Terrain defilade is a key factor for early warning system (EWS) in detecting low altitude targets, effective algorithm provides the foundation of operational simulation.

地形遮蔽是影响预警探测系统发现目标能力的关键因素。有效算法是实施模拟仿真的基础。

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The current Early Warning System (EWS) for potentially damaging earthquakes has been running on several developed countries and regions and gained some successful experience.

针对潜在破坏性大地震的早期预警系统已在几个发达国家或地区运行多年，并已积累了很多成功的经验。

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