Wideband Digital Receiver And Signal Processing Technology

Radar countering is one of most important parts of electronic warfare. Radar reconnaissance is the basis and prerequisite for the implementation of radar counter. Radar reconnaissance system can be classified as receiver subsystem and signal processing subsystem according to different functions.For the receiver subsystem, the wideband digital receivers of two architectures: zero intermediate frequency sampling architecture and IF sampling architecture are discussed in this paper. For the former, through combining the superheterodyne method and the quadrature mixing frequency method, the wideband reception and mirror frequency suppression can be implemented by Secondary frequency conversion technology. For the latter, the bandpass sampling theory and the digital channel method based on uniform poly-phase filters matrix are described in the paper.For the signal processing subsystem, I mainly focus on its two key technologies: the signals sorting and the analysis of pulse modulation.Applying the research achievement in the field of artificial neural network, the paper describes signal sorting algorithm based on Fuzzy ART method in detail at first, and then makes improvements on the existing algorithms and simulates them to verify the effect. In end of this chapter, the detail of the realizing process is introduced of the signal sorting algorithm in the research project.For the analysis of pulse modulation signals, the paper first describes three methods of identifying typical features of intra-pulse modulation of signals, and then focuses the principle of phase difference method and the implementation steps.Finally, the design of the signal processing subsystem which is used in the research projectis is discussed briefly.