ITU-R M 1227-2-2001 Technical and operational characteristics of wind profiler radars in bands in the vicinity of 1 000 MHz《在1000MHz附近频段的风力测绘雷达的技术和运行特征》.pdf
《ITU-R M 1227-2-2001 Technical and operational characteristics of wind profiler radars in bands in the vicinity of 1 000 MHz《在1000MHz附近频段的风力测绘雷达的技术和运行特征》.pdf》由会员分享,可在线阅读,更多相关《ITU-R M 1227-2-2001 Technical and operational characteristics of wind profiler radars in bands in the vicinity of 1 000 MHz《在1000MHz附近频段的风力测绘雷达的技术和运行特征》.pdf(4页珍藏版)》请在麦多课文档分享上搜索。
1、 Rec. ITU-R M.1227-2 1 RECOMMENDATION ITU-R M.1227-2 Technical and operational characteristics of wind profiler radars in bands in the vicinity of 1 000 MHz (1997-2000-2001) The ITU Radiocommunication Assembly, considering a) Recommendation 621 of the World Administrative Radio Conference for Dealin
2、g with Frequency Allocations in Certain Parts of the Spectrum (Malaga-Torremolinos, 1992) (WARC-1992); b) that wind profiler radars (WPRs) are important meteorological systems used to measure wind direction and speed as a function of altitude; c) that many administrations plan to deploy WPRs in oper
3、ational networks in order to improve meteorological predictions and warnings, and support studies of the climate and increase the safety of navigation; d) the need for frequency bands in the vicinity of 50 MHz, 400 MHz and 1 000 MHz to permit the full performance capability of WPR operations, as req
4、uested by the World Meteorological Organization (WMO); e) that wind profilers operating near 1 000 MHz may be installed at fixed locations or may be transportable, to support a variety of requirements including environmental emergencies, pollution monitoring, etc.; f) that Resolution 217 (WRC-97) id
5、entified the frequency bands 904-928 MHz (Region 2), 1 270-1 295 MHz and 1 300-1 375 MHz for WPRs having due regard to the potential for incompatibility with other services; g) that selection of a proper frequency band for a WPR depends upon height coverage user needs, local climate and interference
6、 conditions, but performance of WPRs decreases as frequency increases; h) that, once designed and built, the WPRs could operate on centre frequencies over a range of 1%; j) that WPRs may have to share spectrum with other systems both current and future; k) that it would be desirable to have a limite
7、d number of frequencies authorized worldwide, in order to minimize research and development investment in the design of components; l) that technical standards would enhance compatibility with other systems within the same band, recommends 1 that minimum requirements on system performance, as in Ann
8、ex 1, should be adopted by administrations desiring to construct or operate WPRs in the bands near 1 000 MHz; 2 Rec. ITU-R M.1227-2 2 that the transmitter power should be limited to that necessary to obtain data at the maximum altitude for which the profiler was designed; 3 that the occupied bandwid
9、th (see Note 1) should be as close to the necessary bandwidth (see Note 2) as is technically and economically feasible to provide the required range resolution, noting that reduced values of resolution are generally acceptable at higher altitudes. Values are given in Annex 1. NOTE 1 Occupied bandwid
10、th: the width of a frequency band such that, below the lower and above the upper frequency limits, the mean powers emitted are each equal to 0.5% of the total mean power of the given emission. NOTE 2 Necessary bandwidth: for a given class of emission, the width of the frequency band which is just su
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