3/30/2023 0 Comments Localizer and glideslope![]() Original Assignee International Standard Electric Corp Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.) Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.) Expired - Lifetime Application number US435654A Inventor Gunter Hofgen Werner Poschadel Current Assignee (The listed assignees may be inaccurate. Google Patents Instrument landing system with microwave course pattern transmissionĭownload PDF Info Publication number US3887922A US3887922A US435654A US43565474A US3887922A US 3887922 A US3887922 A US 3887922A US 435654 A US435654 A US 435654A US 43565474 A US43565474 A US 43565474A US 3887922 A US3887922 A US 3887922A Authority US United States Prior art keywords microwave clearance radiation localizer glide Prior art date Legal status (The legal status is an assumption and is not a legal conclusion. Google Patents US3887922A - Instrument landing system with microwave course pattern transmission MHz, respectively, for the glide paths, both being first adjacentĬhannels (300 kHz spacing) to the Sequence Number 2 glide pathĬhannel.US3887922A - Instrument landing system with microwave course pattern transmission 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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