Files - *.ATT
A Windows "INI-style" file giving the current spacecraft attitudes for
squint angle calculations. Must be manually edited (using Notepad, for
example). The file name must match the spacecraft name EXACTLY (e.g. for
"AO-10", use "AO-10.ATT", for "AO10", use "AO10.ATT"). The only exception is
that a "/" in the spacecraft name (e.g. RS-12/13) will be replaced by an
underscore (RS-12_13.ATT). Any spacecraft for which a file is not found will
be assumed to have its antennas pointing straight down (Microsat fashion - one
rotation per orbit.)
Since the attitude of controllable spacecraft changes periodically, there is a
provision to set an expiration date. If the attitude data is older than this
date, you get a warning each time WinOrbit runs, to remind you to get an
update. The expiration date must be in the
mumerical epoch
format: YYDDD.FFF.
This file is also used to provide frequency and other configuration information
for the various transponders and beacons. In the future, antenna
configurations may be included, as well as solar cell locations and the nature
of the satellite stabilization system.
Sample files are included with winorbxx.zip: AO-13.ATT, AO-10.ATT. The former
has the most recent published values for
AO-13.
Since
AO-10
is no longer under ground control, the numbers in the latter are arbitrary.
Optional file.
Sample File Content
[Attitude]
Alat = 0
Alon = 180
Expiration = 96001.0
[Beacon]
BeaconFreq = 145.825
[Transponder]
UplinkFreq = 145.825
DownlinkFreq = 29.45
TransponderInverting = true
All fields are optional. Headings (in "[]") must precede the corresponding
fields if they exist, however.
File Overview
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