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PLANETARY LANDERS AND ENTRY PROBES
This book provides a concise but broad overview of the engineering, science and
flight history of planetary landers and atmospheric entry probes – vehicles
designed to explore the atmospheres and surfaces of other worlds. It covers
engineering aspects specific to such vehicles, such as landing systems,
parachutes, planetary protection and entry shields, which are not usually treated
in traditional spacecraft engineering texts. Examples are drawn from over thirty
different lander and entry probe designs that have been used for lunar and
planetary missions since the early 1960s. The authors provide detailed
illustrations of many vehicle designs from space programmes worldwide,
and give basic information on their missions and payloads, irrespective of the
mission’s success or failure. Several missions are discussed in more detail,
in order to demonstrate the broad range of the challenges involved and the
solutions implemented. Planetary Landers and Entry Probes will form an
important reference for professionals, academic researchers and graduate students
involved in planetary science, aerospace engineering and space mission
development.
Andrew Ball is a Postdoctoral Research Fellow at the Planetary and Space
Sciences Research Institute at The Open University, Milton Keynes, UK. He is a
Fellow of the Royal Astronomical Society and the British Interplanetary Society.
He has twelve years of experience on European planetary missions including
Rosetta and Huygens.
James Garry is a Postdoctoral Research Fellow in the School of Engineering
Sciences at the University of Southampton, UK, and a Fellow of the Royal
Astronomical Society. He has worked on ESA planetary missions for over ten
years and has illustrated several space-related books.
www.cambridge.org© in this web service Cambridge University Press
Cambridge University Press978-0-521-12958-9 - Planetary Landers and Entry ProbesAndrew J. Ball, James R. C. Garry, Ralph D. Lorenz and Viktor V. KerzhanovichFrontmatterMore information
Ralph Lorenz is a Scientist at the Johns Hopkins University Applied Physics
Laboratory, USA. He is a fellow of the Royal Astronomical Society and the
British Interplanetary Society. He has fifteen years of experience in NASA and
ESA spaceflight projects and has authored several space books.
Viktor Kerzhanovich is a Principal Member of Technical Staff of the
Mobility and Robotic Systems Section of the Autonomous Systems Division,
NASA Jet Propulsion Laboratory, USA. He was a participant in all Soviet
planetary Venus and Mars entry probe programmes.
www.cambridge.org© in this web service Cambridge University Press
Cambridge University Press978-0-521-12958-9 - Planetary Landers and Entry ProbesAndrew J. Ball, James R. C. Garry, Ralph D. Lorenz and Viktor V. KerzhanovichFrontmatterMore information
PLANETARY LANDERS AND
ENTRY PROBES
ANDREW J. BALLThe Open University
JAMES R. C. GARRYSouthampton University
RALPH D. LORENZJohns Hopkins University Applied Physics Laboratory
VIKTOR V. KERZHANOVICHNASA Jet Propulsion Laboratory
www.cambridge.org© in this web service Cambridge University Press
Cambridge University Press978-0-521-12958-9 - Planetary Landers and Entry ProbesAndrew J. Ball, James R. C. Garry, Ralph D. Lorenz and Viktor V. KerzhanovichFrontmatterMore information
CAMBRIDGE UNIVERSITY PRESSCambridge, New York, Melbourne, Madrid, Cape Town, Singapore,
São Paulo, Delhi, Dubai, Tokyo
Cambridge University PressThe Edinburgh Building, Cambridge CB2 8RU, UK
Published in the United States of America by Cambridge University Press, New York
www.cambridge.orgInformation on this title: www.cambridge.org/9780521129589
© A. Ball, J. Garry, R. Lorenz and V. Kerzhanovich 2007
This publication is in copyright. Subject to statutory exceptionand to the provisions of relevant collective licensing agreements,
no reproduction of any part may take place without the writtenpermission of Cambridge University Press.
