KPL/IK Juno MWR Instrument Kernel =============================================================================== This Instrument Kernel (IK) file contains parameters and FOV definitions for the JUNO MicroWave Radiometer (MWR) antennas. Version and Date ------------------------------------------------------------------------------- Version 0.2 -- June 15, 2017 -- Boris Semenov, NAIF Filled in Instrument Description based on [6]. Version 0.1 -- March 17, 2012 -- Boris Semenov, NAIF Corrected FOV extents based on review feedback by Michael A. Janssen. Version 0.0 -- June 12, 2009 -- Boris Semenov, NAIF Initial Release. References ------------------------------------------------------------------------------- 1. Kernel Pool Required Reading 2. GETFOV, getfoc_c, cspice_getfov headers 3. JUNO FK file, latest version 4. MWR CDR Presentations 5. MWR MICD 6. MWR PDS3 catalog file, INST_MWR.CAT, Rev 2015-05-07 Contact Information ------------------------------------------------------------------------------- Boris V. Semenov, NAIF/JPL, (818)-354-8136, Boris.Semenov@jpl.nasa.gov Implementation Notes ------------------------------------------------------------------------------- This file is used by the SPICE system as follows: programs that make use of this kernel must ``load'' the kernel, normally during program initialization. The SPICE routine FURNSH loads a kernel file into the pool as shown below. CALL FURNSH ( 'frame_kernel_name; ) -- FORTRAN furnsh_c ( "frame_kernel_name" ); -- C cspice_furnsh, frame_kernel_name -- IDL cspice_furnsh( 'frame_kernel_name' ) -- MATLAB Once the file has been loaded, the SPICE routine GETFOV (getfov_c in C, cspice_getfov in IDL and MATLAB) can be used to retrieve FOV parameters for a given instrument or structure. This file was created and may be updated with a text editor or word processor. Naming Conventions ---------------------------------------------------------- All names referencing values in this IK file start with the characters `INS' followed by the NAIF JUNO spacecraft ID number (-61) followed by a NAIF three digit ID code for one of the MWR antennas. This is the full list of names and IDs for the MWR antennas described by this IK file: JUNO_MWR_A1 -61601 JUNO_MWR_A2 -61602 JUNO_MWR_A3 -61603 JUNO_MWR_A4 -61604 JUNO_MWR_A5 -61605 JUNO_MWR_A6 -61606 The remainder of the keyword name is an underscore character followed by the unique name of the data item. For example, the MWR/A1 boresight direction in the JUNO_MWR_A1 frame is specified by: INS-61601_BORESIGHT The upper bound on the length of the name of any data item is 32 characters. If the same item is included in more than one file, or if the same item appears more than once within a single file, the latest value supersedes any earlier values. Instrument Description --------------------------------------------------------- From [6]: The MWR instrument comprises what are essentially six independent radiometers, each of which measures the microwave emission viewed through its own independent antenna. The six antennas are distributed around the spacecraft body and view in a direction perpendicular to the spin axis of the spacecraft. Since the spin axis of the spacecraft is oriented approximately perpendicular to the orbit plane, the beam of each antenna sweeps through a great circle on the sky that passes along the sub-spacecraft track on Jupiter and through the nadir direction. Each point along this track is thus observed numerous times, at different emission angles, as the spacecraft spins and moves along its orbit. The accumulated data at each such point and its dependence on emission angle an frequency is then analyzed to obtain vertical atmospheric composition and structure using a radiative transfer model. Mounting Alignment -------------------------------------------------------- Refer to the latest version of the Juno Frames Definition Kernel (FK) [3] for the MWR reference frame definitions and mounting alignment information. MWR Antenna FOVs ---------------------------------------------------------- The MWR Antenna FOVs are defined as circular cones with half-angles of 11 degrees for A1 and A2 and 6 degrees for A3, A4, A5, and A6, centered on the boresight -- +Z axis of the corresponding JUNO_MWR_* frame. \begindata INS-61601_FOV_FRAME = 'JUNO_MWR_A1' INS-61601_FOV_SHAPE = 'CIRCLE' INS-61601_BORESIGHT = ( 0.0, 0.0, 1.0 ) INS-61601_FOV_CLASS_SPEC = 'ANGLES' INS-61601_FOV_REF_VECTOR = ( 0.0, 1.0, 0.0 ) INS-61601_FOV_REF_ANGLE = ( 11.0 ) INS-61601_FOV_ANGLE_UNITS = 'DEGREES' INS-61602_FOV_FRAME = 'JUNO_MWR_A2' INS-61602_FOV_SHAPE = 'CIRCLE' INS-61602_BORESIGHT = ( 0.0, 0.0, 1.0 ) INS-61602_FOV_CLASS_SPEC = 'ANGLES' INS-61602_FOV_REF_VECTOR = ( 0.0, 1.0, 0.0 ) INS-61602_FOV_REF_ANGLE = ( 11.0 ) INS-61602_FOV_ANGLE_UNITS = 'DEGREES' INS-61603_FOV_FRAME = 'JUNO_MWR_A3' INS-61603_FOV_SHAPE = 'CIRCLE' INS-61603_BORESIGHT = ( 0.0, 0.0, 1.0 ) INS-61603_FOV_CLASS_SPEC = 'ANGLES' INS-61603_FOV_REF_VECTOR = ( 0.0, 1.0, 0.0 ) INS-61603_FOV_REF_ANGLE = ( 6.0 ) INS-61603_FOV_ANGLE_UNITS = 'DEGREES' INS-61604_FOV_FRAME = 'JUNO_MWR_A4' INS-61604_FOV_SHAPE = 'CIRCLE' INS-61604_BORESIGHT = ( 0.0, 0.0, 1.0 ) INS-61604_FOV_CLASS_SPEC = 'ANGLES' INS-61604_FOV_REF_VECTOR = ( 0.0, 1.0, 0.0 ) INS-61604_FOV_REF_ANGLE = ( 6.0 ) INS-61604_FOV_ANGLE_UNITS = 'DEGREES' INS-61605_FOV_FRAME = 'JUNO_MWR_A5' INS-61605_FOV_SHAPE = 'CIRCLE' INS-61605_BORESIGHT = ( 0.0, 0.0, 1.0 ) INS-61605_FOV_CLASS_SPEC = 'ANGLES' INS-61605_FOV_REF_VECTOR = ( 0.0, 1.0, 0.0 ) INS-61605_FOV_REF_ANGLE = ( 6.0 ) INS-61605_FOV_ANGLE_UNITS = 'DEGREES' INS-61606_FOV_FRAME = 'JUNO_MWR_A6' INS-61606_FOV_SHAPE = 'CIRCLE' INS-61606_BORESIGHT = ( 0.0, 0.0, 1.0 ) INS-61606_FOV_CLASS_SPEC = 'ANGLES' INS-61606_FOV_REF_VECTOR = ( 0.0, 1.0, 0.0 ) INS-61606_FOV_REF_ANGLE = ( 6.0 ) INS-61606_FOV_ANGLE_UNITS = 'DEGREES' \begintext End of the IK file.