基于相位补偿的高精度多路时延估计方法研究

Research on high-precision multipath delay estimation based on phase compensation

锅炉声学测温非常依赖声传播时延的估计准确性与实时性。为解决传统方法只能进行整数倍采样点数的时延估计,本文提出一种基于相位补偿的高精度多路时延估计方法,构造正弦—啁啾复合信号,结合广义二次互相关和全相位傅里叶变换的相位估计实现高精度时延估计。通过仿真和实验验证,本文构造的信号在使用广义互相关方法时的精度与其他常用信号相同,加入相位补偿后,具有更高的精度和抗噪性,精度提升8.5倍以上,且受采样频率影响不大。本文方法在使用频分复用的多路同步时延估计中的表现与单路一致的同时,将测量时间缩短至传统方法的1/8,为实现更快速更高精度的声学测温提供了有效的解决方案。

Acoustic temperature measurement of boilers relies heavily on the estimation accuracy and real-time performance of acoustic propagation time delay.To address the limitation of traditional methods,which can only estimate the delay with integer times of the sampling points,this paper proposes a high-precision multiplexed delay estimation method based on phase compensation.This method constructs a sinusoidal-chirp composite signal,and realizes high-precision delay estimation by combining generalized cross-correlation and phase estimation with the all-phase Fourier transform.Through simulation and experimental verification,the accuracy of the signal constructed in this paper matches that of other commonly used signals when using the generalized quadratic inter-correlation method.With phase compensation,it has higher accuracy and noise immunity,improving precision by more than 8.5 times,and showing minimal impact form sampling frequency.This method maintains consistent performance in multi-channel synchronous time delay estimation using frequency division multiplexing,reducing the measurement time to 1/8 of traditional methods.It provides an effective solution to achieve faster and more accurate acoustic temperature measurements.