Analysis and design of passive super low frequency detection system

Natural source Super Low Frequency electromagnetic prospecting methods have seen an increasingly promising potential in geophysical applications. As the natural source electromagnetic signal is weak, the electromagnetic signal acquisition and processing hardware technology aiming at getting electromagnetic signals with high signal to noise ratio and data inversion accuracy is in great need. In this paper, we designeda signal processing and acquisition hardware system based on ARM platform, i.e., an embedded system, which was specific to the output signal from induction magnetic field. The FFT computation is conducted in our processor to convert time domain in to frequency domain. The relevant information is display on a LCD screen and the acquired data can be stored in storage module for further processing. The software system is based on UCOSII, and FAT32 FS, to improve operability of the system.