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