and TEM investigations have shown that the Ge induced end-of-range (EOR) defects are annihilated during regrowth, as well as extended defects observed in some C + co-implanted samples, resulting in good crystalline structures

Application of porous silicon technology to optical waveguiding

Abstract: Porous silicon is a widely studied material which has significant potential for the realisation of monolithic, all-silicon optoelectronic integrated circuits. To maintain monolithicity, irrespective of the light source technology used, silicon-based optical waveguides will be required, these enabling light from the source to be routed and split to different points, on-chip or otherwise. Although a number of silicon-based waveguide technologies are available, the aim of the present study is to highlight the use of, and flexibility afforded by, porous silicon as a waveguide medium.

FOAM-an operational forecasting ocean-atmosphere model for naval applications

Abstract: The paper describes the philosophy behind the development of FOAM, a forecasting ocean atmosphere model that is being developed for operational use by the Royal Navy. >