混响室机械搅拌工作方式下独立采样点计算建模

A Model for the Number of Independent Samples in Reverberation Chambers with Mechanical Stirring

通过理论分析,确定机械搅拌工作方式下混响室体积、搅拌器体积、工作频率等因素对混响室独立采样点数的影响,推导出混响室独立采样点数的近似计算公式。在实验室混响室中进行多个频点测试,通过矢量网络分析仪测得的S21参数对混响室不同工作频点下的Q值进行分析。运用自相关函数法计算不同工作频点对应的真实独立采样点数,代入模型对模型进行验证和改进。利用修正后的计算模型计算不同工作频点下混响室的独立采样点数,将计算结果与实验测算结果进行比较。结果表明构建的模型计算结果与实测结果相符,精度较高。

This report aims to determine the impact of the factors such as volume of reverberation chamber,volume of stirrers,experimental frequency etc on the number of independent samples though theoretical analysis.With theoretical derivation,simple formulas for the number of independent samples of a reverberation chamber are presented.Multiple experiments in different frequencies were taken in the reverberation chamber,The Q values of the reverberation chamber in different frequencies were calculated though the S21 parameters measured by the vector network analyzer and the independent sampling points of reverberation chamber can be calculated though ACF（autocorrelation function）.According to the calculation results,the validation and improvement was made on the model.The calculated independent sampling points can be obtained though the modified model.Comparing the experimental results with the calculated results,the exported model matches the experiments very well and the calculated results are precise can be concluded.