基于同步姿态测量的地空三分量电磁接收系统设计

针对地空三分量电磁探测对接收信号高速、同步、大量存储、同时记录线圈姿态信息的需求,提出了带有高精度同步姿态测量的全波形地空电磁探测数字接收系统。设计了针对地空电磁法的模拟信号调理电路,通过两片同步驱动的高速24位AD芯片实现三通道高速采样,由FPGA实现了大量数据的实时传输。设计了同步姿态测量装置,可实时同步存储线圈姿态数据。实测结果表示,该数字采集系统能满足三个通道全速192 k Hz的采样率采集电磁数据、以100 Hz的采样率得到同步的线圈姿态数据,并通过实地野外实验证明了该系统可以完成含姿态测量的地空电磁三分量数据采集工作。

Design of Three-component Ground-airborne Electromagnetic Receiving System Based on Synchronous Attitude Measurement

In order to meet the requirements of high speed, synchronization, large amount of storage and simultaneous recording of attitude information, an all waveform digital receiving system with high precision synchronous attitude measurement is proposed. The analog signal conditioning circuit for the ground-airborne electromagnetic method is designed. Three-channel high-speed sampling is achieved through 2 high-speed 24-bit ADC driven by synchronous pieces. The real-time transmission of a large amount of data is achieved by FPGA. The synchronous attitude measurement device is designed, and the coil attitude data can be stored in real-time. The measured results show that the digital acquisition system can meet the requirements of the three-channel full-speed 192kHz sampling rate to collect the electromagnetic data, and obtain the synchronous coil attitude data with the sampling rate of 100Hz. The field experiments proved that the system can complete the acquisition and correction of the ground-to-air electromagnetic three-component data with attitude measurement.