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[1] Tang Huiqiang, Huang Weiyi, Li Ping, Lü Qinghua, et al. Ultrasonic wind velocity measurement based on DSP [J]. Journal of Southeast University (English Edition), 2005, 21 (1): 20-23. [doi:10.3969/j.issn.1003-7985.2005.01.005]
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Ultrasonic wind velocity measurement based on DSP()
基于DSP的超声风速测量
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Journal of Southeast University (English Edition)[ISSN:1003-7985/CN:32-1325/N]

Volumn:
21
Issue:
2005 1
Page:
20-23
Research Field:
Automation
Publishing date:
2005-03-30

Info

Title:
Ultrasonic wind velocity measurement based on DSP
基于DSP的超声风速测量
Author(s):
Tang Huiqiang1;  Huang Weiyi2;  Li Ping1;  Lü Qinghua1
1 Department of Information Engineering, Nanjing University of Information Science and Technology, Nanjing 210044, China
2 Department of Instrument Science and Technology, Southeast University, Nanjing 210096, China
唐慧强1;  黄惟一2;  李萍1;  吕清华1
1南京信息工程大学信息工程系, 南京 210044; 2东南大学仪器科学与工程系, 南京 210096
Keywords:
ultrasonics;  IIR(infinitive impulse response)filter;  DSP(digital signal processing);  wind velocity
超声波;  IIR滤波器;  DSP;  风速
PACS:
TP274+.5
DOI:
10.3969/j.issn.1003-7985.2005.01.005
Abstract:
Ultrasonic transmitting, receiving and amplifying circuits are designed.The received signals are sampled with the high speed ADC(analog-to-digital converter), and dealt with the DSP(digital signal processing).A forward-backward IIR(infinitive impulse response)filter with no delay is designed to filter the sampled data, and series A and B are achieved by narrow and wide band filtering, respectively.In series A, the start point of the cycle first exceeding the threshold is calculated accurately by interpolation, and the start cycle is detected by fitting cycles in series A and its inversion A′ to cycles in B with variance analysis.Therefore, the start point of the start cycle is calculated precisely.By deriving the relationships between the travel time in the opposite directions of three axes and the airflow velocities, the wind velocity and direction are calculated.Experiments show that the reliability and the precision are improved, and the circuits are simplified.
设计了超声波发射、接收、放大等电路, 采用高速A/D转换器采集超声波接收信号, 利用DSP进行数据处理.设计IIR带通滤波器对采集信号进行前后向滤波以消除延迟, 通过窄带及宽带滤波分别取得序列A与B.利用序列A通过插值取得首先超过阈值的某一周期的精确起始时间, 通过序列A及反相序列A′分别与序列B的对应周期进行方差分析, 利用假设检验来识别接收波形的起始周期, 从而求出超声波的传输时间.通过超声波在三坐标轴向来回的传输时间与空气流速间的关系, 求出三维风速与风向.结果表明, 测量可靠性及精度得到提高, 电路设计也得到简化.

References:

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[2] Sabatini A M.A digital signal-processing technique for compensating ultrasonic sensors[J].IEEE Transactions on Instrument and Measurement, 1995, 44(4):869-874.
[3] Parilla M, Anaya J J, Fritsch C.Digital signal processing for high accuracy ultrasonic range measurements[J].IEEE Transactions on Instrument and Measurement, 1991, 40(4):759-763.
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[5] Zhu Shiming, Liu Zhengqing, Wei Moai.The zero crossing digital average measurement method to increase measurement accuracy [J].Chinese Sound Technology, 1990, 9(3):36-39.(in Chinese)
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Memo

Memo:
Biography: Tang Huiqiang(1965—), male, doctor, associate professor, thq@jlonline.com.
Last Update: 2005-03-20