 
The VDL 4000/GSI Ground Station has been developed for advanced CNS/ATM applications that depend on time-critical data communication where predictability, reliability and redundancy are required.
The ground station is a key component at the airport for realising the highest level of operation in A-SMGCS.
The system supports services such that a complete gate-to-gate operation can be realised. These services include ADS-B, TIS-B, FIS-B, Point-to-Point, and DGNSS augmentation (GNS-B).
The ground station operates in accordance with the ICAO standard for VDL Mode 4 digital radio link. Together with mobile transponders, an integrated system for communication, navigation and surveillance services is created.
The ground station is designed for several operational alternatives, e.g. local services and wide area network solutions. System applications are based on the VDL Mode 4 digital data link and IP protocols. For CPDLC, ATN is also supported if required.
The ground station can easily interface with other surveillance systems through the standardised Asterix protocol, enabling a complete surveillance picture at the airport derived from several sources.
Ground stations and a ground-based network will provide increased functionality and capability for wide area coverage of advanced ATM applications.
The functionality of the ground station is tailored to system-specific service applications by its software configuration.
Specifications
Equipment |
| VDL Mode 4 Transponders (dual or hot standby) |
| Dual GNSS reference receivers |
| Compact PCI computer: |
| - Data Management Subsystem |
| - Monitoring and Control Subsystem |
| Power supply: |
| - Uninterruptible power supply |
| - Power supply unit |
| Standard 19 inch rack: |
| - Side panels, front and back doors |
| - Interior mounting devices |
| - Rack fans |
| - Sensor Subsystem |
| - Keyboard & Display |
| Time Reference Subsystem (TRS) |
| Installation material: |
| - GPS antenna (1/receiver) |
| - VHF Tx antenna (1/VDL4 unit) |
| - VHF Rx antenna (1/VDL4 unit) |
| - GPS antenna (TRS) |
Services |
| ADS-B |
| FIS-B |
| GNS-B |
| Point-to-point |
| TIS-B |
Environmental |
| Temperature, operating |
–5°C to +45°C |
| Temperature, storage (excluding batteries and displays) |
–40°C to +70°C |
External interfaces |
| GPS antenna |
TNC female |
| Local access |
TCP/UDP/IP, RJ45 Ethernet |
| Main Power |
110/240 V AC 50/60 Hz |
| Protocols |
Asterix, SNMP v.2 |
| Remote access |
TCP/UDP/IP, RJ45 Ethernet |
| Services |
TCP/UDP/IP, RJ45 Ethernet |
| TRS antenna |
N-type female |
| VHF Rx antenna |
N-type female |
| VHF Tx antenna |
N-type female |
Receiver |
| CCI |
<10 dB |
| Frequency stability |
+/– 0.0002% = +/– 2 ppm |
| Channel spacing |
25 kHz |
| Sensitivity |
<–98 dBm |
| Tuning range |
118.000 – 136.975 MHz |
Transmitter |
| Baud rate |
19200 bps |
| Channel selection time |
< 13 ms |
| Frequency stability |
+/–0.0002% = +/– 2 ppm |
| Channel spacing |
25 kHz |
| Modulation scheme |
GFSK |
| Tuning range |
118.000 – 136.975 MHz |
| TX to RX turnaround time |
< 1 ms |
| Output power (adjustable) |
40 dBm into 50 Ohm (10W) |
Certification |
| CE-mark |
| ED-109/DO-278 |
| ETSI |
EN 301842 |
| ICAO Manual on VDL Mode 4 Doc |
Doc. 9816 |
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