基于LMS自适应时延估计和FPGA的超声波测风系统研究

利用超声波传感器进行风速测量时,温度对超声波传播有很大影响,时延估计对超声波测风系统的精度起到很大的作用。本超声波测风系统为避免温度对风速测量中的影响,采用了基于时差法的测量原理,为了提高时延估计值的精度,提出了基于最小均方(LMS)自适应时延估计的测量方法,研制了以单片机Atmega128和现场可编程门阵列(FPGA)为核心的硬件系统。仿真和实际测试的结果表明,该超声波测风系统的时延估计值精确度较高,具有很高的应用价值。

The ultrasonic wind measurement system based on LMS adaptive time delay estimation algorithm and FPGA

In the case of application of ultrasonic sensor for wind speed measurement, the temperature has an important influence on ultrasonic propagation, and the time delay plays a vital role in the system of ultrasonic wind speed measurement. The method based on Least Mean Square (LMS) adaptive time delay estimation algorithm is proposed to gain higher precision, a hardware system consists of Microprocessor Atmega128 and Field Programmable Gate Array (FPGA) is completed. Finally, the simulation and measurement results show that the time delay estimation has a higher accuracy and the system of ultrasonic wind measurement has higher application value.