A Complex Multi-frequency Synthesis Technology Applied to Electromagnetic Detecting Source
Xie Pin-fang · Electrical Measurement & Instrumentation · 2009
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 multi-frequency 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.