KHU Ground Station Nayoung Yoon TRIOCINEMA 1 KHU

KHU Ground Station Nayoung Yoon TRIO-CINEMA 1 KHU, 2010/10/04

Agenda 1. KHU Ground Station (Introduction) 1) 2) 3) 4) 5) 6) 2. Ground Station context diagram Integrated Ground Support Software(IGSS) UHF RF Chain Ground system configuration Ground Station computer configuration Ground Station Equipment Antenna Setting 1) KHU UHF Antenna 2) UHF Antenna Pattern 3) Antenna Test 3. RF Equipment Test v Transceiver - Helium 100 v TNC TRIO-CINEMA 2 KHU, 2010/10/04

KHU Ground Station TRIO-CINEMA 3 KHU, 2010/10/04

Ground Station Context Diagram TRIO-CINEMA 4 KHU, 2010/10/04

Integrated Ground Support Software (IGSS) TRIO-CINEMA 5 KHU, 2010/10/04

UHF RF Chain TRIO-CINEMA 6 KHU, 2010/10/04

UHF Ground system configuration TRIO-CINEMA 7 KHU, 2010/10/04

Ground Station computer Configuration TRIO-CINEMA 8 KHU, 2010/10/04

Ground Station Equipment Rotator Tracking Subsystem Rotator Controller Satellite Tracker S/W (HRD) Antenna RF Uplink Subsystem TNC Transceiver GSEOS Telemetry & Commanding Subsystem RS Decoder Mission Planning Subsystem MPS Attitude Control Subsystem Attitude Simulator Pc Ground Computer Monitor UPS TRIO-CINEMA 9 KHU, 2010/10/04

Ham Radio Deluxe – subprogram TRIO-CINEMA 10 KHU, 2010/10/04

Antenna Setting TRIO-CINEMA 11 KHU, 2010/10/04

KHU UHF Antenna TRIO-CINEMA Antenna gain 9. 8 d. Bi @ 435 MHz Azimuth range 450 ˚ Elevation range 180 ˚ Antenna connector N Rotator torque Elevation: 14 kg-m (101 ft-lbs) Azimuth: 6 kg-m (44 ft-lbs) Rotator controller RS-232 C voltage levels. 1200 to 9600 baud, 8 data bits, 1 stop bit, no parity, Hardware control(CTS port) Antenna Polarization LHCP Rotator Azimuth velocity 58 sec @ 60 Hz Rotator Elevation velocity 67 sec @ 60 Hz Operating temperature -40 to +70 ℃ 12 KHU, 2010/10/04

Elevation Calculate between Astronomical observatory Dorm and Antenna TRIO-CINEMA 13 KHU, 2010/10/04

Elevation Calculate between Astronomical observatory Dorm and Antenna u Condition v 650 km, Sun-synchronous, Launched 2012 -07 -01, Ascending node 00: 00 v Calculated by STK Global Statistics • • Min Duration 1415 53: 55. 3 54: 11. 5 16. 234 sec 　 Max Duration 791 50: 37. 2 01: 37. 2 659. 973 sec 　 Mean Duration 　 　 　 518. 578 sec 8. 642967 min Total Duration 　 　 　 761273. 013 sec 12687. 88 min The number of Total Contact times : 19226 The number of out of contact times : 1758 -> 9. 14% Mean Contact time(min) : 8 Mean out of contact time(min) : 1 min 20 sec TRIO-CINEMA 14 KHU, 2010/10/04

Set UHF Antenna TRIO-CINEMA 15 KHU, 2010/10/04

Test Interface TRIO-CINEMA 16 KHU, 2010/10/04

UHF Antenna Pattern TRIO-CINEMA 17 KHU, 2010/10/04

Antenna Test 1 – Rotator operating time 1. In manual Max operation time is 5 min 2. What does it mean exactly? v Just operate 5 min v When rotator has Max torque -> 5 min 3. Test Method v Tracking continuously 3 Amateur satellite v Rotator had about 1 min interval v Total rotator operation time : 30 min 4. Test Result § It works very well. Nothing happened. § But KHU has a spare rotator. TRIO-CINEMA 18 KHU, 2010/10/04

Antenna Test 2 – Direction Rotator moves North 0°, increments to 30°I n a clockwise direction § Check the direction when it comes Counterclockwise from the recirculated back § Hang the thread at the end of the Antenna for checking antenna’s exactly direction § TRIO-CINEMA 19 KHU, 2010/10/04

Antenna Test 2 - Result Direction North East South West HRD 0° 30° 60° 90° 120° 150° 180° 210° 240° Rotator 9. 5 N 19. 5 E N 49. 5 E N 86 E X E 147 S E 179 S S 206 W X North East Direction West HRD 270° 300° 330° 360° 400° 430° 450° S 269 W W 300 N W 330 N 0 N 20 E N 50 E N 75 E Rotator North West 1) 0 ° - 60 ° 2) Can’t because Observotary is round shape 3) Rotator should be TRIO-CINEMA 20 KHU, 2010/10/04

Antenna test 3 – RF Chain 1. Test Chain v Handy Transceiver – UHF Antenna – TS 2000 Transceiver 2. Distance v About 900 m v KHU Astronomical Observatory - KHU Front gate 3. Result v Both transceiver work well 4. Future plan v Connect Helium 100 with handy transceiver for far-field test TRIO-CINEMA 21 KHU, 2010/10/04

Communication Test 1. Test Chain v Helium 100 – Computer – TNC – Transceiver 2. Result (Berkeley) v TNC built in Transceiver v Using GSEOS or the other terminal program – receive data 3. Result (KHU) v TNC transmit data v Transceiver(TS-2000) transmit and receive well v Connect TNC and transceiver : can’t receive data v Problem : connect cable or setting problem with transceiver -> check problem when I come back to KOREA TRIO-CINEMA 22 KHU, 2010/10/04

Future plan 1. TNC – Transceiver – Helium 100 test 2. TNC – Transceiver – UHF Antenna – Handy transceiver – Helium 100 test TRIO-CINEMA 23 KHU, 2010/10/04

THANK YOU TRIO-CINEMA 24 KHU, 2010/10/04