VHF Data Exchange System (VDES)
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1 VHF Data Exchange System (VDES) MHz MHz Juan Lizarraga Cubillos and Frank Zeppenfeldt {juan.lizarraga.cubillos, 08/04/2014
2 VDES = VDE-Terrestrial + VDE-SAT VDE-Terrestrial: Ship Ship Ship Shore VDE-SAT: Uplink Downlink Most ships, regardless the class, have VHF radios. The satellite component of the VDES wants to take advantage of this fact to provide maritime services to a vast population of vessels (when beyond shore station coverage) by reusing their existing VHF infrastructure. VDES Juan Lizarraga Cubillos and Frank Zeppenfeldt 08/04/2014 TEC Slide 2
3 VDES Sharing -125 db(w/(m2*4 khz)) Orbcomm FCC Land Mobile Services (ECC recommendation T/R 25-08) Land Fixed Services (WP 5C ITU-R SF.357) VDES Juan Lizarraga Cubillos and Frank Zeppenfeldt 08/04/2014 TEC Slide 3
4 Definitions zenith Range Off-nadir angle Altitude Sub-satellite point (Nadir direction) VDES Juan Lizarraga Cubillos and Frank Zeppenfeldt 08/04/2014 TEC Slide 4
5 Definitions Contact time VDES Juan Lizarraga Cubillos and Frank Zeppenfeldt 08/04/2014 TEC Slide 5
6 VDES Sharing: FS -125 db(w/(m2*4 khz)) Orbcomm FCC Land Mobile Services (ECC recommendation T/R 25-08) Land Fixed Services (WP 5C ITU-R SF.357) VDES Juan Lizarraga Cubillos and Frank Zeppenfeldt 08/04/2014 TEC Slide 6
7 VDES Sharing: FS Interference Criteria (ITU-R F.357) Long-term >20% Short-term >0.01% < 1% Latitude Average number of satellite passes per day Corresponding accumulated duration per day in minutes/corresponding percentage VDES Juan Lizarraga Cubillos and Frank Zeppenfeldt 08/04/2014 TEC Slide /1.5 % 30/2 % 94/6.5 %
8 VDES Sharing: MS -125 db(w/(m2*4 khz)) Orbcomm FCC Land Mobile Services (ECC recommendation T/R 25-08) Land Fixed Services (WP 5C ITU-R SF.357) VDES Juan Lizarraga Cubillos and Frank Zeppenfeldt 08/04/2014 TEC Slide 8
9 ECC Recommendation T/R db( V/m) 12 db( V/m) 12 db( V/m) P out VDES Juan Lizarraga Cubillos and Frank Zeppenfeldt 08/04/2014 TEC Slide 9
10 Coordination Threshold 12 db( V/m) E P out Coordination Threshold VDES Juan Lizarraga Cubillos and Frank Zeppenfeldt 08/04/2014 TEC Slide 10
11 Coordination Threshold P out Coordination Threshold Antenna 1 Coordination Threshold Antenna 2 Coordination Threshold Antenna 3 12 db( V/m) P out VDES Juan Lizarraga Cubillos and Frank Zeppenfeldt 08/04/2014 TEC Slide 11
12 LFS Antennas (ITU-R F.1336) 12 db( V/m) 0 dbd 3 dbd 6 dbd 9 dbd P out Gain [dbi] [deg] VDES Juan Lizarraga Cubillos and Frank Zeppenfeldt 08/04/2014 TEC Slide 12
13 Coordination Mask 0 dbd 3 dbd 6 dbd 9 dbd Mask P out 124 PSFD [db(w/(m2*4khz))] P out [deg] 12 db( V/m) VDES Juan Lizarraga Cubillos and Frank Zeppenfeldt 08/04/2014 TEC Slide 13
14 Example Orbital Element Value Units Eccentricity 0 - Semi major axis (Altitude) (550) km Inclination Degrees Right ascension of the ascending node 0 Degrees Argument of the periapsis 0 Degrees Mean anomaly at epoch 0 Degrees VDES Juan Lizarraga Cubillos and Frank Zeppenfeldt 08/04/2014 TEC Slide 14
15 Example VDE-SAT Mask PSFD [db(w/(m2*4khz))] [deg] VDES Juan Lizarraga Cubillos and Frank Zeppenfeldt 08/04/2014 TEC Slide 15
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