DATA_OBJECT_TYPE = SPICE_I-KERNEL MISSION_ID = 1 SPACECRAFT_NAME = GALILEO SPACECRAFT_NUMBER = 77 INSTRUMENT_ID = 34 PROCESS_TIME = 1990-11-12T12:00:00 UVS I-KERNEL =========================================================================== This I-kernel contains UVS instrument data for Earth 1. The purpose of the UVS data contained in this file is to describe the geometric relationship between the UVS Field-of-View (FOV) (slit width and length coordinates) and the coordinate system of the GLL spacecraft structure on which the UVS instrument is mounted (scan platform x-y-z coordinates). References -------------------------------------------------------- 1. Galileo UVS Functional Requirement Document GLL-625-205, 4-2034, Rev A. 2. "Galileo UVS Calibration Report, Preliminary Version" by William McClintock, dated March, 1989. 3. UVS/EUV instrument paper, Draft version, 14 June, 1990. by Charles W. Hord, et al. 4. KERNEL ``Required Reading'' file. 5. Planetary Data System Document D-6184, Data Dictionary Document, 16 February, 1990, Version 2.0 Implementation notes -------------------------------------------------------- This file is used by the SPICE system as follows: programs that make use of the I-kernel must `load' the kernel, normally during program initialization. Loading the kernel associates data items with their names in a data structure called the `kernel pool'. The SPICELIB routine LDPOOL loads a kernel file into the pool as shown below. CALL LDPOOL ( 'GLL34001.TI' ) In order for a program or subroutine to extract data from the pool, the SPICELIB routine RTPOOL is used. See [4] for more details. Naming Conventions -------------------------------------------------------- All names referencing values in this I kernel start with the characters `INS' followed by the NAIF UVS instrument number ('-77' followed by the instrument subsystem reference number). This naming scheme is standard for all I-kernel files and was instituted to distinguish I-kernel data from other types of data that may also be loaded in the kernel pool. The remainder of the name is an underscore character, followed by the unique name of the data item. For example, the UVS FOV width for the F-channel detector is specified by INS-77034_FOV_WIDTH_F The upper bound on the length of the name of any data item is 32 characters. If the same item is included in more then one file, or if the same item appears more than once within a single file, the latest value supersedes any earlier values. Definition of the UVS coordinate system -------------------------------------------------------- The following discussion is from [2]. The mounting feet of the UVS have been carefully machined in order to insure its optical alignment relative to the SSI. Alignment was determined by placing the UVS on the optic axis of a laboratory collimator and autocollimating each mounting surface with a test flat. ...In addition to the boresight test a plane miror has also been aligned to the UVS optic axis and can be periodically installed on the instrument to check its alignment to other scan platform instruments. The mounting orientation relative to the Galileo SSI is shown below. |-------- | - | | ^ |<--0.1-->| . | | 1.4 degrees | | . N and G-channel FOVs | | . | | SSI line 1, sample 1 | | SSI line 1, sample 800 ------------|---------|------------- | | | | | |-------- | - | | | | ^ | | | | . | | | | . | | | |0.4 degree | | | | . F-channel FOV o is SSI | | | . | (400,400)| | o | . | along -Z | | | . | into the| | | . | page | | | . | o = UVS | | | . | FOV center | | | . | | |<--0.1-->| . | | | | v | | |---------| - | ------------|---------|------------- SSI line 800, sample 1 | | SSI line 800, sample 800 | | | | | | | | . | | . | | v |-------- | - \section DATA \literal Field of View dimensions (units are DEGREES): \begindata INS-77034_FOV_WIDTH_F = ( 0.1 ) INS-77034_FOV_LENGTH_F = ( 0.4 ) INS-77034_FOV_WIDTH_N = ( 0.1 ) INS-77034_FOV_LENGTH_N = ( 1.4 ) INS-77034_FOV_WIDTH_G = ( 0.1 ) INS-77034_FOV_LENGTH_G = ( 1.4 ) INS-77034_LIMB_SENSOR_DIA = ( 3.0 ) \begintext Field of view center location (notice that this item is a vector) (units are in SSI [line,sample] coordinates): \begindata INS-77034_FOV_CENTER = ( 400.0 400.0 ) INS-77034_LIMB_SENSOR_CEN = ( 400.0 400.0 ) \begintext Mounting alignment offset (units are DEGREES): Twist is as defined by SSI \begindata INS-77034_TWIST_OFFSET = ( 0.0 ) \begintext Date on which the above data was entered into this I-kernel: \begindata INS-77034_DATA_ENTRY_DATE = ( @12-NOV-1990 ) \begintext Version The version number is always positive and given in the form V.X. V and X are incremented by following these rules: -- V is incremented by 1 when there is a structural change to an I-kernel. A structural change to an instrument kernel would be adding or deleting data items or changing the number of values associated with an existing data item. A structural change would also be assigning different units to values or changing the name of a data item. -- X is incremented by 1 only if pre-existing values are changed. \begindata INS-77034_VERSION = ( 1.0 )