The Design of Pseudo-random Signal Transmitting Electromagnetic Detection System Based on FPGA

In order to overcome the shortcomings of the single transmission frequency and poor anti-interference ability of traditional geological exploration systems, this article designs a pseudo-random signal transmitting electromagnetic launch system based on the highly integrated, convenient, and flexible design characteristics of field programmable gate array (FPGA). Using linear feedback shift register (LFSR) and technology of direct digital frequency synthesis (DDS), the output signal has a random frequency, and it can effectively avoid the influence of the outside electromagnetic interferences which are difficult to remove in the past, and can increase the noise ratio in a low power to get satisfactory results. At the same time, it can transmit signals of multiple different frequencies in one power supply to improve the detection efficiency. It’s suitable for the exploration and development of our multi-mountain mineral.