PRISM

Pico-satellite for Remote-sensing and Innovative Space Missions, The University of Tokyo

Am 23.01.2009 um 03:54 UTC startete eine H-IIA F15 Rakete vom Tanegashima Space Center in Japan. Hauptnutzulast war GOSAT (Ibuki), der weltweit erste Satellit, der den Klimawandel untersuchen soll. Als Piggiback Payload waren noch 6 weitere Satelliten an Bord. Um 04:43 UTC wurde PRISM als letzter Satellit separiert.

PRISM

NASA-Catalog: 33493

Downlink

437.425 MHz, FM 1k2 AFSK (800mW), 9k6 GMSK (2W)

Bake

437.250 MHz, CW (80mW)

Call

JQ1YZW

Status

ACTIVE

Orbital Parameter

Name	                PRISM
NORAD                   #33493
COSPAR Bezeichnung      2009-002-B  
Inklination (Grad)      98.046
RAAN                    147.181
Excentrizität           0.0019427
ARGP                    313.924
Umläufe pro Tag         14.80607306
Periode                 1h 37m 15s (97.25 Min)
Semi-major axis         7006 km
Perigäum x Apogäum      614 x 641 km
Mean Anomaly            46.037


CW Telemetrie

CW ist der Standardmode von PRISM, der Packet-Downlink wird nur im Bereich der Kommandostation in Japan aktiv sein. Die CW Telemetrie besteht aus insgesamt 14 Frames. Hier die Übersicht:

PRISM CW Telemetrie Format

Frame 0

PR0 AA BB CC DD EE FF GG HH

AA   fixed value                                  
BB   CDH subsystem voltage A              4.69*N/255                 [V]
CC   mission subsystem voltage            4.69*N/255 * 1.667         [V]
DD   power subsystem voltage              4.69*N/255 * 1.667         [V]
EE   CDH subsystem voltage B              4.69*N/255 * 1.667         [V]
FF   TX subsystem voltage                 4.69*N/255 * 1.667         [V]
GG   Main RX subsystem voltage            4.69*N/255 * 1.667         [V]
HH   Sub RX subsystem voltage             4.69*N/255 * 1.667         [V]

Frame 1

PR1 AA BB CC DD EE FF GG HH

AA   fixed value                                  
BB   magnetic torquer supply voltage      4.69*N/255                 [V]
CC   AFSK radio supply voltage            4.69*N/255 * 1.667         [V]
DD   GMSK radio supply voltage            4.69*N/255 * 2.5           [V]
EE   solar cell output voltage            4.69*N/255 * 2.5           [V]
FF   Battery voltage                      4.69*N/255 * 2.5           [V]
GG   Charging current                     4.69*N/255 * 666.67        [mA]
HH   Discharging current                  4.69*N/255 * 666.67        [mA]

Frame 2

PR2 AA BB CC DD EE FF GG HH

AA   fixed value                                  
BB   solar cell output current +X         4.69*N/255 * 227.27        [mA]
CC   solar cell output current -X         4.69*N/255 * 227.27        [mA]
DD   solar cell output current +Y         4.69*N/255 * 227.27        [mA]
EE   solar cell output current -Y         4.69*N/255 * 227.27        [mA]
FF   solar cell output current +X rev     4.69*N/255 * 106.38        [mA]
GG   solar cell output current -X rev     4.69*N/255 * 106.38        [mA]
HH   solar cell output current +Y rev     4.69*N/255 * 106.38        [mA]

Frame 3

PR3 AA BB CC DD EE FF GG HH

AA   fixed value                                  
BB   solar cell output current -Y rev     4.69*N/255 * 106.38        [mA]
CC   solar cell output current +X body    4.69*N/255 * 106.38        [mA]
DD   solar cell output current -X body    4.69*N/255 * 106.38        [mA]
EE   solar cell output current +Y body    4.69*N/255 * 106.38        [mA]
FF   solar cell output current -Y body    4.69*N/255 * 106.38        [mA]
GG   CDH subsystem supply current A       4.69*N/255 * 333.33        [mA]
HH   mission subsystem supply current     4.69*N/255 * 227.27        [mA]

