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线性调频相关技术在超声波测波仪中的应用大大提高了测波仪测量精度和分辨力,解决了其在大风浪或近岸破碎波的情况下测量误差过大或检测不到回波的难题.本文阐述了基于线性调频技术的超声波测波原理以及线性调频信号的设计,进行了调频信号相关性分析,并基于该技术设计了测波系统.通过模拟波浪实验对系统的性能、波浪数据的质量进行了验证,结果表明:在大风浪情况下采集到的原始数据未出现丢失现象,1/3波高的误差为5 cm.实验结果证明所研发的测波系统精确度高,适合近岸观测波浪.
The application of the LFM technology in the ultrasonic wave-measuring instrument greatly improves the measurement accuracy and resolving power of the wave-measuring instrument and solves the difficult problem of the measurement error or the undetectable echo in the case of a large storm wave or a coastal breaking wave In this paper, the principle of ultrasonic wave detection based on the chirp technique and the design of the chirp signal are described, and the correlation of the frequency modulated signal is analyzed, and the wave system is designed based on the technique.The performance of the system, the wave data The results show that the original data collected in the case of strong wind and wave do not appear to be lost, and the error of 1/3 wave height is 5 cm.The experimental results show that the developed wave system has high accuracy and is suitable for nearshore observation wave.