地面导线环是变频测深发射天线的一种形式。
The wire loop laid on the ground is one type of antenna for parametric depth sounding.
把电离层和地面想象成电池的两极。 用一根导线连接这两极的话，电流就会流动，然后就会产生火花。
Think of the ionosphere and the ground as the terminals on the battery and you put a wire between those two terminals and current flows, and literally you get a spark.
结合测量经验，探讨了用GPS与EDM导线建立小水电工程地面控制网的方法，并以实例加以介绍。
Combined with survey experience, the author probed into the methods of setting up ground control net with GPS and EDM lead for small hydropower projects based on the introduction of practice examples.
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