KPL/IK FC Instrument kernel =========================================================================== This instrument kernel (I-kernel) contains Framing Camera 1 (FC1) and Framing Camera 2 (FC2) optics, detector, and field-of-view parameters. Version and Date --------------------------------------------------------------------------- Version 0.1 -- May 9, 2005 -- Boris Semenov, NAIF/JPL Added radiator FOVs. Version 0.0 -- October 12, 2004 -- Boris Semenov, NAIF/JPL Initial release. References --------------------------------------------------------------------------- 1. ``Kernel Pool Required Reading'' 2. ``C-kernel Required Reading'' 3. FC ICD/MICD, latest version as of 10/12/04. 4. Dawn Frames Definition Kernel (FK), latest version. 5. FC CDR Presentations. Implementation Notes -------------------------------------------------------- Applications that need SPICE I-kernel data must ``load'' the I-kernel file, normally during program initialization. Loading the kernel using the SPICELIB routine FURNSH causes the data items and their associated values present in the kernel to become associated with a data structure called the ``kernel pool''. The application program may then obtain the value(s) for any IK data item using the SPICELIB routines GDPOOL, GIPOOL, GCPOOL. Routine GETFOV may be used if the file contains instrument field-of-view (FOV) specification. See [1] for details. This file was created with, and can be updated with a text editor or word processor. Conventions for Specifying Data -------------------------------------------------------- Data items are specified using ``keyword=value'' assignments [1]. All keywords referencing values in this I-kernel start with the characters `INS' followed by the NAIF Dawn instrument ID code, constructed using the spacecraft ID number (-203) followed by the NAIF three digit ID number for FC1 (110), FC1 radiator (119), FC2 (120), or FC2 radiator (129). These IDs are defined in [4] as follows: Instrument name ID -------------------- ------- DAWN_FC1 -203110 DAWN_FC1_RAD -203119 DAWN_FC2 -203120 DAWN_FC2_RAD -203129 The remainder of the keyword is an underscore character followed by the unique name of the data item. For example, the focal length of the FC1 is specified by INS-203110_FOCAL_LENGTH The upper bound on the length of all keywords is 32 characters. If a keyword is included in more than one file, or if the same keyword appears more than once within a single file, the last assignment supersedes any earlier assignments. Overview -------------------------------------------------------- From [TBD]: TBD Mounting Alignment -------------------------------------------------------- Refer to the latest version of the Dawn Frames Definition Kernel (FK) [4] for the FC reference frame definitions and mounting alignment information. Apparent FOV Layout -------------------------------------------------------- WARNING -- the description/diagram is this section have not been verified This section provides a diagram illustrating the FC1 and FC2 apparent FOV layout in the corresponding reference frames. ^ | direction of | flight | ^ +Xfc1 (down-track) | +Xfc2 Pixel | --- (1,1)-------|---------+ ^ | | | | | | | | | | | | | | | |5.46 deg 1024 | x-------------> +Yfc1 (cross-track) | lines | +Zfc1 | +Yfc2 | | +Zfc2 | | | | V | | --- +-------------------+ 1024 pixels/line | 5.46 deg | Boresight (+Z axis) |<----------------->| is into the page | | Optical Parameters -------------------------------------------------------- The following FC1 and FC2 nominal first order optical parameters are included in the data section below, from [5]: ----------------------------------------------------------------- parameter FC1 FC2 ----------------------------------------------------------------- Focal Length, mm 150.0 150.0 f/ratio f/8 f/8 IFOV, rad/pixel 0.00009333 0.00009333 Field of view (deg) Cross-track 5.476 5.476 Along-track 5.476 5.476 ----------------------------------------------------------------- The keywords below provide nominal data both cameras. Angular size values in the keywords are given radians, with the cross-track size being