Optical System Design and Integration of the Global Ecosystem Dynamics Investigation Lidar

Wake, Shane ; Ramos-Izquierdo, Luis ; Eegholm, Bente ; Dogoda, Peter ; Denny, Zachary ; Hersh, Michael ; Mulloney, Michael ; Thomes, W Joe ; Ott, Melanie N ; Jakeman, Hali(NASA Goddard Space Flight Center, Greenbelt, MD, United States)

关键词: ALIGNMENT;    BORESIGHTS;    GLOBAL ECOSYSTEM DYNAMICS INVESTIGATION (GEDI);    GROUND TRACKS;    INTERNATIONAL SPACE STATION (ISS);    LASER BEAMS;    OPTICAL RADAR;    REMOTE SENSING;    SYSTEMS ENGINEERING;    SYSTEMS INTEGRATION;    TRANSMITTER RECEIVERS;    WAVEFORMS;   

RP-ID  :  GSFC-E-DAA-TN70442

学科分类：航空航天科学

美国|英语

来源: NASA Technical Reports Server

【 摘 要 】

The Global Ecosystem Dynamics Investigation (GEDI) instrument was designed, built, and tested in-house at NASA’s Goddard Space Flight Center and launched to the International Space Station (ISS) on December 5, 2018. GEDI is a multi-beam waveform LiDAR (light detection and ranging) designed to measure the Earth’s global tree height and canopy density using 8 laser beam ground tracks separated by roughly 600 meters. Given the ground coverage required and the 2 year mission duration, a unique optical design solution was developed. GEDI generates 8 ground sampling tracks from 3 transmitter systems viewed by a single receiver telescope, all while maximizing system optical efficiency and transmitter to receiver boresight alignment margin. The GEDI optical design, key optical components, and system level integration and testing are presented here. GEDI began 2 years of science operations in March 2019 and so far, it is meeting all of its key optical performance requirements and is returning outstanding science.