CO-58

CubeSat OSCAR CO-58 (XI-V / SAI FIVE)

XI-V Sai FiveOriginally XI-V is a backup model of XI-IV, and there has been no plan to launch it. However XI-IV was so successful, and a propose has come to verify the new type of solar cells with XI-V. Launch of XI-V was determined on very short notice. Receiving this chance, we improved the on-board software, and the images taken by XI-V will become more vivid and beautiful. Though XI-V is a kid brother of XI-IV, it can be said that he is a souped-up young. XI-V was launched on October 27, 2005, from Plesetsk Cosmodrome, Russia. The launching vehicle was “KOSMOS” rocket. XI-V was released from ESA’s educational satellite SSETI-Express. SSETI-Express itself is a piggy-back satellite, which means that XI-V is a grandchild satellite. The specification of XI-V communication system is almost the same as XI-IV. Note that the call sign and frequencies of XI-V are different.

Orbital parameters

Name                 XI-V
NORAD                28895
COSPAR designation   2005-043-F
Inclination (degree) 98.187
RAAN                 199.415
Eccentricity         0.0018310
ARGP                 165.839
Orbit per day        14.59301973
Period               1h 38m 40s (98.67 Min)
Semi-major axis      7074 km
Perigee x apogee     682 x 708 km

Downlink

437,345 MHz FM FSK AX.25, 1k2, 800mW, Half wave dipole
437,465 MHz CW 50wpm, 80 mW, Half wave dipole

Call

JQ1YGW

Status

active

Telemetry

Status Frames

XIC01 a b  V  c d  I  e f  S  g h i j k l  T  m n o p q r s t u v w x y
Status and flags of XI-V including voltage, current, temperature etc.

a : number of command reception (1byte)
b : OBC time (6bytes)

c : voltage of secondary batteries (2bytes)
d : voltage of solar array (2bytes)

e : charging current (2bytes)
f : consumption current of CDC (2bytes)

g : Solar array current of +X Panel (2bytes)
h : Solar array current of -X Panel (2bytes)
i : Solar array current of +Y Panel (2bytes)
j : Solar array current of -Y Panel (2bytes)
k : Solar array current of +Z Panel (2bytes)
l : Solar array current of -Z Panel (2bytes)

m : Solar array Temperature of +X Panel (2bytes)
n : Solar array Temperature of -X Panel (2bytes)
o : Solar array Temperature of +Y Panel (2bytes)
p : Solar array Temperature of -Y Panel (2bytes)
q : Solar array Temperature of +Z Panel (2bytes)
r : Solar array Temperature of -Z Panel (2bytes)
s : Temperature of secondary batteries (2bytes)

t : Temperature of FM transmitter (2bytes)
u : status flags
  (0:LSB -- 7:MSB)
  0:telemetry mode (0:detail&nbsp1;:rough)
  1-7:overwrite of camera ROM (0:enable 1:disable)
v : status flags
  (0:LSB -- 7:MSB)
  0-4:uplink counter
  5-7:camera counter
w : status flags
  (0:LSB -- 7:MSB)
  0-2:SEL reset counter
  3:antenna deployment (0:NO 1:YES)
  4-5:CW mode (0:Duty0 1:less than default 2:default 3:more than default)
  6:cause of reset (0:normal 1:WDT)
  7:charge flag (0:charging 1:disable)
x : work in progress flags
  (0:LSB -- 7:MSB)
  0:Tx command
  1:CW
  2:Not Used(0)
  3:camera
  4:antenna
  5:Not Used(0)
  6:serial communication to other equipment
y : operating conditions of camera (0:OFF 1:ON)
Transformation fomula   

Transformation formula from data to voltage, current and temperature as follows:

c :voltage of secondary batteries
A data is given in hexadecimal. Please change a hexadecimal number to a decimal number,
and substitute the data into following equation.
voltage=data/255*4.5 [V]

<Example>
voltage=0x0f=15
voltage=15/255*4.5=0.26 [V]

d :voltage of solar array
A data is given in hexadecimal. Please change a hexadecimal number to a decimal number,
and substitute the data into following equation.
voltage=data/255*4.5*74.9/18.7 [V]

