KPL/IK

Huygens DISR Instrument Kernel
========================================================================

   This Huygens SPICE instrument kernel (I-kernel)
   contains the instrument geometric parameters for the 
   Descent Imager/Spectral Radiometer. The three imagers
   are defined with respect to the HUYGENS_DISR frame.


Version and Date
--------------------------------------------------------
 
   Version 1.0 -- August, 2018 - Alfredo Escalante
   
 
Contact Information
--------------------------------------------------------


References
--------------------------------------------------------
 
   1. Data Archive Users’ Guide for the Descent Imager 
   and Spectral Radiometer (DISR) on the Huygens Probe
   ("https://atmos.nmsu.edu/PDS/data/hpdisr_0001/DOCUMENT
   /DISR_SUPPORTING_DOCUMENTS/DISR_DATA_USERS_GUIDE/")
 

Instrument Overview
--------------------------------------------------------

	The DISR camera consists of three imagers oriented vertically 
	(see Figure 2.2).  All three take pictures in the probes +Z 
	direction (in azimuth), cf. With the Side Looking 
	Imager (SLI) viewing from 6º above the horizon to nearly 45° 
	below the horizon (by 25.6º wide), the Medium Resolution Imager 
	(MRI or DLI2) picks up at 44º degrees below the horizon 
	(1 degree overlap), and extends down to ~16° from Nadir 
	(21.1º wide).  The High Resolution Imager (HRI or DLI1) 
	overlaps significantly with the MRI, covering angles from 
	6.4º to 21.6º above Nadir but is only 9.6º wide.  
	
	The three imagers are exposed simultaneously yielding a 
	combined image that covers from 6º above the horizon to 
	about 6º above nadir, and is mostly about 25° wide.

	
FOV Definition
---------------------------------------------------------------------------

      \begindata

		 INS-150101_FOV_FRAME                 = 'HUYGENS_DISR'
         INS-150101_FOV_SHAPE                 = 'RECTANGLE'
         INS-150101_BORESIGHT                 = ( -0.3338 0.0 +0.9426 )
         INS-150101_FOV_CLASS_SPEC            = 'ANGLES'
         INS-150101_FOV_REF_VECTOR            = ( 0.0 +1.0 0.0 )
         INS-150101_FOV_REF_ANGLE             = ( 12.8 )
         INS-150101_FOV_CROSS_ANGLE           = ( 25.5 )
         INS-150101_FOV_ANGLE_UNITS           = 'DEGREES'
	  
		 INS-150102_FOV_FRAME                 = 'HUYGENS_DISR'
         INS-150102_FOV_SHAPE                 = 'RECTANGLE'
         INS-150102_BORESIGHT                 = ( -0.8572 0.0 +0.515 )
         INS-150102_FOV_CLASS_SPEC            = 'ANGLES'
         INS-150102_FOV_REF_VECTOR            = ( 0.0 +1.0 0.0 )
         INS-150102_FOV_REF_ANGLE             = ( 10.55 )
         INS-150102_FOV_CROSS_ANGLE           = ( 15 )
         INS-150102_FOV_ANGLE_UNITS           = 'DEGREES'
		 
		 INS-150103_FOV_FRAME                 = 'HUYGENS_DISR'
         INS-150103_FOV_SHAPE                 = 'RECTANGLE'
         INS-150103_BORESIGHT                 = ( -0.9703 0.0 +0.2419 )
         INS-150103_FOV_CLASS_SPEC            = 'ANGLES'
         INS-150103_FOV_REF_VECTOR            = ( 0.0 +1.0 0.0 )
         INS-150103_FOV_REF_ANGLE             = ( 4.8 )
         INS-150103_FOV_CROSS_ANGLE           = ( 7.6 )
         INS-150103_FOV_ANGLE_UNITS           = 'DEGREES'
		 
      \begintext

Platform ID
---------------------------------------------------------------------------

   This number is the NAIF instrument ID of the platform on which the
   camera is mounted.

      \begindata

      INS-150101_PLATFORM_ID  = ( -150000 )

      \begintext