1、QUESTION ITU-R 288/4*Characteristics and operational requirements of radionavigation-satelliteservice (space-to-Earth, space-to-space, Earth-to-space) systems(2004-2006-2007)The ITU Radiocommunication Assembly,consideringa) that radionavigation-satellite service (RNSS) systems provide worldwide prec
2、ision, timing,positioning and navigation information for many applications, including critical and safety of lifeapplications;b) that there are various existing or planned RNSS systems;c) that the bands 149.9-150.05 MHz and 399.9-400.05 MHz are allocated worldwide on aprimary basis to the RNSS effec
3、tive until 1 January 2015;d) that the bands 1 164-1 300 MHz, 1 559-1 610 MHz and 5 010-5 030 MHz are allocatedworldwide on a primary basis to the RNSS (space-to-Earth, space-to-space);e) that the bands 1 300-1 350 MHz, and 5 000-5 010 MHz are allocated worldwide on aprimary basis to the RNSS (Earth-
4、to-space);f) that these frequency bands are also allocated on a primary basis to other services;g) that characteristics and protection criteria for RNSS systems may differ between bands anduser applications;h) that WRC-2000 concluded that sharing of the 1 559-1 610 MHz RNSS band by any co-frequency
5、radiocommunication service is not recommended;j) that studies on the compatibility between RNSS and other services or systems are ongoingor planned;k) that Recommendations ITU-R M.1088, ITU-R M.1477 and ITU-R M.1479 providecharacteristics and descriptions of several types of receivers that are used
6、with several RNSSsystems;l) that the design of RNSS systems referred to in considering f) has recently evolved, and thatthe corresponding relevant Recommendations consequently may require updating;m) that there is an essential need to protect RNSS systems from the interference caused byother service
7、s and systems, to the extent provided by the Radio Regulations,_* Former Question ITU-R 236-2/8Formatted: English (U.K.), Not Highlight- 2 -decides that the following Question should be studiedWhat are the technical and operational characteristics of RNSS systems to be used in sharing andcompatibility studies with other services or systems?further decides1 that the results of the above studies should be included in one or more Recommendationsand/or Reports;2 that the above studies should be completed no later than 2010.Category: S2
