1. KHU Ground Station Nayoung Yoon KHU, 2010/10/041TRIO-CINEMA

2. Agenda 1.KHU Ground Station (Introduction) 1)Ground Station context diagram 2)Integrated Ground Support Software(IGSS) 3)UHF RF Chain 4)Ground system configuration 5)Ground Station computer configuration 6)Ground Station Equipment 2.Antenna Setting 1)KHU UHF Antenna 2)UHF Antenna Pattern 3)Antenna Test 3.RF Equipment Test  Transceiver  Transceiver - Helium 100  TNC KHU, 2010/10/04TRIO-CINEMA2

3. KHU Ground Station KHU, 2010/10/04TRIO-CINEMA3

4. Ground Station Context Diagram KHU, 2010/10/04TRIO-CINEMA4

5. Integrated Ground Support Software (IGSS) KHU, 2010/10/04TRIO-CINEMA5

6. UHF RF Chain KHU, 2010/10/04TRIO-CINEMA6

7. UHF Ground system configuration KHU, 2010/10/04TRIO-CINEMA7

8. Ground Station computer Configuration KHU, 2010/10/04TRIO-CINEMA8

9. Ground Station Equipment KHU, 2010/10/04TRIO-CINEMA9 Tracking Subsystem Rotator Rotator Controller Satellite Tracker S/W (HRD) RF Uplink Subsystem Antenna TNC Transceiver Telemetry & Commanding Subsystem GSEOS RS Decoder Mission Planning Subsystem MPS Attitude Control Subsystem Attitude Simulator Ground Computer Pc Monitor UPS

10. Ham Radio Deluxe – subprogram KHU, 2010/10/04TRIO-CINEMA10

11. Antenna Setting KHU, 2010/10/04TRIO-CINEMA11

12. KHU UHF Antenna KHU, 2010/10/04TRIO-CINEMA12 Antenna gain9.8dBi @ 435 MHz Azimuth range450 ˚ Elevation range180 ˚ Antenna connectorN Rotator torque Elevation: 14 kg-m (101 ft-lbs) Azimuth: 6 kg-m (44 ft-lbs) Rotator controller RS-232C voltage levels. 1200 to 9600 baud, 8 data bits,1 st op bit, no parity, Hardware control( CTS port) Antenna PolarizationLHCP Rotator Azimuth velocity58 sec @ 60 Hz Rotator Elevation velocity67 sec @ 60 Hz Operating temperature -40 to +70 ℃

13. Elevation Calculate between Astronomical observatory Dorm and Antenna KHU, 2010/10/04TRIO-CINEMA13

14. Elevation Calculate between Astronomical observatory Dorm and Antenna  Condition  650 km, Sun-synchronous, Launched 2012-07-01, Ascending node 00:00  Calculated by STK KHU, 2010/10/04TRIO-CINEMA14 Global Statistics Min Duration141553:55.354:11.516.234 sec Max Duration79150:37.201:37.2659.973 sec Mean Duration 518.578 sec8.642967 min Total Duration 761273.013 sec12687.88 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) : 1min 20sec

15. Set UHF Antenna KHU, 2010/10/04TRIO-CINEMA15

16. Test Interface KHU, 2010/10/04TRIO-CINEMA16

17. UHF Antenna Pattern KHU, 2010/10/04TRIO-CINEMA17

18. Antenna Test 1 – Rotator operating time 1.In manual Max operation time is 5 min 2.What does it mean exactly?  Just operate 5 min  When rotator has Max torque -> 5 min 3.Test Method  Tracking continuously 3 Amateur satellite  Rotator had about 1 min interval  Total rotator operation time : 30 min 4.Test Result  It works very well. Nothing happened.  But KHU has a spare rotator. KHU, 2010/10/04TRIO-CINEMA18

19. Antenna Test 2 – Direction KHU, 2010/10/04TRIO-CINEMA19  Rotator moves North 0°, increments to 30°I n a clockwise direction  Check the direction when it comes Counterclockwise from the re- circulated back  Hang the thread at the end of the Antenna for checking antenna’s exactly direction

20. Antenna Test 2 - Result KHU, 2010/10/04TRIO-CINEMA20 DirectionNorthNorth EastEastSouth EastSouthSouth West HRD0°30°60°90°120°150°180°210°240° Rotator9.5N19.5EN49.5EN86EXE147SE179SS206WX DirectionWestNorth WestNorthNorth East HRD270°300°330°360°400°430°450° RotatorS269WW300NW330N0N20EN50EN75E 1)0 ° - 60 ° 2)Can’t because Observotary is round shape 3)Rotator should be

21. Antenna test 3 – RF Chain 1.Test Chain  Handy Transceiver – UHF Antenna – TS2000 Transceiver 2.Distance  About 900m  KHU Astronomical Observatory - KHU Front gate 3.Result  Both transceiver work well 4.Future plan  Connect Helium 100 with handy transceiver for far-field test KHU, 2010/10/04TRIO-CINEMA21

22. Communication Test 1.Test Chain  Helium 100 – Computer – TNC – Transceiver 2.Result (Berkeley)  TNC built in Transceiver  Using GSEOS or the other terminal program – receive data 3.Result (KHU)  TNC transmit data  Transceiver(TS-2000) transmit and receive well  Connect TNC and transceiver : can’t receive data  Problem : connect cable or setting problem with transceiver -> check problem when I come back to KOREA KHU, 2010/10/04TRIO-CINEMA22

23. Future plan 1.TNC – Transceiver – Helium 100 test 2.TNC – Transceiver – UHF Antenna – Handy transceiver – Helium 100 test KHU, 2010/10/04TRIO-CINEMA23

24. THANK YOU KHU, 2010/10/04TRIO-CINEMA24