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Performance Model Simulation of Ganymede Laser Altimeter (GALA) for the JUICE Mission

Araki, Hiroshi and Ishibashi, Ko and Namiki, Noriyuki and Noda, Hirotomo and Kobayashi, Masanori and Enya, Keigo and Ozaki, Masanobu and Mizuno, Takahide and Saito, Yoshifumi and Touhara, Kazuyuki and Oshigami, Shoko and Kashima, Shingo and Kimura, Jun and Kobayashi, Shingo and Steinbrügge, Gregor and Stark, Alexander and Althaus, Christian and Togno, Simone and Lingenauber, Kay and Hussmann, Hauke (2019) Performance Model Simulation of Ganymede Laser Altimeter (GALA) for the JUICE Mission. In: TRANSACTIONS OF THE JAPAN SOCIETY FOR AERONAUTICAL AND SPACE SCIENCES, 17, pp. 150-154. International Symposium on Space Technology and Science, 03.-09. Jun. 2017, Matsuyama, Japan. DOI: 10.2322/tastj.17.150

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Official URL: https://www.jstage.jst.go.jp/article/tastj/17/2/17_17.150/_article/


GALA (GAnymede Laser Altimeter) is one of the payload instruments of the JUICE (JUpiter ICy moons Explorer) project to be launched in 2022 to the Jovian icy moons Ganymede, Europa, and Callisto. GALA is developed through an international collaboration between Germany, Japan, Switzerland, and Spain. With the performance model of GALA, we have sought to create the interface conditions that satisfy the science requirements on the probability of false detection (PFD) and the range accuracy. The science requirements on GALA performance can be summarized as involving the following four criteria: [1] for Europa fly-by, PFD is less than 0.2 from an altitude of 1300 km or lower, [2] under the worst observation condition for albedo and surface slope of GCO500 (Ganymede Circular Orbit whose height is 500 km), the accuracy of ranging is less than 10 m and PFD is less than 0.2, [3] under the nominal observation condition of GCO500, the accuracy of ranging is less than 2 m and PFD is less than 0.1, and [4] under the best observation condition of GCO500, the accuracy of ranging is less than 1 m and PFD is less than 0.1. For the assessment, however, we had used literature data as the characteristics of the laser detector of GALA, avalanche photodiode (APD), which should be degraded due to the severe radiation environment around Jupiter. Then we carried out a more realistic model simulation of GALA by incorporating these degradation effects of APD. Characteristics of APD, such as gain, quantum efficiency, excess noise index, surface dark current, and bulk dark current, were re-evaluated through radiation tests using the data of dark and photo current of the APD irradiated with 2-MeV-electron and 50-MeV-proton beams, which are the radiation conditions assumed for JUICEGALA around Jupiter. These degraded characteristics of APD by radiation were introduced to our performance model of GALA. As a result, our performance simulation of GALA showed again that the science requirements are satisfied even after taking into account the degraded characteristics of APD. The remaining matter is the effect of noise or digitization in the Analog Electronics Module (AEM), which must be taken into account for the final specifications of GALA.

Item URL in elib:https://elib.dlr.de/132298/
Document Type:Conference or Workshop Item (Other)
Title:Performance Model Simulation of Ganymede Laser Altimeter (GALA) for the JUICE Mission
AuthorsInstitution or Email of AuthorsAuthors ORCID iD
Araki, HiroshiNational Astronomical Observatory of Japan,UNSPECIFIED
Ishibashi, KoPlanetary Exploration Research Center, Chiba Institute of TechnologyUNSPECIFIED
Namiki, NoriyukiNational Astronomical Observatory of JapanUNSPECIFIED
Noda, HirotomoNational Astronomical Observatory of JapanUNSPECIFIED
Kobayashi, MasanoriChiba Institute of Technology, JapanUNSPECIFIED
Touhara, KazuyukiISAS/JAXA, JapanUNSPECIFIED
Oshigami, ShokoNational Astronomical Observatory of JapanUNSPECIFIED
Kashima, ShingoNational Astronomical Observatory of JapanUNSPECIFIED
Kimura, JunOsaka University, JapanUNSPECIFIED
Kobayashi, ShingoNational Institute of Radiological SciencesUNSPECIFIED
Steinbrügge, Gregorgregor.steinbruegge (at) dlr.dehttps://orcid.org/0000-0002-1050-7759
Stark, Alexanderalexander.stark (at) dlr.dehttps://orcid.org/0000-0001-9110-1138
Althaus, ChristianChristian.Althaus (at) dlr.deUNSPECIFIED
Togno, SimoneSimone.DelTogno (at) dlr.deUNSPECIFIED
Lingenauber, Kaykay.lingenauber (at) dlr.deUNSPECIFIED
Hussmann, HaukeHauke.Hussmann (at) dlr.deUNSPECIFIED
Date:4 March 2019
Refereed publication:Yes
Open Access:No
Gold Open Access:No
In ISI Web of Science:Yes
DOI :10.2322/tastj.17.150
Page Range:pp. 150-154
Keywords:Laser Altimetry, Ganymede, GALA, JUICE
Event Title:International Symposium on Space Technology and Science
Event Location:Matsuyama, Japan
Event Type:international Conference
Event Dates:03.-09. Jun. 2017
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 11:31
Last Modified:09 Dec 2019 11:31

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