Ver.1 29/5/2009 1
UNISEC (UNIversity Space Engineering Consortium) UNITEC-1 (UNIsec Technological Experiment Carrier-1) 2010 5 UNITEC-1 GHz C CW UNISEC AMSAT UNITEC-1 TBD CW UNITEC-1, 2
1. UNITEC-1 UNISEC (University Space Engineering Consortium) 1) UNITEC-1 (UNIsec Technology Experiment Carrier-1 15 kg, 35cm ) OBC JAXA 2010 H-IIA Planet-C X Y Z Fig. 1 UNITEC-1 UNITEC-1 UNISEC OBC OBC OBC OBC UNITEC-1 3
UNITEC-1 2008 8 2009 1 PDR (2009 5 ) EM OBC(UOBC ) 2009 8 2009 5 6 2010 12 UNITEC-1 2. UNITEC-1 UNITEC-1 (1) 2008 8 2010 1 4
(2) (3) 1000 (4) (5) (2) (1)(3)(4) UNITEC-1 CW 1200-9600bps FM FSK C (5.8GHz) 6300 km UNITEC-1 CW S/N UNITEC-1 MOBC MCM RS-422 5
3. 3.1 UOBC Minor Minor UOBC ( Downlink Format Type 1 ), ( Downlink Format Type 2 ). Format 1 2 4.2 Time (s) Frame Operation Duration (s) Required Power (W) 0 Minor 1 Waiting 3240 12.2 3240 (2 hours) Camera capturing star images 360 13.7 3600 UOBC experiment (6 UOBC tests, 1800 15.2 each taking 5 minutes) 5400 RF Downlink Type 1 1800 48.8 7200 Minor 2 Waiting 3600 12.2 10800 (2 hours) UOBC experiment (6 UOBC tests, 1800 15.2 each taking 5 minutes) 12600 RF Downlink Type 2 1800 48.8 14400 Minor 3 Waiting 3600 12.2 18000 (2 hours) UOBC experiment (6 UOBC tests, 1800 15.2 each taking 5 minutes) 19800 RF Downlink Type 2 1800 48.8 22.1 W 19.7 W 3.2 UOBC (UOBC ) (MOBC ) UOBC 6
UOBC 1 MOBC UOBC UOBC MOBC, UOBC 1) UOBC MOBC UOBC MOBC. 2) MOBC CRC UOBC CRC UOBC 3) UOBC ACK MOBC 4) UOBC, UOBC MOBC MOBC UOBC UOBC 4. 4.1 2 CW MOBC CW 7
CW ON ( ) OFF ( ) 3.1 CW 2 UNITEC-1 Transmitter RF Transmit Power 9.6 W Frequency 5.84 GHz (band width 20MHz) Type 10M0F2D Modulation 1200bps FSK / 1bps CW Input Voltage +12V DC Power Consumption Max 61.1 W Weight 700g Size 230 mm 136 mm 30 mm Receiver Frequency 145 MHz band (width 200kHz) Type 30K0F2D Input Voltage 5 V Power Consumption 0.125 W Weight 200g Size 70 mm 60 mm 30 mm 3 RF 8
4.2 3 UNITEC-1 3,600,000 km 1bps 3 3,600,000 km 9
4.3 5 2.6 5.0 degree/s. Communication zone Earth Start receiving End Receiving Communication zone UNITEC-1 UNITEC-1 0 ( ) CW 1) (60 60 ) 101010101010101010101010101010101010101010 ---------- 101010101011111111 2) (69 69 ) 111111111 0011111111 00011111111 <1> 000011111111 0000011111111 <2> 00000011111111 MOBC 10
MOBC MOBC 0.5 Type 1: 1) 2) 3) UOBC 4) FM (FSK) 5) Type 2: 1) 2) 3) Type 1 FSK UNITEC-1 5 km 11
5. 5.1 UNITEC-1 UNITEC-1 6 UNITEC-1 100 EKF UNITEC-1 Measurement: Incoming RF direction/doppler Shift State variables to be estimated: UNITEC-1 position (x, y, z) and velocty (Vx,Vy,Vz)in Sun-centered coordinate Ecliptic Reference direction as Plane the Vernal Equinox World Wide Ground Station Prediction of incoming RF Direction and Doppler Shift is required for the next operation timing UNITEC-1 12
khz 10 207 100 Hz 100 /s 10 10m/s Planet-C ( ) 13
( ) (1) (2) (3) 10-20 100Hz 500Hz (4) 14
5.2 1 UNITEC-1 UNITEC-1 C GH GENSO (Ground-station Educational Network for Satellite Operation) : 1) UNITEC-1 2) 3) 4) 5) AMSAT 5.3 UNITEC-1 AMSAT 15
UNITEC-1 6. UNITEC-1 UNISEC UOBC UOBC 13 8 C&DH UOBC UNITEC-1... 7. UNITEC-1 AMSAT 1) Nakasuka, S.,: Students' Challenges towards New Frontier -Enlarging Activities of UNISEC and Japanese Universities, Keynote Speech, 26th ISTS, ISTS-2008-Key-01v, Hamamatsu, 2008 16