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

Originally 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 1;: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

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