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下视雷达的射线路径与临界视在俯角有关 ,而临界视在俯角又与低层大气折射剖面有关。文中利用实测低层大气折射指数剖面与全国平均大气模型对下视雷达的临界俯角与高度的关系进行分析 ,并利用实测地面大气折射率通过指数大气模型对下视雷达的临界视在俯角进行预测 ,同时也给出预测精度。
The ray path of the down-looking radar is related to the critical apparent depression, while the critical apparent depression is related to the refraction profile of the lower atmosphere. In this paper, the relationship between the critical depression angle and the altitude of the down-looking radar is analyzed by using the measured low-level atmospheric refractive index profile and the national mean atmospheric model. The critical apparent depression angle of the under-lying radar is predicted by the exponential atmospheric model with the measured atmospheric refractive index. Also gives the prediction accuracy.