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Subsections



D.4 Aperture Programmed Pointing History (APPM)

This file contains the history of the aperture pointing when the spacecraft was in Programmable Pointing Mode (PPM), normally around perigee passage. History of the aperture pointing in this mode does not appear in the APPH file. It was routinely used to calculate the evolving pointing history of the spacecraft pointing in the IIPH or CIPH near the beginning and end of an orbit.

D.4.1 Primary header

The APPM file contains a primary header with the fields described in Table D.8. In this example non-mandatory fields are filled with example values.

Table D.8: APPM primary header.
Keyword Value Description
SIMPLE = T /
BITPIX = 8 /
NAXIS = 0 /
EXTEND = T /
ORIGIN = 'ESA ' / European Space Agency
TELESCOP = 'ISO ' / Infrared Space Observatory
COMMENT   Attributes of instantiated Observations
FILENAME = 'APPM ' / File name in ISO archive
DATE = '09/07/95' / Creation date
FILEVERS = '0298 ' / Version ID in ISO archive
OLPVERS = 'OLP_21 ' / SOC OLP system version
CALGVERS = 'CALG_31 ' / SOC OLP CAL-G files version
USERNAME = 'PIPELINE' /
CREATOR = 'MAKE_APPM v1.0' /Application that created the file
DATE-OLD = '1999-08-16' / Date of original creation by IDT

D.4.2 Records

The APPM file contains records described in Table D.9.

Table D.9: APPM records.
Keyword Number Format Description
POFUTS 1 A11 / Planned start time of PPM episode
EPISODE 1 A9 / 'PPM_EXIT' or 'PPM_ENTRY'
INDEX 1 A9 / PPM index number
APERTURE 1 A2 / Aperture in use = `X0'
REQTYPE 1 A1 / Type of pointing request = `X'
UTCS 2 I4 / UTC time key of actual PPM start
UTCE 2 I4 / UTC time key of actual PPM end
UTKS 1 I4 / UTK time key of actual PPM start
UTKE 1 I4 / UTK time key of actual PPM end
RA 1 R8 / RA of reference PPM direction, in degrees
DEC 1 R8 / DEC of reference PPM direction, in degrees
ROLL 1 R8 / ROLL of reference PPM direction, in degrees
STRQ 4 R8 / Reference Star-Tracker quaternion
REV 1 I4 / Revolution
LENGTH 1 I4 / Number of PPM AOCS frames
SPARE 1 8A / Spare


next up previous contents index
Next: D.5 Executed Observation History Up: D. Satellite Files Previous: D.3 Aperture Pointing History
ISO Handbook Volume I (GEN), Version 2.0, SAI/2000-035/Dc