结合实践经验，详细介绍了雷达等射束高度图（也称为雷达有效地理视距图）制作的原理和方法。

The drawing method and principle of radar chart with iso beam height (radar range chart) were described based on the practical experience.

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“作战幸存者/逃逸者定位器”为军事人员提供精确的地理定位信息和安全，超视距（OTH）和视距（LOS）双向数据通信能力。

CSEL provides military personnel with precise geo-positioning information and secure, over-the-horizon (OTH) and line-of-sight (LOS) two-way data communications capabilities.

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