Arbitrary Frequency Table Transmission Technology for a High-Power Borehole–Ground Electromagnetic Transmitter

A high-power borehole-ground electromagnetic transmitter is an important device used to detect deep metal mineral resources. This paper presents the control principle of the transmitter and the arbitrary frequency table transmission technology. The latter includes the synthesis and the predetermined time transmission of an arbitrary frequency table and a seamless frequency conversion based on an embedded system design and hardware programming technology. We used the arbitrary frequency table transmission function to reduce the impact on the transmitting system from processing the frequency conversion and achieve a smooth transition for the transmitting system when converting the high-power frequency table. These features improved the stability and the reliability of the transmitter. We also performed several field tests that support the advantages of the arbitrary frequency table transmission technology. The flexibility of the best customized transmission frequency table in the field improves the efficiency during the electromagnetic exploration and provides high-quality electromagnetic data.