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TUCoPS :: Radio :: p3c_tele.txt

AMSAT Oscar-13 Telemetry Logical Channels





Posted: Mon  Sep 12, 1988   8:58 PM GMT              Msg: LGII-3733-1456
From:   AMSATDL
To:     DOCS
Subj:   P3C TELEMETRY SYSPAGE 


          A M S A T   O S C A R - 1 3     T E L E M E T R Y

                     logical telemetry channels

                            S Y S P A G E


                          Compiled by DB2OS
                            for AMSAT-DL
                         1st September 1988



This document describes the decoding of the 128 logical telemetry 
channels of the AMSAT Phase 3C satellite, OSCAR-13.




Bytes are counted in the followings ways:

     C  - unsigned count (0 to +255)
     Cs - signed count (-128 to +127, 2s complement)
     Cx - signed count (+63 to -192, #3F=+63, #FF=-1, #80=-128,
                        #7F=-129, #40=-192, modified 2s complement)



All temperature channels are decoded identically using the following
decoding relationship:

     Temp:  T = (C-120)/1.71  Celsius



Current channels are linear, but have different calibrations for
1A, 2.5A and 5A max. current:

       1A:  I = (C-15)*4.854 mA
     2.5A:  I = (C-15)*12.135mA
       5A:  I = (C-15)*24.27 mA





Here the Channel identification and decoding equations:
-------------------------------------------------------




Byte Channel        Calibration      Remarks
--------------------------------------------------------------------
00   Uin-BCR        U=(C-10)*167mV   U-Panel: +0.6V @ 0.35A
                                              +0.7V @ 1A
01   Tx-PWRout-L    Average power=(261-C)^2 / 724 Watts
                                     rectified envelope voltage.
02   T-Rx-U         Temp             Mode-B reveiver temperature.
03   ---
04   Uout-BCR       U=(C-10)*79.5mV  BCR output voltage.
05   ---
06   T-TX-U         Temp             Mode-B transmitter temperature.
07   I-14V-ST       5A               Transponder separation bus.
08   U-10V-C        U=(C-10)*53.2mV  Computer supply
09   Press He-Hi    off              Helium tank pressure.
0A   T-IHU          Temp             Integrated Housekeeping Unit
0B   I-14V-S        1A               Separation bus, 14V that supplies
                                     torquer and LIU.
0C   BCR-Oscill1    >~6=OK           BCR status. No count = not
                                     working. Typically C=80.
0D   Press He-Lo    off              Helium regulator output.
0E   T-BCR          Temp             Battery Charge Regulator.
0F   I-10V-C        1A               10V continuous power supply.
10   BCR-Oscill2    As channel 0C
11   Press Tank     off              N2O4 tank pressure.
12   T-SEU          Temp             Sensor Electronics Unit
13   IbatCharge     2.5A             Positive Current to battery.
14   L-Sensor (A)   U=(C-10)*8.53mV  Light-Sensor Antenna Side.
15   Motor Valve    off
16   T-ABAT1        Temp             Auxiliary battery 1
17   I-BCR-OUT      5A               14V line to battery and other
                                     consumers.
18   L-Sensor (M)   U=(C-10)*8.53mV  Light-Sensor Motor Side.
19   ---
1A   T-ABAT2        Temp             Auxiliary battery 2
1B   I-BCR-IN       Equivalent to total current of all panels,
                    not available due to sensor failure.
1C   Spin rate      C>131,  Spin rate=479/(C-109)-2 rpm
                    C<=131, Spin rate=(131-C)*0.85+20 rpm
                                     Sensor angular position 
                                     oscillator. Lock indication
                                     channel #47.
1D   Rx-L-AGC       Gain reduction=(C-75)^2 / 1125 dB
1E   T-MBAT         Temp             Mean battery (normally in use)
1F   I-Panel6       1A               Solar panel 6
20   Tx-PWRout-U    Average power=(287-C)^2 / 1796 Watts
                                     As channel 01.
21   T-He-Tank      Temp
22   T-Panel1       Temp
23   I-Panel5       1A
24   Rx-U-AGC       Gain reduction=(C-71)^2 / 2465 dB
25   T-Tx-L         Temp             Mode-JL transmitter.
26   T-Panel3       Temp
27   I-Panel4       1A
28   ---
29   T-Rx-L         Temp             Mode-L receiver.
2A   T-Panel5       Temp
2B   I-Panel3       1A
2C   U-14V-ST       U=(C-10)*66.8mV  Transponder separation bus.
2D   T-RUDAK        Temp             RUDAK temperature.
2E   T-top          Temp             Arm 1, Antenna side.
2F   I-Panel2       1A
30   U-9V-U         U=(C-10)*54mV    Internal 9 volt bus from
                                     Mode-B transponder.
31   T-wall-arm2    Temp
32   T-bottom       Temp             Arm 1, Motor side.
33   I-Panel1       1A
34   ---
35   T-wall-arm1    Temp
36   T-N2O4         Temp
37   ---
38   U-ABAT         U=(C-10)*78.5mV  Auxiliary battery.
39   T-S-xpnder     Temp             Mode-S transponder.
3A   T-L-Sensor     Temp             Light sensor antenna side.
3B   ---
3C   U-9V-L         U=(C-10)*45.4mV  As channel 30, Mode-L
3D   T-AZ50-Tank    Temp
3E   T-nutation damper  Temp         Arm 3.
3F   ---
40   ES-Sensitivity 2MUX0            Earth Sensor sensitivity
                                     threshold.
                    bit   significance
                    0 LSB  20mV
                    1      37mV      Hysteresis 200mV
                    2      75mV      Threshold  600mV
                    3     150mV
                    4     300mV
                    5     600mV
                    6     1.2V
                    7 MSB 2.4V       

