This letter presents a practical method for identifying the resonance frequencies of arbitrary complex cavity within the reverberation chamber (RC). Based on a sufficient set of independent samples, the permutation entropy (PE) algorithm is used to determine the resonance frequency. For this method, the relevant parameters and regularity indicators have been defined, and the corresponding results are verified experimentally from different configurations of unloaded and loaded cavities.

中文翻译：

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一种简单有效的混响室内复杂腔体共振频率识别方法

这封信提出了一种用于识别混响室 (RC) 内任意复杂腔体共振频率的实用方法。基于足够的独立样本集，使用置换熵 (PE) 算法来确定共振频率。对于该方法，已经定义了相关参数和规律性指标，并从空腔和加载腔的不同配置对相应结果进行了实验验证。