In the article, the detecting principle is discussed, the specific hardware implement circuit and software designing are given and the system is proved by experiment.
文中讨论了系统的检测原理，给出了具体的硬件实现电路、软件设计，并对系统进行了实验验证。
Implement the hardware circuit.
电路的硬件实现。
Mainly introduced hardware design of the measuring circuit. It included used CPLD to implement the direction circuit and count circuit.
详细叙述了测量电路的硬件设计，主要包括方向识别电路与计数电路的CPLD实现，以及部分程序的设计。
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