基于锁相环技术的高灵敏车辆探测

Design of sensitive vehicle detection base on PLL

针对交通系统中十字路口处车辆的分道行驶管理,提出一种利用锁相环技术提高感测装置灵敏度及抗干扰能力的设计方案。该设计方案通过检测锁相环失锁来判定是否有车量经过,具有自我调节能力,不会因为周围电磁环境的改变导致中心频率偏移而失效,可有效实现探测车辆违规越道行为。实验结果证明,该设计方案的成本低,具有广泛的应用前景。

Aiming at the vehicle steering in defferent line management in crossroad,a design of vehicle detection based on phase-locked loop （PLL） is provided.The design can improve the sensitivity and enhance the ability of the detection device. The design can detect vehicles by PLL, and has oneself adjustable ability.So the center frequency defletion is not invalid when environment is changing.This design has obvious effect in improving sensitiveness.The experiment results the design is available, low cost .It has a very widely application prospect.