1、QUESFTION ITU-R 110-1/4*Interference to the aeronautical mobile-satellite (R) service (1992-2002) The ITU Radiocommunication Assembly, considering a) that the aeronautical mobile-satellite (R) service (AMS(R)S) provides communications relating to safety and regularity of flight (see Nos. 1.36 and 1.
2、59 of the Radio Regulations (RR); b) that there is a need to prevent harmful interference to the AMS(R)S; c) that the types of radiation which can cause harmful interference can differ widely depending on the particular technical and operational characteristics of the services involved; d) that it m
3、ay not be possible in some cases to identify in detail the characteristics of the interfering radiation; e) that the radiations from potential sources of harmful interference are, or should be, subject to certain standards; f) that the practical control of harmful interference can only be effected b
4、y individual administrations; g) that Contracting States of the International Civil Aviation Organization (ICAO) are under certain obligations relative to the Standards and Recommended Practices (SARPs) for AMS(R)S; h) that RR No. 4.10 recognizes that safety services require special measures to ensu
5、re freedom from harmful interference; j) that a safety service must take considerable precautions to ensure that any radio service sharing the same radio band is constrained sufficiently to leave an adequate margin under all likely circumstances; k) that parts of the frequency bands allocated to the
6、 AMS(R)S are also allocated to the fixed service in certain countries (RR No. 5.359) on a co-primary basis and also conditionally authorized for AM(R)S (RR No. 5.357); l) that Recommendation ITU-R M.1234 was developed to recommend aggregate and single-entry interference protection criteria for the A
7、MS(R)S, decides that the following Question should be studied 1 What are the recommended methods of calculation of interference to the AMS(R)S? 2 How should the out-of-band emissions from other radio services and ISM operating in other bands be accounted for in the protection criteria of the AMS(R)S? further decides 1 that the results of the above studies should be included in (a) Recommendation(s); 2 that the above studies should be completed before 2005. _ *Former Question ITU-R 110-1/8.