41   Antenna/SERI   2MUX1            Antenna relays and SERI resistors.
                    bit   significance
                    0 LSB Hi-gain  2m  to U
                    1     Hi-gain 70cm to L
                    2     --+ SERI-1  load resistor for
                    3     -+! SERI-2  both Light-Sensors
                           !! resistance
                           00  7.5 Ohm
                           01  3.9 Ohm
                           10  2.3 Ohm
                           11  5.9 Ohm

42   RUDAK-Status   2MUX2            IN-B (ex Motor-PWR).
                    C=82, Standard-ROS  (S)
                    C=78, Emergency-ROS (N, Not-ROS)
                    C=80, Primitive-ROS (P)

43   S&RUDAK-CNTL   2MUX3            Mode-S and RUDAK interface.
                    bit   significance
                    0 LSB RUDAK OFF
                    1       "   NMI/
                    2       "   Byte Clock
                    3       "   Byte count reset
                    4      ---                          
                    5     Mode-S Beacon ON 
                    6       "    Squelch defeated   
                    7 MSB   "    Squelch Hi Sensitivity 

44   BCR-Sin        2MUX4            Array voltage offset.
                    U=29.1+(Cs*100)mV  (16.3V...41.8V)

45   BCR-Sout       2MUX5            Battery knee voltage offset.
                    U=14.98+(Cx*20)mV  (11.14...16.2V = 192...63)

46   BCR-relays     2MUX6   
                    bit   significance
                    0 LSB BCR-2 ON
                    1     Auxiliary battery charging
                    2     Auxiliary battery connected,
                          Main battery disconnected.