<Example>
voltage=0xa0=160
voltage=160/255*4.5*74.9/18.7=11.3 [V]

e :charging current
A data is given in hexadecimal. Please change a hexadecimal number to a decimal number,
and substitute the data into following equation.
voltage=data/255*4.5/100 [mA]

f :consumption current of CDC
A data is given in hexadecimal. Please change a hexadecimal number to a decimal number,
and substitute the data into following equation.
voltage=data/255*4.5*392 [mA]

g-l :Solar array current
A data is given in hexadecimal. Please change a hexadecimal number to a decimal number,
and substitute the data into following equation.
 +X Panel=data*2.3957+2.7037 [mA]
 -X Panel=data*2.3823+2.3217 [mA]
 +Y Panel=data*2.4234+1.6915 [mA]
 -Y Panel=data*2.3724+3.2306 [mA]
 +Z Panel=data*2.3840+2.1696 [mA]
 -Z Panel=data*2.4341+4.7714 [mA]

m-r :Solar array Temperature
A data is given in hexadecimal. Please change a hexadecimal number to a decimal number,
and substitute the data into following equation.
 +X Panel=data*0.5896+65.614 [deg]
 -X Panel=data*0.5916+66.133 [deg]
 +Y Panel=data*0.5862+65.813 [deg]
 -Y Panel=data*0.5846+66.280 [deg
 +Z Panel=data*0.5880+64.903 [deg]
 -Z Panel=data*0.5932+66.483 [deg]

s :Temperature of secondary batteries
A data is given in hexadecimal. Please change a hexadecimal number to a decimal number,
and substitute the data into following equation.
 Temperature=data*0.5948-67.203 [deg]

t :Temperature of FM transmitter
A data is given in hexadecimal. Please change a hexadecimal number to a decimal number,
and substitute the data into following equation.
Temperature=data*0.5811-67.055 [deg]

CW Beacon format

 Transmit Data Format
Binary data is given in hexadecimal. CW transmitter sends high-order bits and low-order
bit in twice.
For example,a=0xc0 is separated into "c" and "0" and sent respectively.

XIV1 [AA] [BB] [CC]
OBC (On-Board Computer) Time. XI-V counts time with 3 bytes. 1 count of OBC time nearly
equals 1 second. Maximum value is 0xFFFFFF, which means approximately 191 days.

XIV2 [DD] [EE] [FF] [GG]
[DD] [EE]: Status and flags including uplink counter, camera overwrite status, and charge
status, etc.
[FF]: Status and flags including OBC survival flag, data sending status, etc.
[GG]: AD conversion value of RSSI (Received Signal Strength Indicator). This is the maximum
value of RSSI while XI-V is sending XIV1 to XIV2.

XIV3 [HH] [II] [JJ]
Temperature and voltage received from communication subsystem. It may be different from the
data of XIV6 because of the accuracy.
[HH]: AD conversion value of the voltage of secondary batteries.
[II]: AD conversion value of the voltage of solar array.
[JJ]: AD conversion value of the temperature of secondary batteries.

XIV4 [KK][LL][MM][NN][OO][PP]
Solar array current measurement data received from OBC.
[KK]: Current of +X Panel, [LL]: Current of -X Panel, [MM]: Current of +Y Panel,
[NN]: Current of -Y Panel, [OO]: Current of +Z Panel, [PP]: Current of -Z Panel

XIV5 [QQ][RR][SS][TT][UU][VV]
Temperature data received from OBC.
[QQ]: Temperature of +X Panel, [RR]: Temperature of -X Panel, [SS]: Temperature of +Y Panel,
[TT]: Temperature of -Y Panel, [UU]: Temperature of +Z Panel, [VV]: Temperature of -Z Panel

XIV6 [WW][XX][YY][ZZ][GG]
Temperature and voltage received from OBC.
[WW]: Temperature of FM transmitter
[XX]: voltage of secondary batteries
[YY]: voltage of solar array
[ZZ]: Temperature of secondary batteries
[GG]: the maximum value of RSSI while XI-V is sending XIV3 to XIV6.

XIV7 XXXXX XXXXX XXXXX XXXXX XXXXX
the message from OBC

Homepage and other references:

http://www.space.t.u-tokyo.ac.jp/nlab/index_e.html