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气象:2018,44(11):1434-1444
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新一代天气雷达布网设计的有效覆盖和地形遮挡分析
朱丹,谷军霞,师春香,周自江
(江西省宜春市气象局,宜春 336000;国家气象信息中心,北京 100081)
Analysis of Effective Coverage and Terrain Blockage for Next Generation Radar Network Design
ZHU Dan,GU Junxia,SHI Chunxiang,ZHOU Zijiang
(Yichun Meteorological Office of Jiangxi, Yichun 336000; National Meteorological Information Centre, Beijing 100081)
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投稿时间:2017-04-26    修订日期:2018-03-18
中文摘要: 一般情况下,地形影响造成的雷达波束遮挡是长期保持不变的。研究雷达地形遮挡情况有助于提升雷达探测资料的有效性和可靠性。利用先进星载热发射和反射辐射仪全球数字高程模型地形数据,对我国已建成的208个新一代天气雷达站点进行地形遮挡分析,计算业务体扫模式(Volume Coverage Pattern modes,VCP)21的九个仰角下200 km范围内雷达反射率的波束阻挡系数,绘制观测仰角分别为0.5°、1.45°、2.4°和3.35°时雷达有效观测区域的覆盖图,计算相应的有效覆盖面积。结果表明全国新一代天气雷达站200 km范围内0.5°、1.45°、2.4°和3.35°仰角平均遮挡比例分别为30.7%、8.5%、2.5%和1.0%,平均有效覆盖面积分别为83210.5、109354.2、118170.9、121631.5 km2,只有少数几个雷达站受邻近山脉地形遮挡影响严重,雷达站总体有效覆盖情况较好。
Abstract:Generally, radar beam blockage caused by terrain remains unchanged for long. Research on the situation of radar terrain blockage is helpful for improving effectiveness and reliability of radar data. By using Advanced Spaceborne Thermal Emission and reflection Radiometer Global Digital Elevation Model (ASTER GDEM) terrain data, the terrain blockage of 208 existing Chinese next generation radar sites is computed. Beam blockage coefficient in a 200 km radius around radar sites is calculated at 9 observation elevation angles of Volume Coverage Pattern (VCP) modes 21. Maps of effective observation region where radar beam is not blocked are drawn while the elevation angle of radar remains at 0.5°, 1.45°, 2.4° and 3.35° respectively. The effectively covered area of radar sites is obtained according to these maps. Calculation result shows that the average blockage ratios of Chinese next generation radars within 200 km at 4 different elevation angles (0.5°, 1.45°, 2.4° and 3.35°) are 30.7%, 8.5%, 2.5% and 1.0% respectively, and the average effectively covered areas are 83210.5, 109354.2, 118170.9 and 121631.5 km2 accordingly. Most of Chinese next generation radar sites can cover the surrounding area effectively as the influence of terrain blockage remains very low except a few sites near mountains.
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基金项目:国家气象科技创新工程“气象资料质量控制及多源数据融合与再分析”攻关任务资助
引用文本:
朱丹,谷军霞,师春香,周自江,2018.新一代天气雷达布网设计的有效覆盖和地形遮挡分析[J].气象,44(11):1434-1444.
ZHU Dan,GU Junxia,SHI Chunxiang,ZHOU Zijiang,2018.Analysis of Effective Coverage and Terrain Blockage for Next Generation Radar Network Design[J].Meteor Mon,44(11):1434-1444.