伪随机序列在声学测温中的应用研究  

Study on the application of the PRBS in acoustic pyrometry

作　　者：李科[1] 安连锁[1] 沈国清[1] 张波[1] 

机构地区：[1]华北电力大学电站设备状态监测与控制教育部重点实验室,北京102206

出　　处：《华北电力大学学报（自然科学版）》2007年第6期47-50,56,共5页Journal of North China Electric Power University：Natural Science Edition

基　　金：教育部高等学校博士学科点专项科研基金(20050079004)

摘　　要：声学测温技术中声源信号选择是准确测量声波飞渡时间的关键。基于Matlab平台,编程制取m序列和扫频信号,进行了互相关特性、抗噪性能仿真比较;并在实验室加背景噪声的条件下,对两种信号的声波时间延迟估计进行了实验研究。仿真和实验结果表明:由于伪随机信号具有二值自相关性,比扫频信号具有更高的准确性、稳定性和抗干扰性能,可以进一步提高声学测温的精度。Selection of the sound signal is the key to measure time delay and reduce error in the acoustic pyrometry system, In this paper, the pseudo-random binary sequence （PRBS） and the chirp signal were simulated on Matlab to re,search the quality of correlation and anti-noise, The time-delay estimation of the PRBS and chirp signal was experimented in the noisy condition. The results show that the PRBS signal has better precision, stability, and quantity of anti-noisy than the chirp signal, which is more proper to be used as the measuring signal with the property of 2-value in the correlation function.

关 键 词：声学测温 互相关函数 伪随机序列 扫频信号 时间延迟估计 

分 类 号：TK311[动力工程及工程热物理—热能工程]