基于FPGA的固定频率车辆检测器

Frequency-fixed vehicle detector based on FPGA

频率固定车辆检测技术可以显著降低因相邻车道干扰而导致的检测错误。利用精密模拟调理器、DDS、FPGA等技术实现了频率、灵敏度可调的高灵敏度、高可靠性车辆检测系统。实际测试表明,系统可以在10ms内对线圈电惑量0．02％的变化作出响应,从而为检测线圈感抗变化提供了一个有效的手段。

Frequency.fixed vehicle detecting technology can reduce detecting error caused by interference from other ddveway reroarkably. Utilizing precise＇ analog conditioner, direct digital synthesizer （DDS）. field programmable gate array （FPGA）, a frequency and sensitivity adjustable, high sensitive and high dependable vehicle detector is presented in this paper. Actual test shows that a 0.02% change of coil inductor can be detected within 10ms by this detector. So a new efficient technology in coil inductor detecting is provided.