First published 2007This digitally printed version 2009
A catalogue record for this publication is available from the British Library
ISBN 978-0-521-82002-8 HardbackISBN 978-0-521-12958-9 Paperback
Cambridge University Press has no responsibility for the persistence oraccuracy of URLs for external or third-party internet websites referred to in
this publication, and does not guarantee that any content on such websites is,or will remain, accurate or appropriate.
www.cambridge.org© in this web service Cambridge University Press
Cambridge University Press978-0-521-12958-9 - Planetary Landers and Entry ProbesAndrew J. Ball, James R. C. Garry, Ralph D. Lorenz and Viktor V. KerzhanovichFrontmatterMore information
Contents
Preface page xi
Acknowledgements xii
List of acronyms and abbreviations xiii
PART I Engineering issues specific to entry probes, landers or
penetrators 1
1 Mission goals and system engineering 3
1.1 Systems engineering 3
1.2 Choice of landing site 7
2 Accommodation, launch, cruise and arrival from orbit or
interplanetary trajectory 14
2.1 The launch environment 14
2.2 Transfer-trajectory choice 15
2.3 Arrival strategies 23
3 Entering atmospheres 24
3.1 Entry dynamics 24
3.2 Thermodynamics of entry 27
3.3 TPS technologies 31
3.4 Practicalities 32
4 Descent through an atmosphere 36
4.1 Overview and fundamentals 36
4.2 Extreme ballistic coefficients 36
4.3 Drag enhancement devices 39
4.4 Parachute types 40
4.5 Testing 44
v
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Cambridge University Press978-0-521-12958-9 - Planetary Landers and Entry ProbesAndrew J. Ball, James R. C. Garry, Ralph D. Lorenz and Viktor V. KerzhanovichFrontmatterMore information
4.6 Additional components of a descent control system 45
4.7 Mars – retro-rockets in atmosphere 45
5 Descent to an airless body 47
5.1 The gravity turn 48
5.2 Efficient descent 48
5.3 Realistic trajectories 48
5.4 Example – direct descent – Surveyor 49
5.5 Examples: Luna 16 and Apollo 50
5.6 Small bodies 50
5.7 Instrumentation 51
5.8 Powered re-ascent 54
5.9 Hover 54
5.10 Combined techniques – system engineering 55
6 Planetary balloons, aircraft, submarines and cryobots 56
6.1 Balloons 56
6.2 Powered aerobots (airships) 63
6.3 Aeroplanes and gliders 66
6.4 Other heavier-than-air concepts for aerial mobility 68
6.5 Submarines, hydrobots and cryobots 69
7 Arrival at a surface 71
7.1 Targeting and hazard avoidance 71
7.2 Landing gear 72
7.3 Penetration dynamics 78
7.4 Splashdown dynamics: Titan landers, Earth-return capsules 80
8 Thermal control of landers and entry probes 84
8.1 Surface coatings and radiation balance 85
8.2 Internal heat transfer 86
8.3 Thermal environment during descent 87
8.4 Thermal testing 91
8.5 Thermal modelling 91
9 Power systems 94
9.1 System requirements 94
9.2 Power and energy budgets 95
9.3 Radioisotope sources 96
9.4 Solar power 98
9.5 Battery technology 101
9.6 Other power sources 103
vi Contents
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Cambridge University Press978-0-521-12958-9 - Planetary Landers and Entry ProbesAndrew J. Ball, James R. C. Garry, Ralph D. Lorenz and Viktor V. KerzhanovichFrontmatterMore information
9.7 Power and thermal control 103
9.8 Nuts and bolts 104
10 Communication and tracking of entry probes 105
10.1 Entry probes: communication basics 107
10.2 Main telecom equation 112
10.3 Frequency measurements 114
10.4 Data transmission 115
10.5 Link budget 117
10.6 Tracking 117
11 Radiation environment 121
12 Surface activities: arms, drills, moles and mobility 124
13 Structures 130
14 Contamination of spacecraft and planets 132
14.1 Sources of contamination 134
