Design and Application of Semi-aircraft Electromagnetic Receiving System
When using the semi aerial electromagnetic method for exploration,the voltage signal obtained by the coil sensor in the semi aerial electromagnetic receiving system is very small and susceptible to interference from factors such as noise,making it difficult to directly sample and analyze.A new type of low noise semi aerial electromagnetic receiving system was designed to address the above issues.The system designed a low noise amplification circuit with dual channel matching transistors MAT03,MAT12,and a low noise amplifier AD8429 as the core,and a fifth order low-pass filtering circuit with operational amplifier NE5532 as the core.The feasibility of designing circuit functions was verified through simulation,and performance testing and field experiments were conducted on it.The test and experimental results show that the designed amplification circuit has adjusta-ble gain and lower noise than commercially available amplifiers,and the low-pass filtering circuit has good suppression effect on high-frequency interference.
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