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The Ganymede laser altimeter (GALA): key objectives, instrument design, and performance

Hussmann, Hauke and Lingenauber, Kay and Kallenbach, Reinald and Enya, Keigo and Thomas, Nicolas and Lara, Luisa M. and Althaus, Christian and Araki, Hiroshi and Behnke, Thomas and Castro-Marin, Jose M. and Eisenmenger, Henri and Gerber, Thomas and Herranz de la Revilla, Miguel and Hüttig, Christian and Ishibashi, Ko and Jiménez-Ortega, Jaime and Kimura, Jun and Kobayashi, Masanori and Lötzke, Horst-Georg and Lichopoj, Alexander and Lüdicke, Fabian and Martínez-Navajas, Ignacio and Michaelis, Harald and Namiki, Noriyuki and Noda, Hirotomo and Oberst, Jürgen and Oshigami, Shoko and Rodriguez Garcia, Juan Pablo and Rodrigo, Julio and Rösner, Kerstin and Stark, Alexander and Steinbrügge, Gregor and Thabaut, Pascal and Del Togno, Simone and Touhara, Kazuyuki and Villamil, Sebastian and Wendler, Belinda and Wickhusen, Kai and Willner, Konrad (2019) The Ganymede laser altimeter (GALA): key objectives, instrument design, and performance. CEAS Space Journal, 11 (4), pp. 381-390. Springer. DOI: 10.1007/s12567-019-00282-8 ISSN 1868-2502

Full text not available from this repository.

Official URL: https://link.springer.com/article/10.1007%2Fs12567-019-00282-8

Abstract

The Ganymede Laser Altimeter (GALA) is one of the ten scientific instruments selected for the Jupiter Icy Moons Explorer (JUICE) mission currently implemented under responsibility of the European Space Agency (ESA). JUICE is scheduled for launch in mid 2022; arrival at Jupiter will be by end of 2029 with the nominal science mission—including close flybys at Ganymede, Europa, and Callisto and a Ganymede orbit phase—ending by mid 2033. GALA’s main objective is to obtain topographic data of the icy satellites of Jupiter: Europa, Ganymede, and Callisto. By measuring the diurnal tidal deformation of Ganymede, which crucially depends on the decoupling of the surface ice layer from the deep interior by a liquid water ocean, GALA will obtain evidence for (or against) a subsurface ocean in a 500 km orbit around the satellite and will provide constraints on Ganymede’s ice shell thickness. In combination with other instruments, it will characterize the morphology of surface units on Ganymede, Europa, and Callisto providing not only topography but also surface roughness and albedo (at 1064 nm) measurements. GALA is a single-beam laser altimeter operating with up to 50 Hz (nominal 30 Hz) shot frequency at a wavelength of 1064 nm and pulse lengths of 5.5±2.5 ns using a Nd:YAG laser. The return pulse is detected by an Avalanche Photo Diode (APD) with 100 MHz bandwidth and is digitized at a sampling rate of 200 MHz providing range measurements with a subsample resolution of 0.1 m and surface roughness measurements from pulse-shape analysis on the scale of the footprint size of about 50 m at 500 km altitude. The instrument is developed in collaboration of institutes and industry from Germany, Japan, Switzerland, and Spain.

