午夜欧美大片免费观看,欧美激情综合五月色丁香,亚洲日本在线视频观看,午夜精品福利在线

Based on the 6year observation data of the Nanjiao Sband radar in Beijing, the statistical characteristics of radar echoes and their spatial distribution are analyzed. The methods for identifying and correcting the clutter echoes and beam blocking by the statistical results are studied. The results show: (1) The climate characteristics of radar echo intensity probability is a good factor in identifying clutter echoes, and it is also very useful in identifying the radar beam blocking area and degree. Clutter echoes of Beijing are mainly located near the radar center and the piedmont areas of the western Beijing and northwestern Beijing. The radar beam blocking areas are mainly concentrated in the southeast because of the tall buildings and the northwest because of the topography. (2) Using the average vertical profile method with a changeable area, the high elevation echoes can be used to correct lowelevation clutter echoes, which can effectively correct the clutter echoes, and retain the local scale characteristics of echoes. The echo fillin of the beam blocking area is also made by this method, which can keep the continuity between the upper and lowerlevel elevation echoes. (3) The supported method of identifying clutter echoes and beam blocking can reflect the real situation of the local radar, being independent of prior knowledge. Compared with traditional ways, this method is more simple, reusable, and suitable for local weather.