Computer Science
Scientific paper
Dec 1995
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1995spie.2581..170j&link_type=abstract
Proc. SPIE Vol. 2581, p. 170-177, Lidar Techniques for Remote Sensing II, Christian Werner; Ed.
Computer Science
Scientific paper
A spaceborne Doppler wind lidar (DWL) is a unique instrument for probing atmospheric wind fields on a global scale with high lateral and vertical coverage and resolution. A promising and mature technology is a pulsed CO2-laser based instrument employing heterodyne reception of the Doppler shifted laser light scattered back from atmospheric aerosols. The main features of the proposed instrument concept of ALADIN 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 degree 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. It is applicable for an autonomous mission as well as for a mission on the space station.
Johann Ulrich A.
Safa Frederic
Schwarzenberger Paul M.
Treichel Rainer
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