The master control chip uses AT89C51, the communication mode adopts DTMF signal with strong anti-interference and high reliability, and simplex frequency modulation.
主控芯片采用AT89C51单片机，通信方式采用抗干扰能力强、可靠性高的DTMF信号和单工调频的无线通信方式。
Characterized by strong anti-interference capacity, high resolution ratio and portability of the instrument, the dual frequency gradient method has proved effective in practice.
双频梯度测量法有抗干扰能力强、分辨率高、仪器轻便等特点，实践证明应用效果很好。
The node hardware circuit design, PCB making and a number of anti-interference measures taken in the high-frequency mixed circuits is described in detail in the paper.
论文对节点硬件电路原理、设计方法、PCB制做以及数模混合高频电路中的抗干扰措施进行了深入研究。
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