非接触车速仪车速误差的分析及采样时间的自适应调节

Speed Error Analysis for Non-contact Vehicle Speedometer and self-adapting Adjustment of Sampling Time

通过对车速仪测量速度的数学模型的建立，分析了动态情况下速度采样时间、距离脉冲当量与速度误差的关系，给出了速度误差的计算公式，提出了用采样时间的自适应调节，提高动态测量精度及具体应用的方法。还对各工况下的速度采样时间及误差进行了计算和比对。

By establishing mathematic model of speed measured with speedometer, relationship between sampling time, distance impulse equivalence and speed error in kinetic state is ana lysed, and it gives out calculation expression of speed error,proposes to promote kinetic measuring accuracy with self - adapting adjustment and brings up practical application method. Moreover calculation and comparison of speed sampling time and error under various working mode are made.