UO-11

UO-11 (UoSAT OSCAR)

UO-11 UoSAT-2In 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

Building UoSAT-2Receive 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