Frame 4

PR4 AA BB CC DD EE FF GG HH

AA   fixed value                                  
BB   power subsystem supply current       4.69*N/255 * 33.33         [mA]
CC   CDH subsystem supply current B       4.69*N/255 * 22.73         [mA]
DD   TX subsystem supply current          4.69*N/255 * 33.33         [mA]
EE   Main RX subsystem supply current     4.69*N/255 * 22.73         [mA]
FF   Sub RX subsystem supply current      4.69*N/255 * 22.73         [mA]
GG   AFSK radio supply current            4.69*N/255 * 333.33        [mA]
HH   GMSK radio supply current            4.69*N/255 * 666.67        [mA]

Frame 5

PR5 AA BB CC DD EE FF GG HH

AA   fixed value                                  
BB   sensor system supply current         4.69*N/255 * 50.0          [mA]
CC   heater supply current                4.69*N/255 * 227.27        [mA]
DD   Deployment system supply current     4.69*N/255 * 666.67        [mA]
EE   Gyroscope X                          (4.69*N/255 -2.5) / -0.025 [deg/s]
FF   Gyroscope Y                          (4.69*N/255 -2.5) / -0.025 [deg/s]
GG   Gyroscope Z                          (4.69*N/255 -2.5) / -0.025 [deg/s]
HH   not used

Frame 6

PR6 AA BB CC DD EE FF GG HH

AA   fixed value                                  
BB   Temperature +X side                  -87.5 * 4.69*N/255 + 162.5 [°C]   
CC   Temperature -X side                  -87.5 * 4.69*N/255 + 162.5 [°C]   
DD   Temperature +Y side                  -87.5 * 4.69*N/255 + 162.5 [°C]   
EE   Temperature +Y side                  -87.5 * 4.69*N/255 + 162.5 [°C]   
FF   Temperature +Z side                  -87.5 * 4.69*N/255 + 162.5 [°C]   
GG   Temperature -Z side                  -87.5 * 4.69*N/255 + 162.5 [°C]   
HH   fixed value

Frame 7

PR7 AA BB CC DD EE FF GG HH

AA   fixed value                                  
BB   Temperature +X panel                 -87.5 * 4.69*N/255 + 162.5 [°C]   
CC   Temperature -X panel                 -87.5 * 4.69*N/255 + 162.5 [°C]   
DD   Temperature +Y panel                 -87.5 * 4.69*N/255 + 162.5 [°C]   
EE   Temperature +Y panel                 -87.5 * 4.69*N/255 + 162.5 [°C]   
FF   Temperature +Z panel                 -87.5 * 4.69*N/255 + 162.5 [°C]   
GG   Temperature -Z panel                 -87.5 * 4.69*N/255 + 162.5 [°C]   
HH   fixed value

Frame 8

PR8 An Bn Cn Dn En Fn Gn Hn In Jn Kn Ln

An   power switchiung history of CDH subsystem A           Origin n times
Bn   power switching history of mission subsystem B        Origin n times
Cn   power switching history of CDH subsystem B            Origin n times
Dn   power switching history of TX subsystem               Origin n times
En   power switching history of Main RX subsystem          Origin n times
Fn   power switching history of Sub RX subsystem           Origin n times
Gn   power switching history of AFSK radio                 Origin n times
Hn   power switching history of Magnetic Torquer           Origin n times
In   power switching history of GMSK radio                 Origin n times
Jn   power switching history of Sensor system              Origin n times
Kn   power switching history of Heater system              Origin n times
Ln   power switching history of Deployment system          Origin n times

Origin:        0  none
               1  uplink command	  (number of times n = 0)
               2  over cuurent       (judge from AD conversion data)
               3  over voltage       (judge from AD conversion data)
               4  over cuurent       (by over current protection circuit)
               5  mutal monitoring
               6  regulation
               7  switching times exceeded a certain limit

