Research on the Synthesis of Multi-Frequency Waveform and High Precision Synchronization Technology in Frequency Domain Electromagnetic Transmitter
As a critical component in electromagnetic exploration device, there are many issues in frequency domain electromagnetic transmitter to be addressed in the aspect of cover range of frequency points, operation efficiency under wild condition and high precision synchronization transmission as well as other aspects.The application of direct digital frequency synthesize technology (DDS) and the design of complex programmable logic device (CPLD) allow us to adjust the transmitting signal frequency of transmitter to any frequency within the range of 10kHz-0.01Hz;with the powerful logic operation capability of CPLD, a simple, reliable multi-frequency power supply wave shape with balanced power distribution is added in the basis of common frequency sweeping function, which significantly improved the operation efficiency of field electro-magnetic prospecting;the design is equipped with constant temperature crystal oscillator calibration circuit based on GPS, consequently realize the high precision synchronization transmitting and the technological support for the synchronic signal collection.It is approved in a series of sink experiments and wild experiments that the transmitting wave shape synthesized by the transmitter could fully satisfy the requirement of wild electromagnetic exploration, the frequency point is high in precision, with stable frequency and balanced multi-frequency power distribution, the transmitting synchronization error is in nanosecond class, the arrangement of dead time is rational.
frequency domain electromagnetic transmitter DDS CPLD multi-frequency waveform high precision synchronization transmission
Bo Wang Ming Deng Meng Wang Zheng Xiang Shuxiang Wang
Key Laboratory of Geo-detection, Ministry of Education,China University of Geosciences (Beijing), Beijing, China
国际会议
北京
英文
402-404
2016-06-27（万方平台首次上网日期，不代表论文的发表时间）