无线温度检测中的频率信号处理  

Frequency Signal Processing in Wireless Temperature Detection

作　　者：孙鹏[1] 张福才[1] 

机构地区：[1]黑龙江科技大学电气与控制工程学院,黑龙江哈尔滨150022

出　　处：《自动化仪表》2014年第10期84-86,共3页Process Automation Instrumentation

基　　金：黑龙江省教育厅科技研究基金资助项目(编号:12521487)

摘　　要：针对传统方法难以检测传感器大范围频率偏移信号的问题,采用扩频技术解决这一问题。考虑无线温度检测以不同切型的晶体为核心、以超声波信号为载体,为设计出适合不同晶体特性、检测精度高、通用性强的检测仪表,对超声回波信号检测方式进行了改进,提出采用扩频技术中的分段匹配滤波进行传感器频率信号处理。经仿真证明,它可以有效保证超声波收发双方的同步,准确测出超声回波频率偏移值,可以推广用于其他需要频偏信号检测的场合。The wide range frequency offset of the sensor signals is difficult to be detected by traditional methods ; this problem can be solved byadopting spread spectrum technology. Considering the crystal with different cutting type is the core of wireless temperature detection, andultrasonic signal is the carrier, in order to design high precision and versatile detectors suitable for different crystal characteristics, it isnecessary to improve the detection method for the ultrasonic echo signal. The frequency signal processing method for sensor by using segmentedmatched filtering in spread spectrum technology is proposed. The simulation proves that it effectively ensures the synchronization of both sendingand receiving, to accurately measure the frequency offset of ultrasonic echo, thus it can be promoted to other applications requesting frequencyoffset signal detection.

关 键 词：水晶晶体 频率偏移 超声波 扩频 分段匹配滤波 

分 类 号：TP873.1[自动化与计算机技术—检测技术与自动化装置]