Experiments of rock fracture verified that strong low frequency wave could be received both on the surface of rocks and in the air before the main fracture.
岩石破裂实验证实主破裂前在岩石表面和空气中均收到较强的低频波。
High frequency surface wave radar is an important tool of the over horizon detection of sea and low-altitude targets.
高频地波雷达是对海面、低空目标进行超视距探测的重要手段。
High frequency surface wave radar is an important tool of the over horizon detection of sea and low-altitude targets.
高频地波雷达是对海面、低空目标进行超视距探测的重要手段。
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