1、QUESTION ITU-R 251/7*Ground-based passive sensors (2010) The ITU Radiocommunication Assembly, considering a) that ground-based passive sensing is becoming increasingly important in the observation and monitoring of the Earth environment and phenomena affecting it; b) that these observations are made
2、 from platforms that may be ground-based, or from airborne platforms flown on balloons or aircraft; c) that RR No. 5.563A specifically addresses ground-based passive atmospheric sensing, noting a) that the definition of the Earth exploration-satellite service (EESS) in RR No. 1.51 indicates that inf
3、ormation is collected from airborne or Earth-based platforms; b) that ground-based passive sensing is currently operated largely in frequency bands allocated to either EESS (passive) or radio astronomy, decides that the following Questions should be studied 1 What are the main types of ground-based
4、passive observations and what are their main applications? 2 What are the technical characteristics, operational and protection requirements of the ground-based passive sensing stations used to make these observations? 3 What are the frequency bands in which these measurements are made? further deci
5、des 1 that the results of the above studies should be included in one or more Recommendation(s) and/or Report(s) as appropriate; 2 that the above studies should be completed by the year 2015. Category: S2 *This Question should be brought to the attention of the World Meteorological Organization (WMO).
