风速风向仪设计中互谱插值算法的应用

摘要

In order to solve the problems of the low measurement sensitivity of traditional anemometer, a new method based on the ultrasonic transit-time wind speed measurement was proposed. The cross-correlation algorithm was used to estimate the transit time difference, and to improve the estimation accuracy by cross-spectral interpolation. Results showed that com-pared with the cross-correlation algorithm, cross-spectral interpolation algorithm had more accurate delay estimation. According to the characteristics of FPGA device, the design of the entire measurement system were achieved with the use of Verilog HDL language programming, top-down design methods.%为解决传统风速风向仪测量精度不高的问题，设计了一种基于时差法的超声波风速测量仪。利用互相关算法实现超声波渡越时间差估计，并通过互谱插值来提高估计精度，仿真结果表明，与互相关算法相比，互谱插值算法对时间差的估计精度更高。根据FPGA器件特性，运用Verilog HDL语言编程，采用自顶向下的设计方法，实现了整个测量系统的设计。