Computed clearance orbit results for the Redlich antenna and Wilcox 14/10 system indicate satisfactory linearity, course crossover, and signal clearance levels. Modeled course structure results indicate that Category I localizer performance should be obtained with a Redlich antenna system or a Wilcox 14/10 antenna system installed at the proposed location. Modeled course structure results for a 14/6 dual-frequency antenna exceed Category I tolerance limits. A 14/6 dual-frequency localizer antenna system, a Redlich system, and a Wilcox 14/10 system (currently under development) were modeled at the proposed localizer site. There is concern that reflections from the large airship hangars may degrade the localizer course beyond Category I tolerances. Computed localizer data are presented showing the effects of three large airship hangars on the performance of an ILS localizer proposed for runaway 32R at the Moffett Field Airport. MHz, respectively, for the glide paths, both being first adjacentĬhannels (300 kHz spacing) to the Sequence Number 2 glide pathĬhannel.ILS Mathematical Modeling Study of an ILS Localizer and Glide Slope Proposed for Runway 32R, Moffett Field Airport, California.ĭescribed here is the instrument landing system (ILS) math modeling performed by the Federal Aviation Administration (FAA) Technical Center at the request of the NASA-Ames Research Center Aircraft Operations Division. The case of the localizers, assign frequencies of 334.1 MHz and 333.5 Sequence Numbers 12 and 19, however,Īlthough providing wide frequency separation from Sequence Number 2 in Sequence Number 2 pairs the localizer frequency of 109.9 MHz with The second ten sequence pairings, it may be necessary to selectĬertain pairings out of sequence in order to meet the minimumĮxample: Referring to Chapter 3, 3.1.6.1.1, it will be noted that ILS Where it is necessary to make assignments in both the first ten and That, provided they are met for the localizer element, the glide pathĮlement is automatically covered. Selected sequentially, as required, from the following list:Īttachment C of Annex 10, ( 2.6 Deployment of ILS frequencies) provides some details about this selection:Ģ.6.5 In general, when international use of ILS systems is confined to the pairings listed in Chapter 3, 3.1.6.1.1, the criteria are such Landing system do not justify more than 20 pairs, they shall be Localizer and glide path transmitter frequencies of an instrument Pairing was carefully designed so that ILS could work without interferences ( harmonic and heterodyne) in certain conditions without being below the radio horizon of each other.Ī preferred pairing table is provided for such use:ģ.1.6.1.1 In those regions where the requirements for runway The pairing table was built back in 1956! (Fifth Session of the COM It's ITU which is responsible for the global (civil) use of the frequency spectrum. ICAO decisions in radiocommunication matters are subject to the frequency allotment and protection decisions taken under the auspices of the ITU during the World Radiocommunication Conference (WRC), held every four years. ![]() The localizer / glide path pairing table is part of Annex 10 of the Convention, Volume I, paragraph 3.1.6.ģ.1.6.1 The pairing of the runway localizer and glide path transmitterįrequencies of an instrument landing system shall be taken from theįollowing list in accordance with the provisions of Volume V, Chapter For aviation, the international body is ICAO and ICAO Chicago Convention is the main framework used to ensure international aviation operations are possible, safe and fair: However this local decision happens after an agreement already found in international bodies. As always the country is responsible for the final decision, so FAA/FCC will decide in the US (but see 's comment from an insider below), and I believe so does the MIC in Japan.
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