自适应峰值匹配法在风速测量中的应用

介绍了超声波时差法测量风矢量的基本原理,利用测量回波信号起点求得风速。通过分析传统的时差检测方法在风速测量系统中的缺陷,提出了一种基于幅值特征提取的快速自适应波形匹配法,来克服传统方法带来的较大误差。在无风状态下,以两路波形上升段几个连续对应峰值点比例作模板,将实测回波信号所得峰值比例与模板匹配,找到正确的波形峰值对应关系,从而准确测量两波形时差。通过仿真实验测试,此法效果良好,运算速度快,克服了数据量较大时互相关法计算量大的缺点,同时计算准确性大大提高,规避了单阈值法错判的情况,结合插值法测速精度可达0.1 m/s。

Adaptive peak matching method in the ultrasonic wind speed measurement

The methods of wind speed and direction based on ultrasonic time-difference are introduced in the paper.With the time-difference between upwind and downwind,the wind speed can be detected.By analyzing the shortcomings of traditional waveform matching method,the paper proposed a fast waveform matching method based on amplitude feature extraction.Under no wind condition,made a template by the corresponding ratio of several peak points in the rising part of the two waveform.Matching the peak ratio of the echo signal with template to find the correct correspondence of the two waveform,then the time difference obtained.Simulation results show that this method works well,it has high speed,overcomes the cross correlation disadvantages of large volume calculation.And it also has high accuracy,avoids misjudgment of a single threshold value method.After waveform matching,the accuracy can reach 0.1 m/s.