声学气体测速测向方法及dsp系统的实现研究信号与信息处理专业论文.docxVIP

沈阳航空航天大学硕士学位论文摘要 沈阳航空航天大学硕士学位论文 摘要 本论文主要研究声学气体流速流向测量。对比传统测风方法，声学测量方法优势明 显，本文研究利用超声波技术实现风矢量测量，最终形成原理样机。 本论文主要包括以下几个部分： 1．声学风矢量测量方法的选取：介绍了几种超声波测风的常用方法，重点对比分析 了多普勒法测风与时差法测风。综合考虑仪器工作环境，传感器特性，系统可实现性， 噪声对测量影响等多方面的因素选取课题测量方法。 2．声学风矢量测量重点问题研究：针对超声波空气中传播特点及压电陶瓷超声传感 器的特性，选取合适的超声波传感器；对比传感器等边三角布阵技术与十字布阵技术， 根据声波传播的衰减效应，选取适合的布阵方式以及设置合理的参数；针对单阈值法测 量波形时差垃的不可靠性，文中利用一种快速峰值比例匹配方法提高测量准确性；为了 进一步提高测时分辨率，在不增加数据采集量的前提下，利用插值、匹配滤波等技术可 实现该功能。 3．基于嵌入式DSP为核心的原理样机设计：发射信号的产生设计，回波数据的滤波、 采集及信号处理算法在DSP上的实现。分析实验数据，验证原理样机的可靠性。 关键词：风速风向；时差；单阈值；峰值比例；匹配滤波 AbstractThe Abstract The topic of the paper is based on acoustic signal processing method of wind speed and direction measurement．Compared to the traditional methods of wind vector detection， acoustic measurement methods have obvious advantages．This paper studied the measurement of wind speed and direction with ultrasonic signals，and finally the prototype has been formed． The paper’S content includes the following sections： 1．The selection of wind vector measurement methods based on acoustics：This paper introduces some coinmon methods of wind speed and direction based on ultrasonic signals， the f．ocus is the comparison and analysis of the Doppler wind measurement method and time difrerence method．Considering the working environment instrument，sensor characteristics， the svstem can be realized．Noise on the measurement and other various factors that impact the measurement，the paper finds proper methods to resolve them· 2．The kev issues of wind Vector measurement based on acoustics：for the features of airbome ultrasonic and the characteristics of piezoelectric ultrasonic sensor，this paper introduces how to select the appropriate ultrasonic sensors．The paper made a contrast between equilateral triangular technology and cross—lineup technology,according to the attenuation of sound wave propagation，the paper selects the appropriate way to embattle and set reasonable parameters，for the unreliability of single threshold value method in time diff-erence At metho