v-band造句

• According to statistics parameters of the typical clouds over xi ' an region and cloud data obtained from the global distribution of cloud cover under the auspices of world meteorological organization , for xi ' an region typical cloud , the parameters of khragian - mazin cloud drop size distribution are obtained . based on xi ' an cloud water content profile , on earth - space paths , attenuation due to cloud are calculated by means of the k - m distribution . it is shown that the attenuation induced by cloud are taken into account at ka - at elevation angle smaller than 30 and v - band paths
  第三，根据西安地区气象观测数据，讨论了西安典型云的宏观和微观物理特性；根据西安典型云的观测结果和世界气象组织提供的数据，得到西安典型云的k - m云滴谱参数；并根据西安地区云的液水含量，计算了地一空路径上云的衰减，结果表明，在v波段和仰角小于30度的ka波段路径，云的衰减需加以考虑。