FINAL REPORT - Stakeholders - Ofcom

3.4.2.5 ILS
VOR/ILS localizers are allocated frequencies within the VHF band i.e. 108-117.975MHz
internationally (ARNS). In practice, this band is split between stand-alone VOR and
VOR/ILS, with VOR/ILS taking 108MHz – 111.975MHz.
328.6-335.4 MHz (ARNS) is allocated to the ILS glideslope in all three ICAO regions;
these frequencies are paired with the VHF value of the corresponding localiser.
3.4.2.6 VHF VOR
108-117.975MHz is allocated world-wide for ARNS. As mentioned above, the band is
shared between ILS and VOR, with stand-alone VOR frequencies extending from
112.000MHz – 117.975MHz. Where VORs are co-located with ILS, frequencies between
108-111.975MHz can be used.
3.4.2.7 C-Band MLS
5000-5250MHz (ARNS) is allocated internationally in the C-band. However, due to slow
take-up of Microwave Landing Systems in Europe, currently only 5030-5090MHz is used,
with the upper part of the band reserved for expansion. How much is reserved for ARNS
is a matter for debate.
3.4.2.8 L-Band DME
960-1215 MHz (ARNS/RNSS) is allocated internationally.
From the ITU’s Frequency Allocation Footnote 5.328 – The band 960 – 1215 MHz is
reserved on a world-wide basis for the use and development of airborne electronic aids to
air navigation and any directly associated ground-based facilities.
3.4.2.9 L-Band GNSS
All frequency allocations for RNSS are world-wide, allocated through the ITU:
• 1164 – 1215MHz (space-Earth, space-space);
• 1215 – 1300MHz (space-Earth, space-space);
• 1300 – 1350MHz (Earth-space);
• 1559 – 1626.5MHz (space-Earth, space-space).
Note: 1610 - 1626.5 MHz is currently co-assigned with radio-determination
(radionavigation) satellite, Mobile Satellite Services and Radio Astronomy sharing the
frequency. GLONASS radionavigation satellite service currently uses the lower part of this
band, but after 2005 is expected to transfer to the 1559-1610 MHz band [source: ICAO
Doc 9718].
Actual usage of the frequency is defined below for the three current main candidate
GNSS solutions – GPS, GLONASS and Galileo. Note that for certain frequencies, energy
at the carrier frequency is minimal, with the sidelobes actually dominating the overall
signal.
For GPS (US Military Global Positioning System):
• L1 Link 1, carrier frequency = 1575.42 MHz +/- 12MHz; civil frequency.
• L2 Link 2, carrier frequency = 1227.6 MHz +/- 12MHz. (military frequency for
Precise Positioning Service, with civil usage progressively coming on-line from
2003 to 2008).
• L3 Link 3, other use.
Page 87