14.2 Current regulations for spacecraft-borne bioload 136
14.3 Techniques for cleaning and sterilizing 136
14.4 Problems specific to spacecraft 143
14.5 Cleanliness as a separate goal 145
14.6 Sample return 146
PART II Previous atmosphere/surface vehicles and their payloads 147
15 Destructive impact probes 151
16 Atmospheric entry probes 153
16.1 First Soviet Venera and Mars entry probes 153
16.2 Venera 4–8 (V-67, V-69, V-70 and V-72) entry probes 159
16.3 Pioneer Venus probes 159
16.4 VeGa AZ balloons 170
16.5 Galileo Probe 173
16.6 Huygens 175
17 Pod landers 177
17.1 Ranger Block 2 Seismo capsules 178
17.2 Luna 4–9, 13 (Ye-6 and Ye-6M) landers 179
17.3 Mars 2, 3, 6, 7 (M-71 and M-73) landers 185
17.4 Mars 96 Small Stations 186
17.5 Mars Pathfinder 190
Contents vii
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Cambridge University Press978-0-521-12958-9 - Planetary Landers and Entry ProbesAndrew J. Ball, James R. C. Garry, Ralph D. Lorenz and Viktor V. KerzhanovichFrontmatterMore information
17.6 Beagle 2 191
17.7 Mars Exploration Rovers 196
18 Legged landers 199
18.1 Surveyor landers 199
18.2 Apollo lunar modules 199
18.3 Luna 17, 21 (Ye-8) landers and the Lunokhods 203
18.4 Luna 15, 16, 18, 20 (Ye-8-5) landers 203
18.5 Luna 23, 24 (Ye-8-5M) landers 203
18.6 Soviet LK lunar lander 203
18.7 Venera 9–14 (4V-1) and VeGa (5VK) landers 203
18.8 Viking landers 203
18.9 Mars Surveyor landers 227
18.10 Mars Science Laboratory 234
19 Payload delivery penetrators 238
19.1 Mars 96 penetrators 240
19.2 Deep Space 2 Mars Microprobes 243
19.3 Lunar-A penetrators 245
20 Small body surface missions 247
20.1 Phobos 1F 247
20.2 NEAR Shoemaker 253
20.3 Rosetta lander Philae 253
20.4 Hayabusa (MUSES-C) and MINERVA 257
PART III Case studies 261
21 Surveyor landers 263
21.1 Design 264
21.2 Flight performance 265
22 Galileo probe 267
22.1 Equipment 268
22.2 Flight performance 270
23 Huygens 273
24 Mars Pathfinder and Sojourner 284
25 Deep Space 2 Mars Microprobes 289
26 Rosetta lander Philae 299
27 Mars Exploration Rovers: Spirit and Opportunity 304
viii Contents
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Cambridge University Press978-0-521-12958-9 - Planetary Landers and Entry ProbesAndrew J. Ball, James R. C. Garry, Ralph D. Lorenz and Viktor V. KerzhanovichFrontmatterMore information
27.1 The spacecraft 304
27.2 The rovers 307
27.3 Problems encountered 311
Appendix: Some key parameters for bodies in the Solar System 313Atmosphere models 313
Bibliography 316Engineering 316
Reference 319
Planetary sciences 319
Historical 320
Some useful web sites 321
References 323
Index 338
Contents ix
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Cambridge University Press978-0-521-12958-9 - Planetary Landers and Entry ProbesAndrew J. Ball, James R. C. Garry, Ralph D. Lorenz and Viktor V. KerzhanovichFrontmatterMore information
Preface
This book is intended as a concise but broad overview of the engineering, science
and flight history of planetary landers and atmospheric probes. Such vehicles
are subject to a wide range of design and operational issues that are not
experienced by ‘ordinary’ spacecraft such as Earth-orbiting satellites, or even by
interplanetary flyby or orbital craft. Such issues deserve special attention, and we
have attempted to bring together in one place brief discussions of many of these
aspects, providing pointers to more detailed (but dispersed) coverage in the wider
published literature. This volume also draws heavily on real examples of landers
and probes launched (or, at least, where the launch vehicle’s engines were started
with that intention!).
