The present document specifies technical characteristics and methods of measurements for Vehicle-Mounted Earth Stations (VMES). The VMES system overview is presented below.
• The VMES may transmit and receive data when the vehicle is in motion and also when the vehicle is stationary.
• The VMES operates on wheeled or tracked vehicles and, therefore, may be subject to occasional disturbances and interruptions in the satellite link.
• The VMES is operating as part of a satellite network (e.g. star, mesh or point-to-point) used for the distribution and/or exchange of information.
• The VMES is comprised of all the equipment, electrical and mechanical, from the antenna itself to the interface with other communications equipment on a vehicle (usually referred to as the terrestrial interface).
• The VMES transmits on single carrier in the frequency range 14,00 GHz to 14,50 GHz.
NOTE 1: For the purposes of the present specification, OFDM modulation is considered as a single carrier.
• The VMES receives in one or more frequencies within the range from 10,70 GHz to 12,75 GHz.
• The VMES uses linear or circular polarization.
• The VMES is designed to operate through a geostationary satellite (or a cluster of co-located geostationary
satellites) that is at least 3° away from any other geostationary satellite operating in the same frequencies and over the same coverage area.
NOTE 2: Satellites may be spaced closer than 3°. In such cases, the satellite operator will inform the VMES client of the requirements of the system coordination agreements.
• The VMES transmits at elevations greater than or equal to 7° relative to the local horizon.
• The VMES is designed for unattended operation.
• The VMES is designed for both mobile and stationary operation. In the case of stationary operation, the VMES should not be accessible to the general public and operated safely.
• The VMES is controlled and monitored by an Antenna Control Facility (ACF). This function may be performed centrally (e.g. for a network of VMESs with a central hub) or it could be performed within the VMES for autonomous control. The ACF is outside the scope of the present document.
The present document applies to the VMES with its ancillary equipment and its various telecommunication ports, and when operated within the boundary limits of the operational environmental profile as defined for its intended use and when installed as required by its intended use or in the user documentation.
NOTE 3: The relationship between the present document and essential requirements of article 3 of Directive 2014/53/EU 2 is given in Annex A.
Required fields are indicated with *
