Projekt

DSP for satellite communicatiosn

Udbyder

Vejleder

Sted

København og omegn

"VSAT’’ equipment is used for maritime satellite communications. The modulated signal format is most often based on the DVB-S2 or DVBS2X standard.

VSAT systems use very large and heavy aperture antennas in order to obtain high performance. Cobham is starting to investigate the possibility to combining multiple small maritime VSAT antennas on a ship to achieve better signal to noise ratio (C/N). By using two antennas it is possible to improve the performance by up to 3dB

Various signal processing techniques are today used to combined signals from multiple antennas. Examples are Equal Gain Combining [EGC] & Maximal Ratio Combining [MRC], but these algorithms have usually been applied in different contexts.

One of the specific challenges on a ship is that the antennas are typically placed far apart. There is accordingly a large signal delay between the antennas. This signal delay will follow the ships movements, 'roll', ‘pitch’ and ‘yaw’.

A simple simulation model of the physical path length difference between the satellite and the two antennas on a ship shall be developed. An optimal way to combine the two DVB-S2 satellite signals, using signal processing algorithms, shall be described and simulated together with the model for ship movements.

VSAT operates in the Ku or Ka microwave bands, and is based on an approx. 60-100 cm diameter reflector antenna.

I samarbejde med

Cobham SATCOM

Forudsætninger

Knowledge of digital signal processing and communications

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Kontakt

Virksomhed/organisation

DTU Fotonik

Navn

Søren Forchhammer

Stilling

Professor, Gruppeleder

Mail

sofo@fotonik.dtu.dk

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OM DTU

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45 25 25 25

dtu@dtu.dk

CVR-nr. 30 06 09 46

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