More than 45 years have passed since the first vehicles of this type were
designed. To a certain extent some past missions, of which there are over one
hundred, may now be considered irrelevant from a scientific point of view,
outdated from an engineering point of view and perhaps mere footnotes in the
broader history of planetary exploration achievements. However, we believe they
all have a place in the cultural and technical history of such endeavours, serving
to illustrate the evolving technical approaches and requirements as well as lessons
learned along the way. They stand as testament to the efforts of those involved in
their conception and implementation.
Part one of the book addresses the major engineering issues that are specific to
the vehicles considered, namely atmospheric entry probes, landers and
penetrators for other worlds. For material common to spacecraft in general we
would refer the reader to other, existing sources. Part II aims to collect together in
one place some key information on previous vehicles and their missions, with
reference to the main sources of more detailed information. Part III covers some
of these missions in further detail as ‘case studies’.
January, 2006
xi
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Cambridge University Press978-0-521-12958-9 - Planetary Landers and Entry ProbesAndrew J. Ball, James R. C. Garry, Ralph D. Lorenz and Viktor V. KerzhanovichFrontmatterMore information
Acknowledgements
The authors wish to thank Susan Francis and her colleagues at Cambridge
University Press for their encouragement and patience. Many colleagues and
contacts have helped with specific queries, including: Dave Atkinson, Aleksandr
T. Basilevsky, Jens Biele, Jacques Blamont, Peter Bond, Jim Burke, Ed Chester,
Chad Edwards, Alex Ellery, Bernard Foing, Sven Grahn, Aleksandr Gurshtein,
Leonid Gurvits, Ari-Matti Harri, Mat Irvine, Bobby Kazeminejad, Oleg
Khavroshkin, Vladimir Kurt, Bernard Laub, Mikhail Ya. Marov, Serguei
Matrossov, Michel Menvielle, Don P. Mitchell, Dave Northey, Colin T. Pillinger,
Sergei Pogrebenko, Jean-Pierre Pommereau, Lutz Richter, Andy Salmon, Mark
Sims, Oleg A. Sorokhtin, Yuri A. Surkov, Fred W. Taylor, Stephan Ulamec,
Paolo Ulivi, David Williams, Andrew Wilson, Ian P. Wright, Hajime Yano, and
Olga Zhdanovich. We would also like to thank Professor John Zarnecki and the
staff at the Open University Library. The diagrams that populate Part II were
drawn using information gleaned from a variety of sources. While researching
specific details for spacecraft, the authors were glad to receive help from the
following people: Charles Sobeck, Bernard Bienstock, Corby Waste, Pat
Flannery, Marty Tomasko, Marcie Smith, Dan Maas, Doug Lombardi, Debra
Lueb, Martin Towner, Mark Leese, Steve Lingard and John Underwood.
