雷达测速是管状结构内运动参数测试系统的重要手段, 提高雷达工作频率可有效提高测速精确度和分辨力。在122 GHz毫米波可用性分析的基础上, 分别建立了管径和管壁粗糙度对毫米波传输的衰减常数计算模型。仿真结果表明: 随着管状结构管径的不断增大, 衰减常数趋于减小; 管壁粗糙度在5 μm内, 衰减常数急剧增大; 大于5 μm后, 衰减常数趋于平稳, 该结果进一步证明了122 GHz毫米波在身管等管状结构毫米波测速的可行性。

It is an important method of radar velocity measurement for measuring motion parameters in tubular structures. It can improve the accuracy and resolution of velocity measuring by improving the working frequency of radar. Based on the availability analysis of 122 GHz millimeter wave, the attenuation constant of pipe diameter and pipe wall roughness for millimeter wave transmission is established respectively. The simulation results show that the attenuation constant tends to decrease with the increasing of the pipe diameter. The attenuation constant tends to be stable when the tube wall roughness is larger than 5 μm; and the attenuation constant increases sharply when the tube wall roughness is less than 5 μm. This result further proves the feasibility of the speed measurement of 122 GHz millimeter wave in the tube and other tubular structures.