Ground Segment - AMSAT · Set Top Box / PC Card Megasat HD 800 / TechnoTrend S2-3200. HAMTV Ground...

HAMTV Ground Segment

-= HamTV Ground Segment =- Amsat-Italia @ Florence HamFest April 12, 2014

Ground SegmentHAMTV standard

Florence HamFest – April 12, 2014

HamTV transmitter

www.kayser.it/index.php/exploration-2/ham-tv

“Space Station Reference Coordinate Systems” – ISS Program – Revision F – 2001 – NASA - JSC

Columbus Module

https://directory.eoportal.org/web/eoportal/satellite-missions/i/iss-columbus

http://spacestationlive.nasa.gov/displays/topoDisplay1.html

Trajectory Operations Officer - TOPO

Attitude Determination and Control Officer - ADCO

http://spacestationlive.nasa.gov/displays/adcoDisplay2.html

#43#41

ARISS Patch Antennas 41 & 43 – Columbus Module - ISS

http://www.ariss-eu.org/Columbus_in_Space.jpg

http://www.ariss-eu.org/ARISS_43_Front.JPGhttp://www.ariss-eu.org/ARISS_41_Front.JPG

HAMTV Standard GS

Each Ground Station will operate as a receive-only (R/O) terminal i.e. the station can

receive, demodulate and record data transmitted in the S-band (2360 - 2450 MHz).

The antenna used for data reception consists of an offset focus system with azimuth

and elevation mount; it is capable of program controlled operation, however manual

capability as backup solution is foreseen as well.

Antenna 1.2 m Offset Dish

Feed LHCP Helix

Preamplifier/Down Converter Kuhne KU LNC-25

RF Coax Cable LMR-400

Set Top Box / PC Card Megasat HD 800 / TechnoTrend S2-3200

HAMTV Standard GS

Orbitron

Modified

Tioune

Level Chart for HAMTV

HamTV Standard Station: 1.2m Offset Dish [25dBi]

HamTV Ground Station Test @ K.I. - Livorno

0 1 2 3 4 5 6 7 82

G/T dB(1/K)

Sun Flux: 138 SFU at 2.4 GHz at April 2, 2014, 1200 UTC @ San Vito

2369 MHz

2395 MHz

2422 MHz

2437 MHz

G/T measurement and Rotator setup

HamTV standard Ground Station Receiving HamTV

F6DZP has developed

Tioune SW suite to

monitor and manage

Techno Trend Boards

S1600 and S3200.

Tioune Data Reader is

part of the SW suite.

Different Antenna solutions

Fixed Helix Antenna – Tested by IZ8YRR

Fixed Helix Antenna

400 600 800 1000 1200 1400 1600 1800 2000 2200 24000

Range [km]

400 600 800 1000 1200 1400 1600 1800 2000 2200 2400-360

Effects of the onboard antenna Off-Nadir Angle

for a pass with Max Elevation = 64°

threshold

Off-Nadir angle = 9° (#43)

SR = 2.0 MSym/s

G/T = 2.0 dB(1/K)

400 600 800 1000 1200 1400 1600 1800 2000 2200 24000

Range [km]

400 600 800 1000 1200 1400 1600 1800 2000 2200 2400-360

4’:51’’

SR = 2.0 MSym/s

G/T = 2.0 dB(1/K)

400 600 800 1000 1200 1400 1600 1800 2000 2200 24000

Range [km]

400 600 800 1000 1200 1400 1600 1800 2000 2200 2400-360

5’:38’’

SR = 1.3 MSym/s

G/T = 2.0 dB(1/K)

400 600 800 1000 1200 1400 1600 1800 2000 2200 24000

Range [km]

400 600 800 1000 1200 1400 1600 1800 2000 2200 2400-360

400 600 800 1000 1200 1400 1600 1800 2000 2200 24000

Range [km]

400 600 800 1000 1200 1400 1600 1800 2000 2200 2400-360

Off-Nadir angle = 9° & 13°

SR = 1.3 MSym/s

G/T = 2.0 dB(1/K)

400 600 800 1000 1200 1400 1600 1800 2000 2200 24000

Range [km]

400 600 800 1000 1200 1400 1600 1800 2000 2200 2400-360

s]5’:31’’

5’:05’’

Off-Nadir angle = 0° & 13°

SR = 1.3 MSym/s

G/T = 2.0 dB(1/K)

Comparison between Nadir and Off-Nadir pointing antennas: Best performances with Off-Nadir

mounting, which exploites maximum gain at larger ranges.

Max El.=40°

Conclusions

� Off-Nadir mounting increases link duration

� From this point of view the 13° (#41 TBC) is the best

� 13° offset antenna allows 4’:31’’ @ 2.0 MSym/s and 40° pass, using a HAMTV

standard station. i.e. 1.2 m, G/T=2.0 dB(1/K)

� 13° offset antenna allows 5’:31’’ @ 1.3 MSym/s and 40° pass, using a HAMTV

standard station. i.e. 1.2 m, G/T=2.0 dB(1/K)

� Higher passes allows longer duration, but impose stronger constrain on tracking

(greater Az. Speed). A 64° pass allows 5’:03’’ and 5’:52’’ respectively.

The effects of the off-Nadir orientation of on-board

ARISS-41 and ARISS-43 antennas

Measured RF performances during commissioning step 1

Signal monitoring with the R&S

FSV Spectrum Analyzer

Frequency: 2369 MHz @ M1

Symbol Rate: 1.3 MS/s

C/N> 30 dB

Measured RF performances during commissioning

Live TV reception with

the TT-3200

(Matera #1)

Frequency: 2395 MHz

Symbol Rate: 2 MS/s

MER: 31 dB

400 600 800 1000 1200 1400 1600 1800 2000 2200 24000

Range [km]

400 600 800 1000 1200 1400 1600 1800 2000 2200 2400-360

Our model prediction: commissioning step 2, 12:44:20 UTC, Matera station.

C/N =44.5 dB at 2.0 MSymb/s, Off-Nadir 9°, range 625 km, G/T=25.7 dB(1/K).

Measured RF performances during commissioning

G/T of Matera RX was

measured the day before

using Cassiopeia A as a

calibrated noise source

Matera Laser Ranging Observatory facility ( HamTV commissioning steps 1&2)

http://ivs.nict.go.jp/mirror/publications/ar2012/nsmate/

One of the first proposed examples of chained stations

(from Document AMSAT Italy GSO R1.1, 13/04/ 2012)

Chaining Chaining GroundstationsGroundstations

location of present ground stations in Europe (range 700 Km)location of present ground stations in Europe (range 700 Km)

The original presentation was given by

Amsat-Italia HamTV team

at the ARISS International Meeting in ESA ESTEC

April 3-5, 2014

Thank you!

www.amsat.it

On behalf of Amsat-Italia

Fabio Azzarello – IZ5XRC@amsat.org

Ground Segment - AMSAT · Set Top Box / PC Card Megasat HD 800 / TechnoTrend S2-3200. HAMTV Ground...

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