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Foreword Annex 10 - Aeronautical Telecommu~tications
Table A. Amendments to Annex 10, Volume 111
Adopted
EJfeciivc
Amendment Source(s) Subject(s) Applicable
70 Air Navigation Comm~ssion, Introduction of new Volume IIT and SAWS relared to the Aeronautical 20 March 1995
Third Meeung 01 the Aero- Mobile-Satellite Service (AMSS) 24 July 1995
naut~calM ob~lcC ommunications 9 November 1995
Panel (AMCP)
(vii)
INTERNATIONAL STANDARDS AND
RECOMMENDED PRACTICES
CHAPTER 1. DEFINITlONS
Note 1.- All references to "Radio Regulations" are to the
Radio Regularions published bj rhe International Telecommrr-
/Urntion U~zion.
Note 2.- This Part uf Anriex 10 includes Standards and
Recommended Practices for certain. .forms of equipment for
communication systems. While the Contracting State wilE
determine the necessit;v.for specific installations in accordan.ce
with the conditions prescribed in the relevunt Standard or
Recommended Practice, review of the need for speci,fic installation
and the formulation of ICAO opinion and reconmzendations
to Contracrzng States concerited, is carried our
periodically by Corincil, ordinarily or1 the basis of recommendations
qf Regional Air Navigation Meetings (Doc 8144,
Directives to Regional Air Navigation Meetings and Rules of
Procedure for their Conduct).
Note 3.- This chaprer contains getteml defznitions relevant
to comm~cnications ystems. Definitions specific ro 2uch o f
rhe systenzs included in this volume are contained in the
relevant chapters.
Aircrafi earth station (AESj. A mobile earth station in the
aeronautical mobile-satellite service located on board an
aircraft (see also "GES").
Bit error rate (BER). The number of bit errors in a sample
divided by the total number of bits in the sample,
generally averaged over many such samples.
Carrier-to-multipath ratio (C/M). The ratio of the carrier
power received directly, i.e. without reflection, to the
multipath power, i.e. carrier power received via reflection.
Carrier-to-noise density ratio (C/N,). The ratio of the total
carrier power to the average noise power in a 1 Hz bandwidth.
usually expressed in dBHz.
Channel rate. The rate at which bits are transmimed over the
RF channel. These bits include those. bits used for framing
and error correction, as well as the information bits. For
burst transmission, the channel rate refers to the
instantaneous burst rate over the period of the burst.
Channel rate accuracy. This is relative accuracy of the clock
to which the transmitted channel bits are synchronized. For
example, at a channel rate of 1.2 kbits/s, maximum error
of one part in 10~mplietsh e maximum allowed error in
the clock is ? 1.2 x 10" Hz.
Circuit mode. A configuration of the communications network
which gives the appearance to the application of a dedicated
transmission path.
Doppler shijit. The frequency shift observed at a receiver due
to any relative motion between transmitter and receiver.
End-to-end. Pertaining or relating to an entire communication
path, typically from ( I ) the interface between the information
source and the communication system at the transmitting
end to (2) the interface between the communication
system and the information user or processor or
application at the receiving end.
End-user. An ultimate source and/or consumer of information.
Equivalent isotropically radiated power (EZRP). The total
power which would have to be radiated by an isotropic
antenna to produce the same flux density at the desired
location.
Energy per symbol to noise density ratio (EJN,,). The ratio of
the'average energy transmitted per channel symbol to the
average noise power in a 1 Hz bandwidth, usually
expressed in dB. For A-BPSK and A-QPSK, one channel
symbol refers to one channel bit.
Forward error correction (FEC). The process of adding
redundant information to the transmitted signal in a
manner which allows correction, at the receiver, of errors
incurred in the transmission.
Gain-to-noise temperature ratio. The ratio, usually expressed
in dB/K, of the antenna gain to the noise at the receiver
output of the antenna subsystem. The noise js expressed as
the temperature that a 1 ohm resistor must be raised to
prodocc the same noise power density.
ANNEX 10 - VOLUME 111
Annex 10 - Aeronautical Telecommunications Volume 111
Ground earth station (GES). An earth stalion in the fixed
satellite service, or, in some cases, in the aeronautical
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