the first value and the along-track size being the second value in each pair. \begindata INS-203110_FOCAL_LENGTH = ( 150.0 ) INS-203110_F/RATIO = ( 8.0 ) INS-203110_FOV_ANGULAR_SIZE = ( 0.09557333, 0.09557333 ) INS-203110_IFOV = ( 0.00009333 ) INS-203120_FOCAL_LENGTH = ( 150.0 ) INS-203120_F/RATIO = ( 8.0 ) INS-203120_FOV_ANGULAR_SIZE = ( 0.09557333, 0.09557333 ) INS-203120_IFOV = ( 0.00009333 ) \begintext CCD Parameters -------------------------------------------------------- The FC1 and FC2 use the CCD detector of the same type with the following nominal geometry parameters, from [5]: ----------------------------------------------------------------- parameter value note ----------------------------------------------------------------- Pixel Size, microns Cross-track 14.0 Along-track 14.0 Detector Array Size Cross-track 1024 Along-track 1024 Detector Array Center Cross-track 511.5 Along-track 511.5 ----------------------------------------------------------------- The values are given in microns for PIXEL_SIZE keywords and in counts for PIXEL_SAMPLES, PIXEL_LINES, and CENTER keywords. \begindata INS-203110_PIXEL_SIZE = ( 14.0, 14.0 ) INS-203110_PIXEL_SAMPLES = ( 1024 ) INS-203110_PIXEL_LINES = ( 1024 ) INS-203110_CCD_CENTER = ( 511.5, 511.5 ) \begintext Filter Parameters --------------------------------------------------------------------------- This section contains FC1 and FC2 filter parameters. FC1 [TBD] FC2 [TBD] FOV Definitions --------------------------------------------------------------------------- This section contains definitions for the FC1 and FC2 FOVs. These definitions are provided in a format required by the SPICE (CSPICE) function GETFOV (getfov_c). The set of assignments in the data section below defines the FC1 and FC2 FOVs with respect to the corresponding frames to be a rectangle with the corners defined by the first and last pixels of the first and last lines of the CCD and the boresight along the +Z axis. This FOV definition uses angular extent style specification with the cross and along track angular sizes taken from the ``Optics Parameters'' section above. \begindata INS-203110_FOV_FRAME = 'DAWN_FC1' INS-203110_FOV_SHAPE = 'RECTANGLE' INS-203110_BORESIGHT = ( 0.000000 0.000000 150.000000 ) INS-203110_FOV_CLASS_SPEC = 'ANGLES' INS-203110_FOV_REF_VECTOR = ( 1.000000 0.000000 0.000000 ) INS-203110_FOV_REF_ANGLE = ( 2.738 ) INS-203110_FOV_CROSS_ANGLE = ( 2.738 ) INS-203110_FOV_ANGLE_UNITS = 'DEGREES' INS-203120_FOV_FRAME = 'DAWN_FC2' INS-203120_FOV_SHAPE = 'RECTANGLE' INS-203120_BORESIGHT = ( 0.000000 0.000000 150.000000 ) INS-203120_FOV_CLASS_SPEC = 'ANGLES' INS-203120_FOV_REF_VECTOR = ( 1.000000 0.000000 0.000000 ) INS-203120_FOV_REF_ANGLE = ( 2.738 ) INS-203120_FOV_CROSS_ANGLE = ( 2.738 ) INS-203120_FOV_ANGLE_UNITS = 'DEGREES' \begintext Radiator Sun Avoidance FOV Definitions -------------------------------------------------------- Sun avoidance FOV for FC1 and FC2 radiators is 175 degree cone centerered on spacecraft -X axis [3]. \begindata INS-203119_FOV_FRAME = 'DAWN_SPACECRAFT' INS-203119_FOV_SHAPE = 'CIRCLE' INS-203119_BORESIGHT = ( -1.000000 0.000000 0.000000 ) INS-203119_FOV_CLASS_SPEC = 'ANGLES' INS-203119_FOV_REF_VECTOR = ( 0.000000 1.000000 0.000000 ) INS-203119_FOV_REF_ANGLE = ( 87.5 ) INS-203119_FOV_ANGLE_UNITS = 'DEGREES' INS-203129_FOV_FRAME = 'DAWN_SPACECRAFT' INS-203129_FOV_SHAPE = 'CIRCLE' INS-203129_BORESIGHT = ( -1.000000 0.000000 0.000000 ) INS-203129_FOV_CLASS_SPEC = 'ANGLES' INS-203129_FOV_REF_VECTOR = ( 0.000000 1.000000 0.000000 ) INS-203129_FOV_REF_ANGLE = ( 87.5 ) INS-203129_FOV_ANGLE_UNITS = 'DEGREES' \begintext Optical Distortion -------------------------------------------------------- This section provides optical distortion and geometric calibration data for FC1 and FC2. FC1 [TBD]. FC2 [TBD]. Platform ID --------------------------------------------------------------------------- This number is the NAIF instrument ID of the platform on which the cameras are mounted. For both cameras this platform is the spacecraft. \begindata INS-203110_PLATFORM_ID = ( -226000 ) INS-203120_PLATFORM_ID = ( -226000 ) \begintext