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

KHU Ground Station

Nayoung Yoon

KHU, 2010/10/041TRIO-CINEMA

Agenda

1. KHU Ground Station (Introduction)1) Ground Station context diagram2) Integrated Ground Support Software(IGSS)3) UHF RF Chain4) Ground system configuration5) Ground Station computer configuration6) Ground Station Equipment

2. Antenna Setting1) KHU UHF Antenna2) UHF Antenna Pattern3) Antenna Test

3. RF Equipment Test Transceiver Transceiver - Helium 100 TNC

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KHU Ground Station

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Ground Station Context Dia-gram

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Integrated Ground Support Software (IGSS)

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UHF RF Chain

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UHF Ground system configura-tion

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Ground Station computer Configura-tion

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Ground Station Equipment

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Tracking Subsystem

Rotator

Rotator Controller

Satellite Tracker S/W (HRD)

RF Uplink Subsystem

Antenna

TNC

Transceiver

Telemetry & Commanding SubsystemGSEOS

RS Decoder

Mission Planning Subsystem MPS

Attitude Control Subsystem Attitude Simulator

Ground Computer

Pc

Monitor

UPS

Ham Radio Deluxe – subpro-gram

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Antenna Setting

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KHU UHF Antenna

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Antenna gain 9.8dBi @ 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-232C 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 veloc-ity

67 sec @ 60 Hz

Operating temperature -40 to +70 ℃

Elevation Calculate between Astro-nomical observatory Dorm and An-tenna

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Elevation Calculate between Astro-nomical observatory Dorm and An-tenna

Condition 650 km, Sun-synchronous, Launched 2012-07-01, Ascending node

00:00 Calculated by STK

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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) : 1min 20sec

Set UHF Antenna

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Test Interface

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UHF Antenna Pattern

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Antenna Test 1 – Rotator operating time

1. In manual Max operation time is 5 min2. 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.

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Antenna Test 2 – Direction

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Rotator moves North 0°, incre-ments to 30°I n a clockwise di-rection

Check the direction when it comes Counterclockwise from the re-circulated back

Hang the thread at the end of the Antenna for checking an-tenna’s exactly direction

Antenna Test 2 - Result

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Direc-tion

North North East East South East South South West

HRD 0° 30° 60° 90° 120° 150° 180° 210° 240°

Rotator 9.5N19.5

EN49.5

EN86E X E147S E179S

S206W

X

Direc-tion

West North West North North East

HRD 270° 300° 330° 360° 400° 430° 450°

RotatorS269

WW300

NW330

N0 N20E N50E N75E

1)0 ° - 60 °2)Can’t because Observotary is round shape3)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

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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 trans-

ceiver -> check problem when I come back to KOREA

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Future plan

1. TNC – Transceiver – Helium 100 test2. TNC – Transceiver – UHF Antenna –

Handy transceiver – Helium 100 test

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THANK YOU

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