Research On Channelization Detection And Acquisition Of Radar Signal And Its Realization Method Based On WOLA Filter Bank

Digital channelization technology has the advantages of large instantaneous processing bandwidth,full-band reception,reduced data rate and improved signal-to-noise ratio.It is often used in radar signal detection and collection systems.The existing digital channelization technology generally adopts a fixed structure,and cross-channel phenomena often occurs during detecting and receiving signals in a complex reconnaissance environment,making it difficult to distinguish cross-channel signals.The existing cross-channel signal processing method is often a multi-level channelization technology,and the traditional multi-level channelization technology will use multiple frequency resolution channelization structures to complete the cross-channel signal reception,which will waste a lot of hardware resources.Therefore,this thesis combines multi-level channelization technology and uses the flexibility of weighted folding-add(WOLA)structure channelization to propose a multi-level configurable channelization structure for completing the reception of cross-channel signals.The main work contains the following aspects:1)The basic theory of digital channelization is analyzed.Researched the theory of high-speed signal acquisition and the prototype structure of digital channelization,elaborated the design method of digital filter bank and the gain of signal-to-noise ratio of digital channelization,studied the cross-channel phenomenon in the process of digital channelization and proposed a detailed solution.2)The efficient implementation structure of digital channelization is studied.The two efficient implementation structures of single-stage channelization are analyzed,and the digital channelization structure based on WOLA filter bank is deduced and analyzed specifically,and the structure is simulated by software to verify the correctness of the structure.The multi-level channelization theory is studied,and a configurable channelization structure is proposed combined with the flexibility of the WOLA structure.Each module flow of the structure is systematically described,and the structure is completed in the field programmable gate array(FPGA),and verified its correctness through hardware platform simulation.3)The key technologys of radar signal detection and collection system are researched.The common signal detection algorithm and the rabbit ear effect in the process of signal reception are analyzed.Combined with the conventional fixed threshold detection method,a dynamic threshold detection method is proposed,which is verified by software simulation.The Coordinate Rotation Digital Computer(CORDIC)algorithm is analyzed,and the in-pulse information acquisition technology is studied,including the time domain parameter acquisition technology and frequency domain parameter acquisition technology,and the frequency domain parameter acquisition technology is analyzed and verified by algorithm simulation.4)Combined with the above work,the radar signal channelization detection and collection system is studied in detail,the software framework of the radar signal detection system is constructed,and the implementation process of each module in the framework is described in detail.Then through hardware simulation,the test gradually verifies the correctness of each part and confirms the effectiveness and achievability of the system.