Item URL in elib:https://elib.dlr.de/132318/
Document Type:Article
Title:The Ganymede laser altimeter (GALA): key objectives, instrument design, and performance
Authors:
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Hussmann, Haukehauke.Hussmann (at) dlr.deUNSPECIFIED
Lingenauber, Kaykay.lingenauber (at) dlr.deUNSPECIFIED
Kallenbach, ReinaldReinald.Kallenbach (at) dlr.deUNSPECIFIED
Enya, KeigoISAS/JAXA, JapanUNSPECIFIED
Thomas, NicolasUniversität BernUNSPECIFIED
Lara, Luisa M.Instituto de Astrofisica de Andalucia (CSIC), Glorieta de la Astronomìa s/n, 18008 Granada, SpainUNSPECIFIED
Althaus, ChristianChristian.Althaus (at) dlr.deUNSPECIFIED
Araki, HiroshiNational Astronomical Observatory of Japan,UNSPECIFIED
Behnke, ThomasThomas.Behnke (at) dlr.deUNSPECIFIED
Castro-Marin, Jose M.Instituto de Astrofisica de Andalucia (CSIC), Glorieta de la Astronomìa s/n, 18008 Granada, SpainUNSPECIFIED
Eisenmenger, Henrihenri.eisenmenger (at) dlr.deUNSPECIFIED
Gerber, ThomasUniversity of BernBernSwitzerlandUNSPECIFIED
Herranz de la Revilla, MiguelInstituto de Astrofisica de Andalucia (CSIC), Glorieta de la Astronomìa s/n, 18008 Granada, SpainUNSPECIFIED
Hüttig, ChristianChristian.Huettig (at) dlr.deUNSPECIFIED
Ishibashi, KoChiba Institute of Technology, Narashino, JapanUNSPECIFIED
Jiménez-Ortega, JaimeInstituto de Astrofisica de Andalucia (CSIC), Glorieta de la Astronomìa s/n, 18008 Granada, SpainUNSPECIFIED
Kimura, JunOsaka University, JapanUNSPECIFIED
Kobayashi, MasanoriChiba Institute of Technology, JapanUNSPECIFIED
Lötzke, Horst-Georghorst-georg.loetzke (at) dlr.deUNSPECIFIED
Lichopoj, Alexanderalexander.lichopoj (at) dlr.deUNSPECIFIED
Lüdicke, FabianFabian.Luedicke (at) dlr.deUNSPECIFIED
Martínez-Navajas, IgnacioInstituto de Astrofisica de Andalucia (CSIC), Glorieta de la Astronomìa s/n, 18008 Granada, SpainUNSPECIFIED
Michaelis, HaraldHarald.Michaelis (at) dlr.deUNSPECIFIED
Namiki, NoriyukiNational Astronomical Observatory of JapanUNSPECIFIED
Noda, HirotomoNational Astronomical Observatory of JapanUNSPECIFIED
Oberst, JürgenJuergen.Oberst (at) dlr.deUNSPECIFIED
Oshigami, ShokoISAS/JAXA, JapanUNSPECIFIED
Rodriguez Garcia, Juan PabloESA, ESTEC, Noordwijk, The NetherlandsUNSPECIFIED
Rodrigo, JulioInstituto de Astrofisica de Andalucia (CSIC), Glorieta de la Astronomìa s/n, 18008 Granada, SpainUNSPECIFIED
Rösner, Kerstinkerstin.roesner (at) dlr.deUNSPECIFIED
Stark, Alexanderalexander.stark (at) dlr.dehttps://orcid.org/0000-0001-9110-1138
Steinbrügge, GregorInstitute for Geophysics, University of Texas at Austin, USAUNSPECIFIED
Thabaut, Pascalpascal.thabaut (at) dlr.deUNSPECIFIED
Del Togno, Simonesimone.deltogno (at) dlr.deUNSPECIFIED
Touhara, KazuyukiISAS/JAXA, JapanUNSPECIFIED
Villamil, SebastianDLR Institute of Planetary ResearchUNSPECIFIED
Wendler, BelindaBelinda.Wendler (at) dlr.deUNSPECIFIED
Wickhusen, KaiKai.Wickhusen (at) dlr.dehttps://orcid.org/0000-0003-2524-5285
Willner, Konradkonrad.willner (at) dlr.dehttps://orcid.org/0000-0002-5437-8477
Date:21 October 2019
Journal or Publication Title:CEAS Space Journal
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In SCOPUS:Yes
In ISI Web of Science:Yes
Volume:11
DOI :10.1007/s12567-019-00282-8
Page Range:pp. 381-390
Publisher:Springer
ISSN:1868-2502
Status:Published
Keywords:GALA, Laser Altimetry, Instrument design, Performance model
HGF - Research field:Aeronautics, Space and Transport
HGF - Program:Space
HGF - Program Themes:Space Science and Exploration
DLR - Research area:Raumfahrt
DLR - Program:R EW - Erforschung des Weltraums
DLR - Research theme (Project):Project JUICE JANUS and GALA
Location: Berlin-Adlershof
Institutes and Institutions:Institute of Planetary Research > Planetary Geodesy
Institute of Planetary Research > Planetary Sensor Systems
Deposited By: Stark, Alexander
Deposited On:09 Dec 2019 15:36
Last Modified:14 Dec 2019 04:28

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