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A novel DSSS based ToF measurement method for short baseline and its application in sound velocimeter

机译：一种基于DSSS的短基线ToF测量方法及其在声速计中的应用

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摘要

The short baseline framework is commonly used in ultrasonic parameter measurement, and ToF (time of flight) of which is essential in sound velocimeter and other applications. Different from conventional steady-state and transient methods, this paper proposed a new method using DSSS (Direct Sequence Spread Spectrum) signal to extract the ToF. DSSS signal possesses excellent auto-correlation features, thus it does not need to adjust path-length or the acoustic frequency, nor avoid the impact of the multiple echoes. The DSSS signal and measurement system are modeled and the detailed theoretical process of ToF estimation is derived to demonstrate the measurement principles, and the principles of echoes-resistance are analyzed. Measurement experiments are carried out using distilled water at ambient pressure with temperature ranging from 19°C to 30°C. The test results indicate that the relative precision of ToF is in bounds of 2 ppm and the bias of sound speed derived is within 0.06m/s compared to Del Grosso's equation.
机译：短基线框架通常用于超声参数测量，而ToF（飞行时间）在声速计和其他应用中必不可少。与传统的稳态和瞬态方法不同，本文提出了一种使用直接序列扩频（DSSS）信号提取ToF的新方法。 DSSS信号具有出色的自相关特性，因此无需调整路径长度或声频，也无需避免多重回波的影响。对DSSS信号和测量系统进行建模，推导了ToF估计的详细理论过程，以说明测量原理，并分析了抗回声原理。使用蒸馏水在环境压力和19°C至30°C的温度范围内进行测量实验。测试结果表明，与Del Grosso方程相比，ToF的相对精度在2 ppm的范围内，导出的声速偏差在0.06m / s之内。

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