47   SS-1           C=255 or C=0, PLL locked
                                     Sun-Sensor angular position
                                     oscillator, Slit antenna side.
48   SS-2           Time offset from SS-1
49   Flag-SS        C=1, SS-1        Sun sensor data.
                    C=2, SS-2
4A   SPIN-RAW                        Raw spin count (1/256).
4B   Sensor-control bit   significance  (OUT4)
                    0 LSB --+ MUX-CTRL for sensor elec. module
                    1     -+!
                           !!
                           00 - Sun data
                           01 - spin ref./spin counter
                           10 - ES lower beam
                           11 - ES upper beam
                    2     Earth sensor positive edge select. 
                          (Strobes value of spin count at transition.)
                    3     Motor Instrumentation ON.
                          (Pressure sensors, motore valve indicator.)
                    4     0.3V Sun Sensor Sensitivity
                    5     0.6V  "    "         "
                    6     1.2V  "    "         "
                    7 MSB 2.4V  "    "         "
                          (Max threshold #F = 1 solar constant)
4C   SS-correction
4D   Last ES-A      Z                last ES-pulse Antenna side.
4E     "            O#               (Orbit number and MA value)
4F   Last ES-M      Z                last ES-pulse Motor side.
50     "            O#               (Orbit number and MA value)
51   Lockoutrange   Within +- C counts from sun sensor pip, earth
                    sensor handler ignores data (Spin count 1 circle=
                    256 counts.)
52   ES-A           Strobed spin count at edge selected,
                                     Antenna Side beam.
53   Update Flag1   Indicates update,Antenna Side beam.
54   ES-M           As channel 52    Motor Side beam.
55   Update Flag2   As channel 53      "    "    "
56   S/C STATUS     bit   significance
                    0 LSB LIU power ON
                    1     S/A plug status 0=Safe, 1=Arm
                    2     RUDAK-out (lock)
                    3     Mode-S Squelch open
                    4     ---
                    5     Memory Softerror Counter
                    6       "         "      "
                    7 MSB   "         "      "
57   ---
58   ---
59   ---
5A   ---
5B   N              no of 20ms per dot, morse speed.
5C   n              running count of units for morse.
5D   ---
5E   TRANSPONDER    bit   significance  (OUT7)
                    0 LSB GB OFF
                    1     GB FSK (1=+170Hz)
                    2     DPSK OFF
                    3     EB ON
                    4     --+ PSK source
                    5     -+! for GB (EB: don't care)
                           !! 
                           00 - no PSK
                           01 - ranging
                           10 - EB source
                    6     Low power transponder ON
                    7 MSB Passband OFF (Beacons and Mode-J +3dB)
5F   ---
60   MODUS          bit   significance  (magnet control)
                    0     magnet system ON
                    1     undespun magnet
61   M-Soll         magnet vector desired angle to the despun sun
                    (clockwise as seen from top, 1 circle = 256)
62   M-Out          bit   significance  (OUT3, also L,S,J control)
                    0 LSB polarity Arm 1
                    1     polarity Arm 2
                    2     polarity Arm 3
                    3     Magnet power ON
                    4     Mode-J ON
                    5     ---
                    6     Mode-S ON
                    7 MSB Mode-L ON
63   O-FRAC-lo      Fractional Z increment in 20ms
64   O-FRAC-hi                       Counts down to 0 from preset
                                     value. 255th Z has different
                                     value of O-FRAC. ~7000 counts/Z.
65   O/256          Z from perigee
66   O#-lo          Orbit number
67   O#-hi
68   UHR            10ms             UTC
69                  sec
6A                  min
6B                  hour
6C                  day              1st January 1978 = AMSAT day 0.
6D                  256day
6E   SU0            10ms             IPS stopwatch 0.
6F                  sec   
70                  min
71                  min*256
72   SU1            10ms             IPS stopwatch 1.
73                  sec
74                  min
75                  min*256
76   SU2            10ms             IPS stopwatch 2.
77                  sec
78                  min
79                  min*256
7A   SU3            10ms             IPS stopwatch 3.
7B                  sec
7C                  min
7D                  min*256
7E   Event-Lo                        Used as event ID word in
7F   Event-Hi                        intermediate buffer.

END
                                                                               


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