xii
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Cambridge University Press978-0-521-12958-9 - Planetary Landers and Entry ProbesAndrew J. Ball, James R. C. Garry, Ralph D. Lorenz and Viktor V. KerzhanovichFrontmatterMore information
List of acronyms and abbreviations
ACP Aerosol Collector/Pyrolyser
ADS Active Descent System
AFM Atomic Force Microscope
AIAA American Institute of Aeronautics and Astronautics
ALSEP Apollo Lunar Surface Experiments Package
AMICA Asteroid Multiband Imaging Camera
AMTEC Alkali Metal Thermionic Emission Technology
ANC ANChor
APEX Athena Precursor EXperiment
APX Alpha-Proton X-ray spectrometer OR Alpha Particle X-ray
spectrometer
APXS Alpha-Proton X-ray Spectrometer OR Alpha Particle X-ray
Spectrometer
ARAD Analog Resistance Ablation Detector
ARES Atmospheric Relaxation and Electric field Sensor
ASAP Ariane Structure for Auxiliary Payloads
ASI Atmospheric Structure Instrument
ATMIS ATmospheric structure and Meteorological Instrument
System
AU Astronomical Unit
AXS Alpha-X-ray Spectrometer
AZ Aerostatic Zond
BER Bit Error Rate
BOL Beginning-Of-Life
BPSK Binary Phase-Shift Keying
CASSE Cometary Acoustic Surface Sounding Experiment
CCD Charge-Coupled Device
xiii
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Cambridge University Press978-0-521-12958-9 - Planetary Landers and Entry ProbesAndrew J. Ball, James R. C. Garry, Ralph D. Lorenz and Viktor V. KerzhanovichFrontmatterMore information
CD Compact Disk
CDMS Command and Data Management System
CDMU Command and Data Management Unit
CFRP Carbon Fibre Reinforced Plastic
CHARGE CHemical Analysis of Released Gas Experiment
CIRCLE Champollion Infrared and Camera Lander Experiment
CIVA Comet nucleus Infrared and Visible Analyser
CNES Centre National d’Etudes Spatiales
CNP Comet Nucleus Penetrator
CNSR Comet Nucleus Sample Return
CoM Centre of Mass
CONSERT COmet Nucleus Sounding Experiment by Radiowave
Transmission
COSAC COmetary Sampling And Composition experiment
COSPAR COmmittee on SPAce Research
CPPP Comet Physical Properties Package
CR Cosmic Ray
CRAF Comet Rendezvous/Asteroid Flyby
CSM Command and Service Module
DAS Long-lived Autonomous Station
DC Direct Current
DCP Data and Command Processor
DESCAM DEScent CAMera
DGB Disc-Gap-Band
DIM Dust Impact Monitor
DIMES Descent Image Motion Estimation System
DISR Descent Imager – Spectral Radiometer
DLBI Differential Long Baseline Interferometer
DLR Deutsches Zentrum fur Luft- und Raumfahrt (German
Aerospace Centre)
DNA Deoxyribonucleic Acid
DoD Depth of Discharge
DPI Descent Phase Instrument
DSC Differential Scanning Calorimeter
DSN Deep Space Network
DS-2 Deep Space 2
DTE Direct To Earth
DVLBI Differential Very Long Baseline Interferometry
DWE Doppler Wind Experiment
xiv List of acronyms and abbreviations
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EADS European Aeronautic, Defence and Space Company
EASEP Early Apollo Surface Experiments Package
EDI Entry, Descent and Inflation
EDL Entry, Descent and Landing
EDLS Entry, Descent and Landing System
EEPROM Electrically-Erasable Programmable Read-Only Memory
EM ElectroMagnetic
EPDM Ethylene Propylene Diene, Modified
EPI Energetic Particles Instrument
ESA European Space Agency
ESS Environmental Sensors Suite
ETR Eastern Test Range
FBC Faster, Better, Cheaper
FBS Fan-Beam Sensor
FMCW Frequency Modulated Continuous Wave
FRCI Fibrous Refractory Composite Insulation
FSK Frequency-Shift Keying
GAP Gas Analysis Package
GCMS Gas Chromatograph/Mass Spectrometer
GCR Galactic Cosmic Ray
GPR Ground-Penetrating Radar
