电磁探测场源的复杂多频点时钟设计

A Complex Multi-frequency Synthesis Technology Applied to Electromagnetic Detecting Source

为了拓宽多功能电磁发射机的频点覆盖范围,采用VHDL分频技术和直接数字频率合成技术(DDS)相结合的频率生成技术,就可以产生复杂多频点的时钟信号,使之适用于时间域、频率域以及直流电法等领域的探测。输出信号频率范围为DC～69500Hz之间,部分占空比可调。

In order to widen the coverage area of the frequency of electromagnetic transmitter, a frequency synthesis technology is applied to electromagnetic detecting system to produce complex muhi-frequeney clock signal by combining VHDL dividing frequency technology and direct frequency synthesis technology （DDS） is adopted. Thus we can use it in time domain, frequency domain and direct current prospecting etc. The output frequency is from DC to 69500Hz, and the duty cycle of some frequency can be regulated.