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Optical System Design and Integration of the Global Ecosystem Dynamics Investigation LidarThe 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.
Document ID
20190030790
Acquisition Source
Goddard Space Flight Center
Document Type
Conference Paper
External Source(s)
doi:10.1117/12.2530653
Authors
Wake, Shane (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Ramos-Izquierdo, Luis (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Eegholm, Bente (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Dogoda, Peter (Sigma Space Corp. Lanham, MD, United States)
Denny, Zachary (Science Systems and Applications, Inc. (SSAI) Lanham, MD, United States)
Hersh, Michael (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Mulloney, Michael (Stinger Ghaffarian Technologies Inc. (SGT Inc.) Greenbelt, MD, United States)
Thomes, W. Joe (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Ott, Melanie N. ORCID(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Jakeman, Hali (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Poulios, Demetrios (American Univ. Washington, DC, United States)
Mule, Peter (NASA Goddard Space Flight Center Greenbelt, MD, United States)
de Leon, Erich (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Blair, J. Bryan (NASA Goddard Space Flight Center Greenbelt, MD, United States)
Date Acquired
September 13, 2019
Publication Date
September 9, 2019
Publication Information
Publication: Proceedings of SPIE
Publisher: Society of Photo-optical Instrumentation Engineers
Volume: 11128
ISSN: 0277-786X
e-ISSN: 1996-756X
Subject Category
Spacecraft Instrumentation And Astrionics
Report/Patent Number
GSFC-E-DAA-TN70442
Meeting Information
Meeting: SPIE Remote Sensing
Location: Strasbourg
Country: France
Start Date: September 9, 2019
End Date: September 12, 2019
Sponsors: International Society for Optical Engineering
Funding Number(s)
CONTRACT_GRANT: NNG15HQ01C
CONTRACT_GRANT: NNG15CR64C
Distribution Limits
Public
Copyright
Public Use Permitted.
Technical Review
Single Expert
Keywords
Integration
Engineering
Geosciences
Design
Optics
Physics
Instruments

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