一种新的动态信道化接收机设计方法

针对复杂电磁环境中存在多个非均匀分布的、不同带宽的信号的情况,提出一种新的动态信道化接收机设计方法。设计一个半带滤波器,并通过内插运算压缩它的频率响应,形成周期频谱;对输入信号进行滤波,同时使原信号经过一定延迟后减去滤波后的信号,形成两路在频谱上互补的信号;用均匀分析滤波器组对得到的两路信号分别进行滤波分解处理,实现监视频段的均匀信道化;根据能量检测结果将属于同一信号的相邻子信道信号作为下一步重构处理的输入,并设计出相应的综合滤波器组提取信号。理论分析和仿真结果验证了新方法的有效性。

A new design of dynamic channelized receiver

Based on the fact that there exist many signals with nonuniform distributions and different bandwidths in the complicated electromagnetic environment, a new method is proposed for designing a dynamic channelized receiver. Firstly, a halfband filter is designed and its frequency response is compressed by zero-value interpolation to form periodic spectra. Secondly, the input signal is filtered with the interpolated halfband filter, and then the output of the interpolated halfband filter is subtracted from a suitably delayed version of the input signal. In this way, two channel signals whose spectra are complementary are obtained. Thirdly, the two channel signals are filtered respectively with analysis filter bank to realize the uniform channelization. Finally, according to the energy detection of sub-channels, make the outputs from adjacent sub-channels, which belong to the same signal, be the input of the synthesis section, and design the corresponding synthesis filter bank to extract the desired signal. Theory analysis and simulation results verify the validity of the new method.