(中南大学信息科学与工程学院) 摘要:本文在宽带数字信道化接收机通常采用多相滤波器组结构和 STFT 结构方法实现信道 化的基础上,推导了利用多相 STFT 结构实现信道化接收的方法。多相 STFT 结构将多相结构 与 STFT 结构结合起来,利用多相结构降低数据处理速率,采用 STFT 实现信道化。采用该方 法实现数字信道化时,接收机时频分辨能力强,占用硬件资源少,非常适用于信道数较多的 数字信道化接收机的设计。 关键词:多相滤波器;STFT;数字信道化接收机 中图分类号:TN 911 analysis of STFT digital channelized receiver based on polyphase structure HE Libin, WANG Guocai (School of Information Science and Engineering, Central South University) Abstract: In this paper, based on the channelized method of polyphase filter bank structure and STFT structure that wideband digital channelized receiver usually adopts, multiphase STFT structure is deduced. Multiphase STFT bines multiphase structure and STFT structure together, uses multiphase structure to reduce the data rate and STFT structure to realize channelization. Digital channelized receiver has good time-frequency resolution ability, occupies less hardware resources when the channelized method of multiphase STFT structure is used. The method is very suitable for the digital channelized receiver which has a large number of channels. Key words: polyphase filter;STFT;channelized digital receiver 0 引言 现代通讯、电子侦察要求接收机具有宽输入带宽、高分辨率和大动态范围,同时能对到 达的多信号进行接收并具有低响应时间等能力。这样的接收机需要用一个搜索或监视信号的 专业设备对整个频段进行搜索监视,以确定在哪个信道上出现了信号,如果用作搜索或监视 的接收机搜索速度不够快,就会遗漏或者丢失信号从而产生漏警,无法进行全概率信号截获。 随着现代电子侦察技术的不