FINAL REPORT - Stakeholders - Ofcom

Airport
GNSS
Marker
Beacons
Introduction of L5 and E5
frequency bands for
GNSS.
Introduction of L5
frequency band (1176.45
+/- 12 MHz) and E5
frequency band (1188-
1208 MHz) circa 2010
Strong European lobby
for increased use of
GNSS as ‘sole means’ of
navigation in long-term,
and primary means
(supported by DME/DME)
in the medium-term.
Development of GNSS,
SBAS and GBAS for use
in precision landing
systems.
Replacement by full DME
coverage (to allow RNAV
terminal operations).
ILS Maintain frequency
requirements (in the lower
VHF band) due to
operational need and
socio-economic case.
MLS
MoD has plans to equip
50 MLS in UK; LHR has
MLS in service – other
airports may follow.
Benefits (operationally
and from a safety point of
view) exist – however, the
CBA is not strong enough
to drive equipage.
Possible replacement by
GNSS Landing System
(GLS).
Triple pairing
(MLS/ILS/DME) is an
issue for spectrum
efficiency.
Issue of interference
with GNSS. Possible
reallocation of DMEs.
Careful planning of
alternate uses is
required – GNSS is
expected to be the
primary application in
the medium-long term.
Protection of GNSS
bands. Possible
reallocation of DMEs.
VHF spectrum used
for GBAS (same
frequencies as ILS) –
may be an issue
where ILS and GLS
are both required.
Spectrum to be freed
in medium-term for
alternate uses.
Protect frequency
allocations for ILS
(from GBAS and VDL
Mode 4)
MLS spectrum will be
locally used in the
coming years. It
should be protected
from in-band
interference from
other applications in
the UK.
MLS spectrum
(internationally) would
be under pressure if
GLS is proved to meet
performance
requirements as MLS
would then be surplus
to requirements.
If this requirement
were removed, it
would enable better
frequency planning.
Optimum allocation of
DMEs is critical for the near
future. Recommend Ofcom
to push for studies into the
most efficient allocation.
Possible VOR/DME
unpairing as VORs are
decommissioned?
Optimum allocation of
DMEs is critical for the near
future. Recommend Ofcom
to push for studies into the
most efficient allocation.
MLS offers a completely
different spectrum, with
opportunities for growth.
Possible promotion of a
move to MLS.
ILS is a mature common
system – avionics have
been long deployed. Any
changes (MLS or GLS) will
require very strong cost or
safety cases.
MLS avionics are relatively
expensive – with ILS being
fully deployed, the status
quo makes an attractive
alternative.
The US Federal
Radionavigation Plan calls
for the movement to GLS
(no future MLS installations
are foreseen). Europe
believes significant issues
still exist with GLS;
therefore MLS is still viable
replacement for ILS in
Europe.
Studies should be initiated
assessing the impact of this
de-tripling.
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