UO-11 (UoSAT OSCAR)
In just six months time engineers at the University of Surrey developed, built and launched on 01-03-1984 UoSAT-2 as a piggyback payload aboard a U.S. Thor-Delta rocket carrying the LANDSAT-D earth observation satellite from Vandenberg Air Force base in the orbit. With 70 kg was UoSAT-2, the first satellite with advanced digital “store-and-forward (email)” communication with back-programmable microprocessor and contactless memories. To include different payload experiments: a speech synthesizer (Alker digit), with the messages or telemetry values can be output, a CCD camera and radiative and particle sensors. With RO-11 were carried out long-term studies of radiation effects on VLSI electronic components and scientific Liche releases. UO-11 telemetry transmits with 1k2, 7 data bits, even parity, 2 stop bits, the output power is 500 mW. Surrey’s second satellite “celebrated” his 21st this year Birthday in orbit.
Orbital parameters
Name UO-11 NORAD 14781 COSPAR designation 1984-021-B Inclination (degree) 97.953 RAAN 251.554 Eccentricity 0.0008273 ARGP 325.265 Orbit per day 14.80486133 Period 1h 37m 15s (97.25 min) Semi-major axis 7006 km Perigee x apogee 622 x 634 km Drag factor 0.000065335 1/ER Mean Anomaly 34.801
Downlink
Beacon: 145.825 MHz (FM 1k2 AFSK ASCII)
Mode and Antenna Polarization
V: LHCP
Telemetry
Channel Name Equation ------- ------------------------------ -------- 0 Array -Y Curr. (mA) (N * -1.9)+980.4 1 Nav. Mag X (uT) (N * 0.1485)-68 2 Nav. Mag Z (uT) (N * 0.1523)-69.3 3 Nav. Mag Y (uT) (N * 0.1507)-69 4 Sun Sensor 1 (V) (N * 0.01)+0 5 Sun Sensor 2 (V) (N * 0.01)+0 6 Sun Sensor 3 (V) (N * 0.01)+0 7 Sun Sensor 4 (V) (N * 0.01)+0 8 Sun Sensor 5 (V) (N * 0.01)+0 9 Sun Sensor 6 (V) (N * 0.01)+0 10 Array +Y Curr. (mA) (N * -1.9)+980.4 11 NavMag wing Temp (Deg C) (N * -0.289855)+95.6522 12 Horizon Sensor (V) (N * 0.01)+0 14 DCE RAMCurrent (mA) (N * 0.1493)-10.5075 15 DCE CPU Current (mA) (N * 0.5)-93.55 16 DCE Gen.Mem.Curr (mA) (N * 0.4762)-57.7619 17 +X Array Temp. (Deg C) (N * -0.2)+96.1 18 +Y Array Temp. (Deg C) (N * -0.2)+96.1 19 +Z Array Temp. (Deg C) (N * -0.2)+96.1 20 Array -X Curr. (mA) (N * -1.9)+980.4 21 +10V Current (mA) (N * 0.97)+0 22 +10V Voltage (V ) (N * 0.015)+0 23 P/W logic Curr (mA) (N * 0.14)+0 24 P/W Geiger Curr (mA) (N * 0.21)+0 25 El.Sp.+10V Curr (mA) (N * 0.096)+0 26 El.Sp.-10V Curr (mA) (N * 0.093)+0 27 -X Array Temp. (Deg C) (N * -0.2)+96.1 28 -Y Array Temp. (Deg C) (N * -0.2)+96.1 29 -Z Array Temp. (Deg C) (N * -0.2)+96.1 30 Array +X Curr. (mA) (N * -1.9)+980.4 31 -10V Current (mA) (N * 0.48)+0 32 -10V Voltage (V ) (N * -0.036)+0 33 1802 +10V Curr (mA) (N * 0.21)+0 34 Digit. +5V Curr (mA) (N * 0.13)+0 35 145MHz Power (mW) (N * 2.5)-275 36 145MHz Current (mA) (N * 0.22)+0 37 145 MHz TX Temp (Deg C) (N * -0.2)+96.1 38 Cmnd Dec Temp. (Deg C) (N * -0.2)+96.1 39 TLM system Temp. (Deg C) (N * -0.2)+96.1 40 Array Volts (30) (V) (N * 0.1)-51.6 41 +5V Current (mA) (N * 0.97)+0 42 +5V Voltage (V) (N * 0.0084)+0 43 DSR +5V Current (mA) (N * 0.21)+0 44 Command RX Curr (mA) (N * 0.92)+0 45 435MHz Power (mW) (N * 2.5)-200 46 435MHz Current (mA) (N * 0.44)+0 47 435 MHz TX Temp (Deg C) (N * -0.2)+96.1 48 P/W Temp. (Deg C) (N * -0.2)+96.1 49 BCR Temp. (Deg C) (N * -0.2)+96.1 50 Battery Current (mA) (N * 8.8)-4514.4 51 +14V Current (mA) (N * 5)+0 52 Battery Voltage (V) (N * 0.021)+0 53 Batt Cell Volt. (V) (N * 0.0053)+0 54 TLM +10V Curr (mA) (N * 0.02)+0 55 2.4MHz Power (mW) (N * 0.01)+0 56 2.4MHz Current (mA) (N * 0.45)+0 57 Battery Temp. (Deg C) (N * -0.2)+96.1 58 2.4GHz tx Temp. (Deg C) (N * -0.2)+96.1 59 CCD camera Temp. (Deg C) (N * -0.2)+96.1
Digital Status Points
