The Design of Digital Frequency-Shift Signal Detection Method Based on FPGA

Abstract

In this paper, the design process of a portable railway frequency shift signal detection system is introduced in detail. With the parallelism of FPGA, the multitask can be carried out simultaneously. Two channels are designed to detect the two signals simultaneously. With the help of gear switching circuit, the measurement range and measurement accuracy of the system are greatly improved. Secondly, the FIR filter bank is designed based on FPGA, the signal is filtered and analyzed, the amplitude and frequency of the signal are detected, and the detection result is displayed in real time by using LCD.