混响室频率搅拌方式及其场环境特性分析

从本征模的角度阐明了频率搅拌技术的混响原理，并根据激励信号的频域特征，系统研究了频率搅拌方式下获取实时均匀场与统计均匀场的三种有效实现途径。选取线性扫频这一搅拌方式为主要研究对象，检验了混响室频率搅拌下的最低可用频率、场均匀性与统计特性三项主要技术指标。试验结果表明：线性扫频搅拌方式下，混响室的最低可用频域与机械搅拌方式基本一致；场均匀性满足IEC 61000-4-21标准规定的容差要求；场值波动规律符合理论分布模型。

Frequency stirring method and field characteristics analysis in reverberation chamber

The theory of frequency stirred RC is illustrated from the perspective of eigenmodes. According to the frequency domain characteristics of the radiation signal, three effective frequency stirring approaches which can achieve real-time uniform and statistical uniform field environments are systematically researched. A linear sweep signal is selected as the major research object to perform a comprehensive test of the various technical index of frequency stirring RC, including the lowest usable frequency, filed uniformity and statistical properties. The test results prove that the lowest usable frequency in frequency stirring mode is consistent with mechanical stirring, the field uniformity satisfies the tolerance requirement in IEC 61000-4-21 standards, and the electric field obeys the theoretical distribution.