GRAM Global Reference Atmospheric Model
GZU Ground Sampling Device
HAD Helium Abundance Detector
HASI Huygens Atmospheric Structure Instrument
HGA High Gain Antenna
IDD Instrument Deployment Device
IDL Interactive Data Language
IF Intermediate Frequency
IKI Institute for Space Research
IMP Imager for Mars Pathfinder
IMU Inertial Momentum Unit
IPIU Instrument Power Interface Unit
IR InfraRed
ISAS Institute of Space and Astronautical Science
ISEE-3 International Sun – Earth Explorer 3
ISIS In Situ Imaging System
ITU International Telecommunication Union
IUS Inertial Upper Stage
List of acronyms and abbreviations xv
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JPL Jet Propulsion Laboratory
KEP Kinetic Energy Penetrator
KhM-VD Running Model – Wind Engine
KSC Kennedy Space Center
LAS Large Atmospheric Structure
LCPS Large Cloud Particle Size Spectrometer
LET Linear Energy Transfer
LGA Low Gain Antenna
LGC Large Gas Chromatograph
LIDAR LIght Detection And Ranging
LIR Large Infrared Radiometer
LK Lunar Ship
LM Lunar Module
LN Large Nephelometer
LNMS Large Neutral Mass Spectrometer
LRD Lightning and Radio emissions Detector
LRF Laser Range-Finder
LRV Lunar Roving Vehicle
LS Lunar Seismometer
LSFR Large Solar Flux Radiometer
LTA Lighter Than Air
MAE Materials Adherance Experiment
MAG Magnetometer
MAGNET Magnetometer for NetLander
MAHLI MArs HandLens Imager
MAPEX Microelectronics And Photonics EXperiment
MARDI MARs Descent Imager
MARIE MArtian Radiation envIronment Experiment
MB MossBauer spectrometer
MBS MossBauer Spectrometer
MECA Mars Environmental Compatibility Assessment
MECA Microscopy, Electrochemistry and Conductivity Analyser
MEDLI MSL Entry, Descent and Landing Instrumentation
MEEC Mars Experiment on Electrostatic Charging
MEKOM Meteorological Complex
MER Mars Exploration Rover
MESUR Mars Environmental SURvey
MET Meteorological Package
xvi List of acronyms and abbreviations
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MET Modular Equipment Transporter
MEx Mars Express
MFEX Microrover Flight EXperiment
MGS Mars Global Surveyor
MI Microscopic Imager
MIC Mars Microphone
MIC Microscope
MINERVA MIcro/Nano Experimental Robot Vehicle for Asteroid
Mini-TES Miniature Thermal Emission Spectrometer
MIP Mars In situ Propellant production precursor
MIS Meteorology Instrument System
MLI Multi-Layer Insulation
MMRTG Mutli-Mission Radioisotope Thermoelectric Generator
MNTK International Scientific and Technical Committee
( )
MOx Mars Oxidant experiment
MPAe Max-Planck-Institut fur Aeronomie
MPL Mars Polar Lander
MPRO atMospheric PROpagation
MSB Small Solar Battery
MSL Mars Science Laboratory (previously Mars Smart Lander)
MUPUS MUlti-PUrpose Sensors for surface and sub-surface science
MUSES-C MU Space Engineering Spacecraft C
MUSES-CN MUSES-C Nanorover
MTUR atMospheric TURbulence
MVACS Mars Volatiles And Climate Surveyor
MWIN atMospheric WINd
NASA National Aeronautics and Space Administration
NEAR Near-Earth Asteroid Rendezvous
NEIGE NEtlander Ionospheric and Geodesic Experiment
NEO Near-Earth Object
NEP Nephelometer
NFR Net Flux Radiometer
NII Scientific Research Institute
NII PDS Scientific Research Institute for Parachute Landing Service
ðÞ
NIRS Near-InfraRed Spectrometer
NMS Neutral Mass Spectrometer
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NPO Scientific Production Association
NTS NEC Toshiba Space Systems
ODS Optical Depth Sensor
ODT Orbiter Delay Time
OKB Experimental Design Bureau
ONC Optical Navigation Camera
OPTIMISM Observatoire PlaneTologIque: MagnetIsme et Sismologie
sur Mars
