AAPP V5.2 Update Release, 05/09/2005
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Contents
--------
Update 5.2 comprises the following three subroutines. The destination directory
is in brackets after each subroutine name.

  decommutation.F (AAPP/sources/decommutation/decommutation)
  amsout.F        (AAPP/sources/decommutation/decommutation)
  tle_satpos.F    (AAPP/sources/libs/libtle)
  
Installation
------------
To install, please download the files (binary ftp), copy each one to the
destination directory as specified above, then re-build the following tasks
using INST_5 option 6:

  sub-option 13 - libtle 
  sub-option 17 - nav_main
  sub-option 16 - decommutation
  
The changed executables (in AAPP/bin) are satpostle.exe and decommutation.exe

Description of changes
----------------------
1) A bug correction in the calculation of orbit number for use in the file
names, when using 2-line elements. Version 5.1 could occasionally give an orbit
number that differed by 1 orbit from the orbit number obtained using TBUS
routines. (tle_satpos.F).

2) Adjust the time stamps for the MHS instrument so that they are 1 scan line
(2.667 sec) earlier than for v5.1. This corrects a 16km navigation error. The
error is thought to be associated with data buffering on the spacecraft; NOAA
have confirmed that a 1 scan line correction is optimum. (amsout.F)

3) Ignore duplicate HRPT minor frames - i.e. if the time stamp is the same as
that from the previous minor frame. This problem has been observed in some data
from an EARS station, and the solution is thought to be generally useful. 
(decommutation.F)

4) Allow file names of up to 256 characters as input to decommutation task.
In v5.1 the length was restricted to 80 characters. (decommutation.F)