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路面雷达是路面结构层厚度检测的主要手段之一,国内应用较为广泛,但有关路面厚度检测精度的实际研究较少。文章从雷达工作原理出发,介绍并比较了两种常用计算电磁波在介质中传播速度的方法,结果表明,反算平均速度的方法更适用于路面结构层厚度检测。此外,还分析了雷达天线类型对探测深度和精度的影响,并对介电常数取值对检测精度的影响进行探讨,给出了误差估计的计算公式,为检测结果精度的评价提供依据。
Pavement radar is one of the main means to measure the thickness of pavement structure layer. It has a wide range of applications in China, but there are few practical researches on pavement thickness detection accuracy. Based on the working principle of radar, this paper introduces and compares two commonly used methods for calculating the propagation velocity of electromagnetic waves in a medium. The results show that the method of calculating the average velocity is more suitable for the thickness measurement of pavement structure. In addition, the influence of the radar antenna type on the detection depth and accuracy is also analyzed. The influence of the dielectric constant on the detection accuracy is also discussed. The calculation formula of the error estimation is provided, which provides the basis for the evaluation of the detection accuracy.