karn@petrus.UUCP (12/23/84)
**** UoSAT Bulletin-104 (Edited) 14th December 1984 ****
UoSAT Spacecraft Control Centre, University of Surrey, England
** GENERAL NEWS **
* UoSAT-OSCAR-11 Stabilisation *
Automatic attitude control manoeuvres, carried out by the
on-board computer over last weekend, have successfully restored
gravity-gradient stabilisation to the UO-11 spacecraft. The
spacecraft was inadvertantly destabilised a month previously
during a routine despin manoeuvre causing UO-11 to go into a
complex tumbling motion. Several weeks of navigation data
analysis, followed by four days of autonomous attitude
manouevres by the OBC were necessary to de-tumble the
spacecraft and recapture gravity lock. The autonomous
manoeuvres could be seen by those monitoring the multiple orbit
magnetometer data surveys - the attitude algorithm was
initiated after the first orbit displayed. Gravity lock, at
present, looks even better than before - we shall try to keep
it that way! We are back in business!
* NOAA-9 *
NOAA-9 was launched at 10:42 gmt on 12 December - no additional
information available at present.
** UoSAT-Oscar-9 Schedule **
This weeks schedule is as follows:
Friday - load Bulletin
Saturday - Bulletin/DIGITALKER/1200 bps telemetry
Sunday - Bulletin/DIGITALKER/1200 bps telemetry
Monday - Bulletin/DIGITALKER/1200 bps telemetry
Tuesday - Radiation data - next week CCD data
Wednesday - Whole orbit telemetry survey
Thursday - Computer check-summed telemetry
The 2 GHz Beacon will be in use this week.
** UoSAT-Oscar-11 Operations **
DAY ORBIT CHANNELS RESET TIME
*** ***** ******** **********
Friday 4100 reset telemetry calendar-clock
load auto-attitude control s/w
2,3, 10:40:50
4101 check auto-att.cntrl s/w
arm magnetorquers
commence auto-attitude control
4105 whole orbit data dump
4107 back to 1200 tlm!
Saturday 4107 whole orbit data dump
continue attitude control
Sunday continue attitude control
Monday 4150 whole orbit data dump
Tuesday 4158 2,3 09:53:16
4159 1.2GHz uplink tests
4164 2,3 19:29:15
Wednesday 4172 2,3 08:57:08
4173 terminate attitude control
4179 1,2,3,52 20:07:28
4180 2,3 21:42:40
tlm speed to 600 bps
multiple orbit survey dump
Thursday 4187 1,2,3,52 09:36:00
tlm to 1200 bps
4193 2,3 19:01:10
(OBC told to change d/link from TLM to ODATA after 6hrs)
Friday 4202 Despin from Zspin=1.9 mins
** Thanks for Reports & Questionnaire Returns ** I2KBD, ZL1MO,
JA2WO,
This week: W.T.Smith, DL7OU