Research On Efficient Channelization Technology For Radar Signal

With the continuous application of communication technology in the communication countermeasure area,the signal environment has become more and more complex.Digital channelization technology is conducive to a variety of processing such as detection and interception of signals in a complex signal environment.As a key technology of software radio,it can process different frequency components in the input signal separately,so as to extract subband signals for subsequent processing.In this thesis,the channelization analysis and synthesis module is applied to a digital radio frequency memory system,in order to perform different types of modulation processing on the signal in the middle part of the channelization structure,and finally achieve accurate interference effects.This thesis studies the structure of digital channelization and digital radio frequency memory system.The main contents are as follows:The basic theory related to digital channelization technology and wideband signal processing is elaborated in detail.The mathematical principles and efficient implementation structure of multi-rate signal processing and digital filter banks are deduced.The structural theory of digital down conversion is introduced.Considering the shortcomings of the general down-conversion technology in practical application,a suitable parallel down-conversion structure for radar signals is implemented.As a front-end processing part,it can effectively reduce the system processing rate,thereby relaxing the restrictions on digital processing devices.The specific design scheme of the efficient digital channelization structure for radar signals and the clear analysis of each module are given.After combining the frequency response masking technology and the channelization technology,the analysis and synthesis module of the channelization structure is designed by using the way of parity separation.The structure is optimized without affecting the reconstruction effect,and polyphase decomposition and identity structure are used to simplify the filter.Simulation results show that the optimized structure reduces the overall computational complexity and resource occupancy,enhances design flexibility and real-time signal processing capabilities.It is not only suitable for mixed signals with different bandwidths,but also significantly improves the reconstruction performance.The general implementation principle and specific structure of DRFM technology are researched,and a design scheme of DRFM system based on the researched channelization structure is proposed,and the precise interference of radar signals is realized through the approximately reconstructed channelization structure.It turns out that the structure can not only reduce the signal processing rate,but also realize different interference modulation processing for different components in the signal at the same time,thereby generating a flexible interference signal.The DRFM system can effectively separate multiple signals arriving at the same time,it can realize broadband reception of signals and real-time processing,which greatly improves the effectiveness of interference.