Frame 9

PR8 AA BB CC DD EE FF GG HH II JJ KK LL MM NN OO PP

AA   switching status of CDH subsystem A 
BB   switching status of mission substem
CC   switching status of CDH subsystem B
DD   switching status of TX substem     
EE   switching status of Main RX subsystem
FF   switching status of Sub RX subsystem 
GG   switching status of AFSK radio      
HH   switching status of Magnetic Torquer
II   switching status of GMSK radio      
JJ   switching status of Sensor system   
KK   switching status of Heater system   
LL   switching status of Deployment system 
MM   switching status of overcurrent protection circuit of GMSK
NN   switching status of overcurrent protection circuit of CDH 
OO   switching status of Battery charge 
PP   switching status of emergency battery     

value: 3F = OFF     40 = ON

Frame 10

PRA AA BB CC DD EE

AABBCCDD   time ticks from power subsystem rebooting     counts [sec]
EE         operation mode
             53 = SAFE
             4E = NORMAL
             52 = RESET

Frame 11

PRB AA BB CC DD EE FF GG HH II

AA   last error log     pointer to error log number #, 0 = no error
BB   error log #1       see error table
CC   error log #2       see error table
DD   error log #3       see error table
EE   error log #4       see error table
FF   error log #5       see error table
GG   error log #6       see error table
HH   error log #7       see error table
II   error log #8       see error table

error table:

  01 = timeout of AD conversion
  02 = AD conversion did not finish
  10 = switching times of CDH subsystem voltage A exceeded the limit
  12 = switching times of CDH subsystem voltage B exceeded the limit
  13 = switching times of TX exceeded the limit
  14 = switching times of Main RX exceeded the limit
  15 = switching times of Sub RX exceeded the limit
  16 = switching times of AFSK radio exceeded the limit
  19 = switching times of Sensor system exceeded the limit
  1E = Charging current (or voltage) error
  1F = Battery voltage error
  20 = CAN Error -> data overrun error
  21 = CAN Error -> error counter over or bus status change
  30 = CAN Error -> received invalid message
  31 = received invalid command
  40 = no reply
  41 = rely invalid
  42 = operation competing of some commands
  50 = serial communication error (Main RX)
  51 = serial communication error (Debug)

Frame 12

PRC //WWW.SPACE.T.U-TOKYO.AC.JP

Frame 13

PRD {message from ISSL members}

Status

CW Bake aktiv

Erste empfangene Telemetrie

23.01.2009, 1027 UTC (2 degr pass)
prc --www.space.t.u-tokyo.ac.jp
prd -soranokonosorawoomougagotoki
pr0 .....4a5a421a4a4
pr1 0000a51dfbb91000
pr2 000410110d00000.

23.01.2009, 1341 UTC
pr2 00 01 10 0d 0c 00 00 00
pr3 00 08 00 00 00 8b 00 02
pr4 00 37 6d 00 30 2a 05 00
pr5 00 5c 00 00 87 87 8b 75
pr6 00 5e 5e 65 56 61 67 00
pr7 00 72 74 73 6e 63 62 00
pr8 00 00 00 00 00 00 00 00 00 00 00 00
pr9 3f 3f 40 3f 40 40 .. ..

23.01.2009, 1510 UTC
pr5 00 59 00 00 89 8b 8c 75
pr6 00 5e 68 5a 64 65 69 00
pr7 01 7d 78 77 7e 63 63 00
pr8 00 00 00 00 00 00 00 00 00 00 00 00

Software zum Dekodieren der CW-Telemetrie

PRISM Software

PRISM sendet CW Telemetrie in 14 unterschiedlichen Frames. Der empfangene String (beginnend jeweils mit dem Frametyp PRx) wird in das entsprechende Textfeld eingegeben. Alle Telemetriedaten werden berechnet und übersichtlich angezeigt. Auch das Einlesen eines ASCII Files mit den entsprechenden Daten ist möglich. Die ausgewertete Telemetrie kann in einem ASCII File abgespeichert werden.

Download Download Version 1.0 [27.01.2009]

Links und weitere Informationen

http://www.space.t.u-tokyo.ac.jp/prism/main-e.html
http://www.jaxa.jp/countdown/f15/overview/sub_payload_e.html



Launch

Piggiback Payloads (c) JAXA

all Payloads (c) JAXA