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.

Update on the Space Technology Research Vehicle

Abstract: This paper provides an update on the Space Technology Research Vehicle (STRV) project currently underway at the Farnborough site of the UK Defence Research Agency. The collaborative nature of the project is emphasized, and a description provided of the technologies to be demonstrated and the experiments to be conducted during the expected one year mission of the two small (approximately 50 kg) satellites in geostationary transfer orbit. The development status of the project as at March 1993 is indicated.© (1993) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.

Parasitic languages for requirements

Abstract: Computer modelling is a viable method for aiding requirements elicitation of future systems as it provides a mechanism for understanding and consolidating ideas which people can readily relate to. However a major drawback with a computer model is the capturing of its requirements for future contractual use. We put forward a method by which requirement statements can be attributed within models that allows for post compilation extraction and analysis. This approach is based on adding a parasitic language to a modelling language which strongly couples requirements to items of code, but which is transparent to the dynamic execution of the model. The paper illustrates the approach on a simple language and discusses how the approach has been incorporated within a large system modelling language. The ability to provide direct links to requirement management repositories is shown.

Millimetre wave radar imaging

Abstract: The article is concerned with the formation of high resolution radar images with high geometric accuracy and the registration of these images against cartographic maps or other forms of reference. The majority of the radar data has been gathered using a millimetre wave radar sensor designed to allow the application of Doppler beam sharpening (DBS) techniques. DBS processing is very similar in character to synthetic radar aperture (SAR) processing, both exploit the differential Doppler shift imparted to returning radar signals and use it to give increased angular resolution. The difference between SAR and DBS being that DBS processing is used to enhance cross-range resolution at angles around the boresight whereas SAR processing is carried out on data from a sideways looking radar. >

Characterization of Pseudomorphic Si/Si1-xGex Multi-Quantum Well Structures by Spectroscopic Ellipsometry

Abstract: Reference dielectric function spectra, $$\bar \varepsilon - {\varepsilon _1} + i{\varepsilon _2}$$ , for strained Si1−xGex have been generated for 0≤x≤0.255. Used in an interpolation procedure they allow multilayer analysis of pseudo-dielectric function spectra, $$ - + i $$ , measured by spectroscopic ellipsometry (SE) on strained Si1−xGex/Si structures of arbitrary composition, x<0.255. These include multi-quantum well (MQW) structures important for application as infrared detectors.