ISOCAM Interactive Analysis User's Manual Version 5.0 - ISO - ESA

15.2. OBSERVATION DATA STRUCTURES 167
19. HK: Substructure containing house-keeping parameters.
For every IMAGE/FRAME pair there is a set of house-keeping parameters. These are
listed in the table below. The index, i, refers to the HK parameters for the i-th IM-
AGE/FRAME pair. As an example, if you wish to obtain the UTK of the first IM-
AGE/FRAME pair in the SCD you could try the following:
CIA> print, scd_get(’hk(0).utk’, scd_of_interest)
subfield
HK(i).DMA COUNTER
HK(i).UTK
HK(i).QLA FLAG
HK(i).NGLITCH
HK(i).STABLE
HK(i).DU
HK(i).DV
description
Rank of IMAGE/FRAME
Uniform Time Key of frame
Quick Look Analysis flag
number of glitches detected in IMAGE
denotes stability of IMAGE/FRAME: 0=unstable, 1=stable
jitter offsets in spacecraft x-axis
jitter offsets in spacecraft y-axis
20. CAL: Structure containing original encoded parameters taken directly from the data
product FITS file (see ISO Data Product Document).
The following example displays the contents of CAL.
CIA> cal=scd_get(’cal’,’CSCD143006010214_96090420275809’)
CIA> help, cal, /str
** Structure CAL_STRUC_2, 14 tags, length=28:
TYPE INT 33
COMMANDER INT 1
TELEMETRY INT 100
DEID INT 1
MODE INT 1
OBC INT 0
TINT INT 36
EWHL INT 308
SWHL INT 88
PFOV INT 360
FCVF INT 275
GAIN INT 1
OFFSET INT 1
SPARE INT 0
With the exception of .CAL.OBC (see Section 15.2.2.3), these parameters are of little use
to the typical user. Their values as they appear in .CAL are encoded. CIA decodes these
values into a user-friendly and readable format. In some cases the parameter name itself is
changed to make it more intelligible, e.g. FCVF is FLTRWHL in the CIA data structure
(see Section 15.2.1).