Bit Meaning 1 0 --------------------------------- 00 145 MHz power On Off 01 435 MHz power On Off 02 2401 MHz power On Off 03 TLM mode select DweIl Run 04 TLM dwell load On Off 05 TLM dweIl sourc Computer Gnd 06 OBC power On Off 07 OBC error count 1 0 08 OBC error count 1 0 09 OBC bootstrap PROM UART 10 OBC error count 1 0 11 OBC bootstrap B A 12 boom pyros Arm Safe 13 boom pyros Hold Fire 14 boom deployment Arm Safe 15 boom deployment Hold Deploy 16 boom deployment Retract Extend 17 Magnetorquers Arm Safe 18 X Magnetorquer Off On 19 Y Magnetorquer Off On 20 Z Magnetorquer Off On 21 Magnetorquers Forw Rev 22 435 MHz PSK NRZIC NRZI 23 2401 MHz PSK NRZIC NRZI 24 Magnetorquers Low High 25 Digit. power On Off 26 CCD power On Off 27 CCD int. period 1 0 28 CCD int.period 1 0 29 CCD amp gain 1 0 30 CCD amp gain 1 0 31 DSR power On Off 32 DSR mode Write Read 33 DSR mode Run Reset 34 Geiger-A power On Off 35 Geiger-B power On Off 36 Geiger-C power On Off 37 Sptr EHT power On Off 38 DCE expt. power On Off 39 DCE Run Reset 40 DCE PROM select B A 41 DCE clock rate 1.8 0.9 42 NavMag power On Off 43 SpaceDust power on off 44 Status cal 1 0 45 BCR status B A 46 435 MHz mod PSK AFSK 47 2401 MHz mod PSK AFSK |
Bit Meaning 1 0 ----------------------------------------- 48 OBC serial comm Enab Disab 49 DCE serial comm Enab Disab 50 144MHz channel B A 51 438MHz channel B A 52 1269MHz channel B A 53 Watchdog Enab Disab 54 Watchdog reset Reset Run 55 145MHz data seI 1 0 56 145MHz data seI 1 0 57 145MHz data sel 1 0 58 145MHz data seI 1 0 59 145MHz data seI 1 0 60 145MHz data seI 1 0 61 145MHz data rate 1 0 62 145MHz data rate 1 0 63 435MHz data rate 1 0 64 435MHz data rate 1 0 65 435MHz data rate 1 0 66 P/W counter ctrl Reset Count 67 VHF/UHF lock prot Enab Disab 68 Status cal 1 0 69 144MHz RX data Yes No 70 438MHz RX data Yes No 71 1269MHz RX data Yes No 72 P/W plate ctrl 1 0 73 P/W plate ctrl 1 0 74 P/W plate ctrl 1 0 75 Space Dust 1 0 76 Space Dust 1 0 77 Space Dust 1 0 78 Space Dust 1 0 79 Space Dust 1 0 80 Space Dust 1 0 81 Space Dust 1 0 82 Space Dust 1 0 83 DSR write compl Yes No 84 1802 CWO output 1 0 85 OBC TLM port 1 0 86 OBC TLM port 1 0 87 OBC TLM port 1 0 88 OBC TLM port 1 0 89 OBC TLM port 1 0 90 OBC TLM port 1 0 91 OBC TLM port 1 0 92 OBC TLM port 1 0 93 OBC TLM port 1 0 94 OBC TLM port 1 0 95 OBC TLM port 1 0 |
Decoded 14 Juli 2012
UOSAT-2 1109093081413 000000010001020002030003040004050005060006070007080008090009 100001110000120003130002140005150004160007170006180009190008 20000221000322000023000124000625000726000427000528000A29000B 30000331000232000133000034000735000636000537000438000B39000A 40000441000542000643000744000045000146000247000348000C49000D 50000551000452000753000654000155000056000357000258000D59000C 60800E615FC1620004633305644402651E0C66200267000168000E69000F UOSAT-2 1109093081418 000000010001020002030003040004050005060006070007080008090009 100001110000120003130002140005150004160007170006180009190008 20000221000322000023000124000625000726000427000528000A29000B 30000331000232000133000034000735000636000537000438000B39000A 40000441000542000643000744000045000146000247000348000C49000D 50000551000452000753000654000155000056000357000258000D59000C 60800E615FC1620004633305644402651E0C66200267000168000E69000F UOSAT-2 1109093081423 000000010001020002030003040004050005060006070007080008090009 100001110000120003130002140005150004160007170006180009190008 20000221000322000023000124000625000726000427000528000A29000B 30000331000232000133000034000735000636000537000438000B39000A 40000441000542000643000744000045000146000247000348000C49000D 50000551000452000753000654000155000056000357000258000D59000C 60800E615FC1620004633305644402651E0C66200267000168000E69000F
Receive and decode UO-11 telemetry with a sound card and MixW32
MixW settings for decoding UO-11
- SoundCard: Full Duplex
- RX frequency: 1800
- Mode: RTTY 1200Bd select ASCII-7
- Mode Setting: 1200Hz baud rate and shift
Status
After a long periode of silence UO-11 turned on again on 30 July. The telemetry shows, however, that all analogue channels have failed. The status of digital channels show correct values. The On-Board Clock goes back a few days. The signal strength is much worse than before. As long as the watchdog timer operates, the beacon will be active in a 10-day rhythm. The S-band beacon is off.
Homepage and other references:
Beacon receive reports can be sent to G3CWV
OSCAR-11 information http://www.g3cwv.co.uk/oscar11.htm