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Aladin: Mission and Instrument Concept for a European Space-borne CO2-Laser Doppler Wind Lidar

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Abstract

The main features of the proposed instrument are a fixed nadir-oriented telescope with an oversized primary mirror and an array of off-axis secondary mirrors, addressing shot azimuth positions on a 30° nadir-angle cone. Step scanning is performed by a small focal plane stepper, avoiding lag-angle and torque compensation problems encountered in scanning telescope concepts. Hence, the concept is insensitive to misalignment and employs a minimum of internal alignment control at full scanning capability.

© 1995 Optical Society of America

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