Navigation and Ancillary Information Facility

33 Pages·2013·2.13 MB·English

Introduction au logiciel
SPICE
Xavier Bonnin
1
Qu’est-ce que c’est?
N IF
Breadth of Use
Navigation and Ancillary Information Facility
• •  The original focus of SPICE was on ancillary data and
Logiciel développé et maintenu par le Navigation and
associated software needed by scientists for:
Ancillary Information Facility (NAIF) situé au Jet Propulsio– nin itial science data analysis
–  science archive preparation
Laboratory (JPL) à Pasadena (Californie)
•  The scope of SPICE usage has grown to cover the full
•
Utilisé pour l’ensemble des projets NASA d’exploration
mission lifecycle, as well as post-mission archive uses.
planétaire (Missions martiennes, Cassini, Deep Impact,
Messenger, Juno)
Mission concept Mission design Detailed science Science archive
development validation observation planning preparation
•
Support à certaines missions «astrophysiques» (Hubble, Spitzer,
Mission Lifecycle Archive
Kepler, etc.)
Mission Mission operations Initial science Science archive
design support data analysis user support
•
Utilisé pour de nombreuses missions européennes (Smart-1,
Mars/Venus Express, Rosetta, Huygens, etc.), russes (MTutaoriralss In trod9uct6ion) , 3
japonaises (Hayabusa, SELENE), indienne (Chandrayaan-1)
•
Utilisé pour le NASA DSN
2
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What are “Ancillary Data?”
A quoi ça sert?
Navigation and Ancillary Information Facility
Orientation
and size/
shape
Antenna
of Earth
reference
frame Sun
Spacecraft EME 2000
Reference frames reference frame
Earth (J2000)
Positions Solar System Barycenter
Orientations

Sizes/shapes
Instrument
reference frame
Relative positions
Pointing
of spacecraft and
Other solar system bodies
Orientation
of spacecraft
Orientation
and size/
shape
of planet
Pointing of
Instrument Planet
field-of-view

Time Conversion Logs of Commands Quoi est où par rapport à quoi (à
Calculations and Events
Overview of SPICE quel moment et dans quel repère)3?
(spice_overview, p3)
3
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Genesis of the SPICE Acronym*
Navigation and Ancillary Information Facility
Ça veut dire quoi?
Spacecraft
S
Planet
P
I
Instrument
C-matrix
C
E Events
* Coined by Dr. Hugh Kieffer, USGS Astrogeology Branch, Flagstaff AZ
Overview of SPICE 8
(spice_overview, p8)
4
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Angular Constraints
Exemple 1
Navigation and Ancillary Information Facility
Required Kernels:
J2 0 00 • Generic LSK
Su n F ra m e
• Mission FK
Su n d ir ec t i o n
CA SS I N I
i n t h e NA C f ra m e
• Spacecraft SCLK
SS B
IS S NA C
• Camera IK
F ra me
• Planetary
A n gl e b et w ee n
Ephemeris SPK
N A C Bo re si gh t
S/ C
an d S u n di re ct i on • Spacecraft SPK
F ra me
Sa t u rn
• Spacecraft CK
J2 0 00
F ra m e
NA C Bo re si gh t
Check whether the angle between the camera boresight and the
direction to the Sun is within the allowed range:
CALL SPKPOS( ‘SUN’, ET, ‘CASSINI_ISS_NAC’, ‘LT+S’, ‘CASSINI’, SUNVEC, LT )
ANGLE = VSEP( NAC_BORESIGHT_nac, SUNVEC )
IF ( ANGLE .LE. CONSTRAINT ) WRITE(*,*) ‘WE ARE IN TROUBLE!’
Using Frames 4
(using_frames, p4)
5
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Angles at the Surface
Exemple 2
Navigation and Ancillary Information Facility
J2000

Required Kernels:
SSB

Frame

• Generic LSK
• Generic PCK
• Mission FK
Sun

• Planetary
Solar Ephemeris SPK
J2000

Sun Direction
EL
Frame • Satellite

In Local Level Solar
Ephemeris SPK

Frame AZ

• Landing Site SPK
Titan

Local Level

Fr a m e a t t h e Ti t a n ‘ s I A U
pr o b e L a n d i n g Bo d y - f i x e d
Si t e fr a m e
Compute solar azimuth and elevation at the Huygens probe landing site
CALL SPKPOS(‘SUN’,ET,‘HUYGENS_LOCAL_LEVEL’,‘LT+S’,‘HUYGENS_PROBE’,SUNVEC,LT)
CALL RECLAT(SUNVEC, R, AZIMUTH, ELEVATION)
ELEVATION = -ELEVATION
IF (AZIMUTH .LT. 0.D0) THEN
AZIMUTH = AZIMUTH + TWOPI()
ENDIF
Using Frames 5
(using_frames, p5)
6
Exemple 3
N IF
Relative Position of Sensors
Navigation and Ancillary Information Facility
Required Kernels:
• Generic LSK
MAG+Y

fr a m e • Mission FK
MA G - Y p o s i t i o n r e l a t i v e M A G + Y • Structure
Locations SPK
• Spacecraft SCLK
• Solar Array CK
+Y Gimbal

frame

MAG-Y

frame
S/C Frame

-Y H i n g e -Y G i m b a l
fr a m e fr a m e
Find the position of one MGS MAG sensor with respect to the other in
the MGS s/c frame. Also find the relative orientation of the sensors:
CALL SPKEZR(‘MGS_MAG-Y’, ET, ‘MGS_SPACECRAFT’, ‘NONE’, ‘MGS_MAG+Y’, STATE, LT)
CALL PXFORM(‘MGS_MAG_+Y_SENSOR’, ‘MGS_MAG_-Y_SENSOR’, ET, MAT)
Using Frames (using_frames, p6)6
7
Exemple 4 (officieux)
Steins vu par VIRTIS/OSIRIS sur Rosetta
(Version Alpha)
8
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Angular Constraints
Inputs/Outputs
Navigation and Ancillary Information Facility
Required Kernels:
J2 0 00 • Generic LSK
Su n F ra m e
• Mission FK
Su n d ir ec t i o n
CA SS I N I
i n t h e NA C f ra m e
• Spacecraft SCLK
SS B
IS S NA C
• Camera IK
F ra me
• Planetary
A n gl e b et w ee n
Ephemeris SPK
N A C Bo re si gh t
S/ C
an d S u n di re ct i on • Spacecraft SPK
F ra me
Sa t u rn
• Spacecraft CK
J2 0 00
F ra m e
NA C Bo re si gh t
Check whether the angle between the camera boresight and the
direction to the Sun is within the allowed range:
CALL SPKPOS( ‘SUN’, ET, ‘CASSINI_ISS_NAC’, ‘LT+S’, ‘CASSINI’, SUNVEC, LT )
ANGLE = VSEP( NAC_BORESIGHT_nac, SUNVEC )
IF ( ANGLE .LE. CONSTRAINT ) WRITE(*,*) ‘WE ARE IN TROUBLE!’
Target (objet) Observer (objet)
Using Frames 4
(using_frames, p4)
9
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Overview - 1
Gestion des names/IDs
Navigation and Ancillary Information Facility
•  SPICE uses IDs and names to identify:
–  physical objects
–  reference frames
•  An ID is an integer number
•  A name is a text string
•  IDs are used primarily as data identifiers inside
SPICE kernels
•  Names are used primarily as input and output
arguments in SPICE software interfaces (APIs)
(naif_ids, p2)
10
NAIF IDs and Names 2