PANCAM PANoramic CAMera
PAW Position Adjustable Workbench
PBO Polybenzoxazole
PC Personal Computer
PCM Pulse Code Modulation
PCU Pyro Control Unit
PEN PENetrator
PI Principal Investigator
PLL Phase-Locked Loop
PLUTO PLanetary Underground TOol
PM Phase Modulation
PP Permittivity Probe
PROM Programmable Read-Only Memory
PrOP Instrument for the Evaluation of Passability
PROP-F Mobile Robot for the Evaluation of the Surface of Phobos
PROP-M Mobile Robot for the Evaluation of the Surface of Mars
PrOP-V Instrument for the Evaluation of the Surface of Venus
PSE Probe Support Equipment
PSK Phase-Shift Keying
PTFE PolyTetraFluoroEthylene
PTUW Pressure, Temperature, hUmidity and Wind
PV PhotoVoltaic
RA Robotic Arm
RAATS Robotic Arm Atmospheric Temperature Sensor
RAC Robotic Arm Camera
RAD Radiation Assessment Detector
xviii List of acronyms and abbreviations
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RAD Rocket-Assisted Descent
RADVS Radar Altimeter & Doppler Velocity Sensor
RAM Random Access Memory
RAT Rock Abrasion Tool
RF Radio Frequency
RHU Radioisotope Heater Unit
RIFMA Roentgen Isotopic Fluorescence Method of Analysis
RKK Rocket-Space Corporation
RMS Root-Mean-Square
RNII Russian Scientific Research Institute
RNII KP Russian Scientific Research Institute for Space Device
Engineering
ROLIS ROsetta Lander Imaging System
ROMAP ROsetta lander Magnetometer And Plasma monitor
RPA Retarding Potential Analyser
RTG Radioisotope Thermoelectric Generator
RX Receiving
SAA South Atlantic Anomaly
SAM Sample Analysis at Mars
SAMPLL Simplified Analytical Model of Penetration with Lateral
Loading
SAS Small Atmospheric Structure
SCS Stereo Camera System
SD2 Sampling, Drilling and Distribution system
SEIS SEISmometer
SESAME Surface Electrical, Seismic and Acoustic Monitoring
Experiments
SEU Single Event Upset
SI Systeme Internationale
SINDA Systems Improved Numerical Differencing Analyzer
SIRCA-SPLIT Silicone-Impregnated Reusable Ceramic Ablator – Second-
ary Polymer Layer-Impregnated Technique
SIS SISmometre
SLA Super-Lightweight Ablator
SMSS Soil Mechanics Surface Sampler
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SN Small Nephelometer
SNFR Small Net Flux Radiometer
SNR Signal-to-Noise Ratio
SPICE Soil Properties: thermal Inertia and Cohesion Experiment
SPIU System Power Interface Unit
SSB Space Studies Board
SSI Surface Stereo Imager
SSP Surface Science Package
SSV Small Science Vehicle OR Small Separable Vehicle
STP Soil Temperature Probe
TDL Tunable Diode Laser
TECP Thermal and Electrical Conductivity Probe
TEGA Thermal and Evolved Gas Analyzer
TIRS Transverse Impulse Rocket System
TM Thermal Mapper
TNO Trans-Neptunian Object
TPS Thermal Protection System
TsUP Mission Control Centre
TV Television
TX Transmission
UDMH Unsymmetrical DiMethyl Hydrazine
UHF Ultra High Frequency
Acceleration Measuring Device
UK United Kingdom
US United States
USA United States of America
USO Ultra-Stable Oscillator
UV UltraViolet
VCO Voltage-Controlled Oscillator
VeGa Venus-Halley
VHF Very High Frequency
VLBI Very Long Baseline Interferometry
VNIITransMash All-Russian Scientific Research Institute of Transport
Machine-Building
WAE Wheel Abrasion Experiment
WCL Wet Chemistry Laboratory
WEB Warm Electronics Box
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WW2 World War 2
XRD X-Ray Diffraction
XRF X-Ray Fluorescence
XRFS X-Ray Fluorescence Spectrometer
XRS X-Ray Spectrometer
2MV (2MB) 2nd generation Mars/Venus
3-DL 3-Dimensional Laminate
3MV (3MB) 3rd generation Mars/Venus
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