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  • 1
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    The Mercury Laser Altimeter Instrument for the MESSENGER Mission (2006)
    In:  CASI
    Details
    Publication Date: 2018-06-06
    Description: The Mercury Laser Altimeter (MLA) is one of the payload science instruments on the MErcury Surface, Space ENvironment, GEochemistry, and Ranging (MESSENGER) mission, which launched on 3 August 2004. The altimeter will measure the round trip time-of-flight of transmitted laser pulses reflected from the surface of the planet that, in combination with the spacecraft orbit position and pointing data, gives a high-precision measurement of surface topography referenced to Mercury's center of mass. The altimeter measurements will be used to determine the planet's forced librations by tracking the motion of large-scale topographic features as a function of time. MLA's laser pulse energy monitor and the echo pulse energy estimate will provide an active measurement of the surface reflectivity at 1064 nm. This paper describes the instrument design, prelaunch testing, calibration, and results of post-launch testing.
    Keywords: Spacecraft Instrumentation and Astrionics
    Format: application/pdf
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    NASA TECHNICAL REPORTS
  • 2
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    Development of the Multi-Angle Stratospheric Aerosol Radiometer (MASTAR) (2018)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: The contribution of atmospheric aerosols to the Earth's energy budget is an important and relatively uncertain component of the Earth system, with correspondingly large uncertainties implied for climate models. Comprehensive observations of the vertical profile of aerosol extinction are needed to accurately characterize these particles (e.g. composition, size, spatial and temporal distribution) to properly account for their climate impacts and constrain models. Satellite limb scattering measurements provide superior results for observations of stratospheric aerosols compared to occultation measurements. We are developing a compact instrument called Multi-Angle Stratospheric Aerosol Radiometer (MASTAR) that simplifies the current OMPS Limb Profiler design to fit into a 3U Cubesat configuration, and also provides important supplemental information through the use of multiple simultaneous viewing directions.
    Keywords: Geosciences (General)
    Type: GSFC-E-DAA-TN65934 , IGARSS 2018 - 2018 IEEE International Geoscience and Remote Sensing Symposium (ISSN 2153-6996) (e-ISSN 2153-7003); 18261431|IGARSS 2018 - 2018 IEEE International Geoscience and Remote Sensing Symposium; Jul 22, 2018 - Jul 27, 2018; Valencia; Spain
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    NASA TECHNICAL REPORTS
  • 3
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    Laser Beam Expander with Adjustable Collimation (2018)
    In:  CASI
    Details
    Publication Date: 2019-08-24
    Description: A laser beam expander has at least two negative lenses with adjustable collimation. The amount of required motion can be reduced by an order of magnitude over single negative lens approaches by splitting the input lens in two and adjusting the small remaining air gap between the lenses. The change in collimation may be accomplished by heating/cooling (i.e., thermal), mechanical motion (e.g., motors), electro-optical means (e.g., applying or reducing an electric current), any combination thereof, or any other suitable mechanism.
    Keywords: Lasers and Masers
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    NASA TECHNICAL REPORTS
  • 4
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    Airborne Lidar Simulator for the Lidar Surface Topography (LIST) Mission (2010)
    In:  CASI
    Details
    Publication Date: 2019-07-13
    Description: In 2007, the National Research Council (NRC) completed its first decadal survey for Earth science at the request of NASA, NOAA, and USGS. The Lidar Surface Topography (LIST) mission is one of fifteen missions recommended by NRC, whose primary objectives are to map global topography and vegetation structure at 5 m spatial resolution, and to acquire global surface height mapping within a few years. NASA Goddard conducted an initial mission concept study for the LIST mission in 2007, and developed the initial measurement requirements for the mission.
    Keywords: Lasers and Masers
    Type: 25th International Laser Radar Conference; Jul 05, 2010 - Jul 09, 2010; St.Petersburg, Russia; Russia
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    NASA TECHNICAL REPORTS
  • 5
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    Optical System Design and Integration of the Global Ecosystem Dynamics Investigation Lidar (2019)
    In:  CASI
    Details
    Publication Date: 2019-09-14
    Description: The Global Ecosystem Dynamics Investigation (GEDI) instrument was designed, built, and tested in-house at NASAs 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 Earths 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.
    Keywords: Spacecraft Instrumentation and Astrionics
    Type: GSFC-E-DAA-TN70442 , SPIE Remote Sensing; Sep 09, 2019 - Sep 12, 2019; Strasbourg; France|Proceedings of SPIE (ISSN 0277-786X) (e-ISSN 1996-756X); 11128; 111280J
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    NASA TECHNICAL REPORTS
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