High Alphabet modulation is a new modulation method, which is very suitable for safety remote control aboard missile, launch vehicle, manned or unmanned spacecraft, etc.

主字母调制技术是一种新颖的调制方式，非常适合于导弹、运载火箭以及载人和不载人飞船的安全遥控。

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An L-band safety remote control system is introduced which is composed of three stations and one center in order to increase coverage and overcome the limit of earth curvature to intervisibility.

本文介绍一种L频段安控系统，它由“三站一中心”组成，用三站无线接力的方法来提高覆盖范围并解决地球曲率对通视的限制。

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By using video cameras, these systems real-time monitor the target scenes, sending the captured video data to the remote display so as to accomplish effective safety control.

其利用摄像头对目标场景进行实时监控，并将采集获取的视频数据呈现在远程显示设备上，用以实施有效的安全控制。

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