基于广义互相关理论的风速测量算法研究.docVIP

基于广义互相关理论的风速测量算法研究 ,1. 沈阳航空航天大学 电子信息工程学院, 辽宁 沈阳 110136, 2. 中国科学院声学研究所 综合声纳实验室, 北京 100080, 3. 北京航瑞博泰科技有限公司 北京 100102, 摘要, 由于超声波时差法测风速对于时间测量要求很高,0.1 m/s速 度精度时差 Δt 仅为 400 ns,这就需要很高的采样 率和大的系统存储空间。 将时差 Δt 的测量分为“粗测”、“细测”两部分,用插值相关的办法可以有效解决这个问题。 插 值后通过传统互相关法可准确测量时差 Δt “”,,的细测部分然而这种方法只有在平稳噪声环境下效果较好局限性较 ,实际测量中结果误差较大。 为了克服这问题,通过广义互相关算法,GCC,可提高这部分时差测量的准确性。 广义 大 ,提高了信号频谱特性,抑制了噪声对测量的影响。 实验结果表明,广义互 互相关法将回波信号在频域进行加权处理 ,测量准确性大大提高。 相关算法在白噪声以及有色噪声中都有很好的效果 关键词, 时间延迟估计, 有色噪声, 广义互相关, 加权 :1674,6236,2011文章编号--中图分类号, TN98 文献标识码, A Researchon arithmetic of wind-metering basedon generalized crosscorrelation 1231ZHANG Ha,o LIU Ji-yuan, JIAO Xue-fen,g WANGJ ing ,1. Electronics andI nformation Engineering, Shenyang AerospacUnivee rsity, Shenyang 1101,3 6China, 2. Institute of Acoustics, Chinese Academy oSfc ience, Beijing 10008,0 China, 3. Beng HangRuBoTa ScenceTechnoogy Co., Ltd, Beng 10010,2 Chna, ijiiiilijii Abstract: The method owif nd speed andd irection based on ultrasontiic me -difference neededt ime detect veryacc urate , when thew nd speed s 0.1m/s, the tme-difference between two wavefosr monly s 400ns. This requires a shamigph ng iiiili rate and arge system storage spaceso. vTe ot his probem , it divded the tme differencen to two parts , “coarsed etected” llliii and “fine test”, then daelt the waveformwi th interpolation and crossco rrelation. After the waveformins te rpolated , t he traditona crossc orreaton obtaned correctd ifference , but this method hads gan ifcant mtaton , it workedw e only in illiiiiliiillstationary noise, error results often appeainr eadc tual measuremenInt. order to overcomtheis weak opint , this paperus ed the generalized crossc orrelation ,GCC, to realize this part oft ime-difference detected ocrrectly. With echos ignal weighted in the frequency daonm, generazed crossc orreaton mproved the spectra characterstcs , nhibted the mpact of ililiiliiiiimeasurement inseo. Experimental results show that GCis Cw ell used iether in stationary noise or co