ground signal meaning in English

地上标志
面信号

Its signal is much weaker than the back ground signals so that it hardly affects the back ground system . therefore , soct is very useful not only in raising channel efficiency , but also in building a hidden communication system for military purpose
由于它的信号比原信号要微弱得多而不影响原信号的传输，因此这种技术不仅可以用于提高卫星信道的利用率，而且可以用于实现一种非常隐蔽的军事保密通信方式。
It introduces that high - frequency data acquisition method bases on the common gpib bus . to data acquisition based on pc - daq , it makes theoretical analysis in signal - processing grounded signal source and measurement , data acquisition principle . avoiding pseudo - signal and multi data acquisition etc . . .
一个完整的基于gpib总线接口系统主要由带gpib接口的测试设备、 gpib卡以及电缆和计算机组成。在本章中介绍了基于gpib接口总线的特点，着重说明了gpib总线接口系统的原理和方法并给出了源代码。