1、STD-ITU-R RECMN M.322b-ENGL I1997 m 4855232 0532038 9b7 m Rec. ITU-R M.1226 73 RECOMMENDATION ITU-R M.1226“ TECHNICAL AND OPERATIONAL CHARACTERISTICS OF WIND PROFILER RADARS IN BANDS IN THE VICINITY OF 50 MHz (Question ITU-R 102/8) ( 1997) Summary This Recommendation provides technical and operation
2、al characteristics of wind profiler radars in frequency bands near 50 MHz. The Recommendation includes representative power to the antenna line, necessary bandwidth, occupied bandwidth, representative antenna side-lobe suppressions and guidance for wind profiler radar sharing considerations. It also
3、 contains in Annex 1 representative values and minimum requirements on system performance for wind profiler radars in bands near 50 MHz. The ITU Radiocommunication Assembly, cons idering Recommendation No. 621 of the World Administrative Radio Conference for Dealing with Frequency that wind profiler
4、 radars (WPRs) are important meteorological systems used to measure wind direction and that many administrations plan to deploy WPRs in operational networks in order to improve meteorological the need for frequency bands in the vicinity of 50, 400 and 1000 MHz to permit the full performance that win
5、d profilers operating near 50 MHz are ideally suited for meteorological measurements (wind, a) Allocations in Certain Parts of the Spectrum (Malaga-Torremolinos, 1992) (WARC-92); b) speed as a function of altitude; C) predictions and warnings, and support studies of the climate and increase the safe
6、ty of navigation; d) capability of WPR operations, as requested by the World Meteorological Organization (WO); e) atmospheric turbulence, tropopause height) up to high altitudes (20-25 km); f) g) h) that, once designed and built, the WPRs could operate on centre frequencies over a range of It 1%; th
7、at WPRs may have to share spectrum with other systems both current and future; that it would be desirable to have a limited number of frequencies authorized worldwide in order to minimize that technical standards would enhance compatibility with other systems within the same band, research and devel
8、opment investment in the design of components; . 45 76 Rec. ITU-R M.1226 Antenna side-lobe suppression (dB) Median Minimum 40 33 30 23 23 13 Video bandwidth 1 Measurement system IF bandwidth Suppression of spurious emission: 55 dB Suppression of second harmonic: 60 dB. 3.3 Antenna side-lobe suppression for specified angles above the horizon TABLE 3 COPYRIGHT International Telecommunications Union/ITU RadiocommunicationsLicensed by Information Handling Services
