The present document specifies certain minimum technical performance requirements of Aircraft Earth Station (AES)
equipment with both transmit and receive capabilities for provision of aeronautical mobile satellite service, in the
frequency bands given in table 1.
Table 1: Frequency bands for the AES equipment specified in the present document
NOTE: The AESs are operating in one or more frequency ranges of the Fixed and
Mobile-Satellite Services.
The AES has the following characteristics:
These AESs are equipment for installation on aircraft.
The AES could consist of a number of modules from the antenna subsystem to the user interfaces.
The AES uses linear polarization.
The AES system uses digital modulation.
The AES operates through a GSO satellite at least 3° away from any other geostationary satellite operating in
the same frequency band and covering the same area.
The antenna of the AES is directional, with means of tracking the satellites, which can be achieved by using
either an active phase array or reflective type configuration.
These AESs are operating as part of a satellite network used for the distribution and/or exchange of
information between users.
These AESs are controlled and monitored by a Network Control Facility (NCF). The NCF is outside the scope
of the present document.
When on the ground, the AES does not transmit at elevation angles below 7o with respect to the local
horizontal plane, except at locations where transmissions below 7o are permitted by the local Administration;
(the minimum elevation angle is also limited as per clause 4.2).
The technical requirements in the present document are in two major categories:
- emission limits: to protect other radio services and systems from harmful interference generated by the AES
in normal use;
AES Control and Monitoring Functions (CMF): to protect other radio services and systems from unwanted
transmissions from (...abbreviated)