Design of Frequency Adjustable Pulse in Intelligent Electronic Fence System

Abstract

In the intelligent electronic fence system, in order to reduce the blind area of pulse detection and adapt to different transmission distance, based on low-voltage pulse ranging method, direct digital frequency synthesis technology is used to synthesize and simulate the circuit and burn it to FPGA chip through Quartus II platform. The rectangular pulse signal is output by digital-analog converter circuit and low-pass filter circuit. The experimental results show that 16 kinds of frequency adjustable rectangular pulse signals are generated by this method, which can effectively reduce the blind area of measurement and enhance the adaptability.