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

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

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

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

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

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

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

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

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

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

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

KHU UHF Antenna KHU, 2010/10/04TRIO-CINEMA12 Antenna 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 to 9600 baud, 8 data bits,1 st op bit, no parity, Hardware control( CTS port) Antenna PolarizationLHCP Rotator Azimuth velocity58 60 Hz Rotator Elevation velocity67 60 Hz Operating temperature -40 to +70 ℃

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

Elevation Calculate between Astronomical observatory Dorm and Antenna  Condition  650 km, Sun-synchronous, Launched , Ascending node 00:00  Calculated by STK KHU, 2010/10/04TRIO-CINEMA14 Global Statistics Min Duration141553:55.354: sec Max Duration79150:37.201: sec Mean Duration sec min Total Duration sec min The number of Total Contact times : The number of out of contact times : > 9.14% Mean Contact time(min) : 8 Mean out of contact time(min) : 1min 20sec

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

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

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

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

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

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

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

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

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

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