无线温度检测中的频率信号处理

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 by adopting spread spectrum technology. Considering the crystal with different cutting type is the core of wireless temperature detection, and ultrasonic signal is the carrier, in order to design high precision and versatile detectors suitable for different crystal characteristics, it is necessary to improve the detection method for the ultrasonic echo signal. The frequency signal processing method for sensor by using segmented matched filtering in spread spectrum technology is proposed. The simulation proves that it effectively ensures the synchronization of both sending and receiving, to accurately measure the frequency offset of ultrasonic echo, thus it can be promoted to other applications requesting frequency offset signal detection.