The Whole Zone Apparent Resistivity Calculation Method of Encoded Source Electromagnetic Sounding
The encoded source electromagnetic sounding method based on circular correlation identification and the calculation method of whole zone apparent resistivity are put forward.Using the inverse repeated M sequence as the excitation signal, the encoded current from the source is through the grounded electrodes of horizontal electric dipole, the electric field with the same horizontal direction of the transmitter dipole or the vertical magnetic field is measured in the equatorial array.The excitation current and the received electric voltage signal or the vertical magnetic field are simultaneously recorded in the time series at the sampling rate using the same acquisition equipment, and using circular cross-correlation method to obtain the earth frequency response, then the whole zone apparent resistivity spectrum are calculated according to the frequency response and measurement parameters of the electromagnetic sounding array.The results show that the encoded source electromagnetic sounding based on circular cross-correlation method to obtain the whole zone apparent resistivity spectrum, raises the efficiency of electromagnetic sounding and improve the whole zone apparent resistivity frequency resolution, and due to the adoption of the circular cross-correlation method and the current signal of inverse repeated M sequence is an even multiple of power frequency, can effectively suppress the power frequency interference, so this method has enhanced anti-jamming ability.
encoded source electromagnetic sounding circular cross correlation Whole zone apparent resistivity frequency response inverse repeated M-sequence
Weibing Luo Haitao Han Mei Li Jingtian Tang
Gansu Nonferrous Geological Survey Institute LanZhou, China School of Information Engineering, University of Geosciences (Beijing)BeiJing, China School of Geosciences and Info-Physics, Central South University ChangSha, China
国际会议
北京
英文
73-76
2016-06-27（万方平台首次上网日期，不代表论文的发表时间）