File: TORUS1:[GLL_RAW.INFO]HOW_TO_PROCESS_KERNELS.DOC
				June 4, 1996 - Greg Rutz
				Jan 07, 98 - update ; KES

Kernel Processing
---------------------------------------------------------------

Kernels give us information about the spacecraft as well as 
information about the locations of planets and stars.  C-Kernels 
tell us about the pointing of the scan platform, how fast the 
rotating portion of the spacecraft is spinning, and spacecraft 
position and z-axis pointing data.  SPK kernals tell us about 
the locations of the planets, stars, moons, and other celestial
objects.  GGGS uses these kernals to help us simulate what
Galileo will actually encounter on its mission.

Rotor C-Kernels look like --> CK<kernel name or date>.RTR
Rotor C-Kernels belong in:

		TORUS1:[GLL_RAW.SPICE_KERNELS.RTR]

Scan Platform C-Kernels look like --> CK<kernel name or date>.PLT
Scan Platform C-Kernels belong in:

		TORUS1:[GLL_RAW.SPICE_KERNELS.PLT]

SPK Kernels look like -->  S<kernel name or date>.BSP
SPK Kernels belong in:

		TORUS1:[GLL_RAW.SPICE_KERNELS.SPK]

   Spice kernels need to be renamed according to this convention:

		SPK_<orignal filename>.BSP 

----Notes for all kernel types-----

If a kernel is updated or re-released (that is, if the new kernel
has the same name as a kernel already in our directory), you need 
to rename the new kernel so that its name would come alphabetically
after the old version.  This usually involves adding a letter to 
the end of the original filename.

For example:  If the new kernel is called  -- S960124.BSP  AND
there is a kernal in the SPK directory named -- SPK_S960124A.BSP,
The new kernel could be named -- SPK_S960124B.BSP

-----

When a new kernel is released, another file called a LABEL file is
released along with it.  Every one of the aforementioned directories
contains a subdirectory called [.LBL].  Copy over the label file for
every new kernel and place it in the appropriate directory.
 
-----Locating missing kernels---------

If GGGS ever crashes because it cannot find and appropriate C or
SPK kernel, you can determine which kernel is missing by accessing
the Galileo Science Catalog at:

	http://sdtss10/jpl.nasa.gov/gllgsc.html

Simply enter the time that the kernel should cover along with the 
type of kernel you are looking for and the server will give you 
a list of the kernels of that type for that period of time.  If the
kernel is not on our VAX, we should have it backed up on 9-track
tape.

;;kes from this point down

	Kernel files may also be found on the GLLSVC Vax machine. This
is somewhat easier since these files are in Vax Binary format and do not
need to be copied as transfer files (ASCII text) and then converted.

  1) Log onto the GLLSVC machine with the KSIMMONS account name.
  2) Look at the directory $10$DUA4:[GSC.SPICE.CKER.BIN] to see what files
	are currently available there. (You should be able to do a search 
	using the orbit name.) 
  3) Use a COPY from GLLSVC::$10$DUA4:[GSC.SPICE.CKER.BIN]file to our
	directory.
  4) Then copy the label file from the $10$DUA4:[GSC.SPICE.CKER.LAB]
	directory to ours.

;;;kes