1、QUESTION ITU-R 216-2/5*,*Compatibility of radionavigation, earth exploration-satellite (active), spaceresearch (active), mobile, and radiolocation services operating in the band5 350-5 650 MHz and compatibility between the radionavigation andradiolocation services in the band 2 900-3 100 MHz(1997-19
2、98-2001)The ITU Radiocommunication Assembly,consideringa) that the radionavigation service provides a safety of life function (RR 4.10) and harmfulinterference to it cannot be accepted;b) that radars in the radiolocation service operate on a primary basis worldwide in bandsincluding the 3 100-3 300
3、MHz band and operate on a secondary basis to the radionavigationservice in several bands around 3 and 5 GHz;c) that considerable radiolocation spectrum (approximately 1 GHz) has been removed ordowngraded since WARC-79, particularly affecting the band 3 400-3 700 MHz, and that a need isemerging for i
4、ncreased primary spectrum allocation for the radiolocation service;d) that the IMO has recently increased their safety requirements for shipborne radars that leadto the need for use of shorter pulse widths;e) that Recommendation ITU-R M.1372 identifies interference reduction techniques whichenhance
5、compatibility among pulsed radars;f) that radiolocation services, while recognizing radionavigation as a safety service asdelineated in RR 4.10, have demonstrated compatible operations with radionavigation services inthe bands 2 900-3 100 MHz and 5 350-5 650 MHz over many years because of using simi
6、lar systemcharacteristics of low duty cycle emissions, scanning beams, and interference reduction techniques;g) that the active spaceborne earth sensors in the Earth exploration-satellite and space researchservices have demonstrated compatible operations with the radiolocation service in several ban
7、dsover many years,h) that agenda item 1.17 calls for WRC-03 to consider upgrading the status of radiolocationallocations in the 2 900-3 100 MHz band;j) that agenda item 1.5 and Resolution 736 (WRC-2000) call for WRC-03 to considerallocating the 5 460-5 570 MHz band to the Earth exploration satellite
8、 (active) and space research(active) services and to consider allocating the 5 470-5 570 MHz band to the mobile service forwireless access systems including RLAN, and to review the status of the radiolocation service witha view to upgrading it in the frequency range 5 150-5 725 MHz,_* This Question
9、should be brought to the attention of the International Association of Marine Aids toNavigation and Lighthouse Authorities (IALA), the International Civil Aviation Organization (ICAO), theInternational Maritime Organization (IMO) and the Comit International radio-maritime (CIRM).* Former Question IT
10、U-R 216-2/8.- 2 -decides that the following Questions should be studied1 What are the technical characteristics, protection criteria, and other factors of radiolocationand radionavigation services needed to conduct studies of compatibility between these services inthe bands 2 900-3 100 MHz and 5 350
11、5 650 MHz?2 What is the feasibility of sharing between the radiolocation and radionavigation services inthe 2 900-3 100 MHz band?3 What is the feasibility of sharing between the aeronautical radionavigation andradiolocation services in the 5 350-5 470 MHz band?4 What is the feasibility of sharing b
12、etween the radionavigation and radiolocation services inthe 5 460-5 470 MHz band?5 What is the feasibility of sharing between the maritime radionavigation and radiolocationservices in the 5 470-5 650 MHz band?6 What is the feasibility of sharing between the mobile (i.e. RLAN) and radiolocationservic
13、es in the 5 470-5 650 MHz band?further decides1 that the results of the above studies should be included in one or more Recommendations;2 that the above studies should be completed by 2005.NOTE 1 These studies need to respect the safety-of-life considerations of the radionavigationservice expressed in RR 4.10 to ensure that future safety systems can operate without harmfulinterference.
