CubeSat OSCAR CO-57 (XI-IV / SAI FOUR)
Development started in 2000, and the flight model was completed in 2002. This XI-IV is the first handmade nano-satellite developed by ISSL. XI-IV is the world smallest satellite as of the launch date, which satisfies the CubeSat regulation of “10cm cube and 1kg”. In addition, XI-IV is just 100th satellite put into orbit by Japan.
XI-IV was launched on June 30, 2003, from Plesetsk Cosmodrome, Russia. The launching vehicle is named “ROCKOT”, converted from the ballistic missile. This time we made a contract directly with Eurockot, which is the joint venture of Germany and Russia. XI-IV is an amateur satellite using amateur band. The following information would be required to receive data from XI-IV.
Orbital parameters
Name XI-IV NORAD 27848 COSPAR designation 2003-031-J Inclination (degree) 98.719 RAAN 197.951 Eccentricity 0.0009756 ARGP 340.615 Orbit per day 14.20194952 Period 1h 41m 23s (101.38 Min) Semi-major axis 7203 km Perigee x apogee 818 x 832 km Drag factor 0.000060584 1/ER Mean Anomaly 19.463
Downlink
437,490 MHz FM AFSK AX.25, 1k2, 800mW, Half wave dipole
436,8475 MHz CW 50wpm, 100mW. Half wave dipole
Call
JQ1YCW
Status
Aktive, Telemetry AX25 downlink will be performed only when XI-IV is passing above Japan.
Telemetry
CW Beacon Format
[UT1 WWW.SPACE.T.U-TOKYO.AC.JP URL of ISSL.
[UT2 AA BB CC] Time information.
[UT3 DD EE FF GG]
DD, EE:Status information.
FF[0]: OBC's state.(0:alive,1:dead)
FF[1]: Tx-TNC's state.(0:waiting, 1:sending)
FF[2]~[7]: (undefined)
GG: Max. of RSSI.
[UT4 HH II JJ]
HH: BATT V.
II: Solar REF.
JJ: Tmp BATT.
[UT5 KL MN OP]
Upper bits of Solar I - each data(4bit)*6=3byte.
[UT6 QR ST UV WX GG]
Q~X is Upper bits(4big) of each data.
Q~V: Temperature of each panel.
W : Temperature of battery.
X : Temperature of FM tramsmitter.
GG : Max. of RSSI.
Listen to an example
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