声呐信号传输时间测量方法与系统

提出了一种新的高精度测量声呐信号传输时间的方法和系统,该方法利用双GPS精确授时模块实现声呐信号发射和接收同步。测量系统采用声呐接收和发射模块分立结构,接收模块直接接收发射模块的声波信号,通过声呐信号发射和接收的时间差来测定声呐信号的传输时间。这种方法解决了传统测试方法中因障碍物使回波发生畸变而导致的测量误差较大的问题。系统采用C8051F020单片机控制声呐信号的接收,利用可擦写可编程逻辑器件(EPLD)测定信号传输的时间。实验结果表明:系统工作稳定可靠,测量精度高,可以达到5~8μs。

Measuring method and system for sonar signal transmission time

A new method and system for high precision measurement of sonar signal transmission time is presented.With double GPS high precision timing module,the method can realize the emission and receiving synchronization of the sonar signal.And in this measuring system,by employing the structure of separate emission module and receiving module,the receiving module can receive the acoustic signal directly and the transmission time can be measured precisely through the time difference of the emission and the receiving sonar signal.The proposed method can overcome the problem of big measurement errors produced by distorted echo signal because of obstacle in the traditional measuring method.Applying MCU C8051F020,the system can control the receiving of the sonar signal and measure the transmission time via programmable logic device(PLD).The experiment results show that the system has a stable performance and high measurement precision up to 5~8 μs.