In this paper, we describe Optical Aperture Synthesis (OAS) imaging instrument concepts studied by Alcatel Alenia Space under a CNES R&T contract in term of technical feasibility. First, the methodology to select the aperture configuration is proposed, based on the definition and quantification of image quality criteria adapted to an OAS instrument for direct imaging of extended objects. The following section presents, for each interferometer type (Michelson and Fizeau), the corresponding optical configurations compatible with a large field of view from GEO orbit. These optical concepts take into account the constraints imposed by the foreseen resolution and the implementation of the co-phasing functions. The fourth section is dedicated to the analysis of the co-phasing methodologies, from the configuration deployment to the fine stabilization during observation. Finally, we present a trade-off analysis allowing to select the concept wrt mission specification and constraints related to instrument accommodation under launcher shroud and in-orbit deployment.
The increasing productivity gap affecting the progress of electronic system design is a sufficient motivation to investigate further solutions to avoid this problem. As an immediately available solution, the application of reuse techniques is widely recognized. By reusing designs, productivity is increased because designers do not have to reinvent large portions of the design. Design reuse is becoming a big market and involves people, concepts, methods and tools. This paper is aimed at providing mechanisms for promoting effective reuse of hardware system specifications. The importance and benefits of reusability of high level hardware models, and our proposed strategy for reusing graphical specifications ai e presented.
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