Research On Channelization Technology Based On FRM

Recently,domestic and foreign research achievements on electronic warfare emerges in endlessly and the digital channelized receiver,as an important part of electronic warfare,occupies a very important position,also plays a key role in determining the direction of the war.For the improvement and optimization of channelization technology has become the current research hotspot.In this thesis,channelized technology is studied based on frequency response masking method.The structure reduces the computational complexity while reducing the occurrence of aliasing and aliasing,and the simulation results also verify the correctness of the structure.In the aspect of digital uniform channelization,some channelization related basic theories are introduced firstly,then the proof process is given.On the basis of the frequency band division of real signal and complex signal,aiming at the deficiency in the structure of channelized lowpass realization,the efficient structure of real signal and complex signal is deduced by using the principle of polyphase filtering,each structure is also analyzed and compared from the point of view of computational complexity.On this basis,the phenomenon of leaking-alarms and aliasing in the structure is analyzed,and the efficient structure of non-leaking-alarms and non-aliasing digital channelization is derived by overlapping the partial channel and expansion processing bandwidth.Secondly,with the development of channelized technology,the design method of narrow transition band filter is becoming more and more important for the optimization and remolding of channelization technology.This thesis deduces the classical frequency response masking technology,aiming at the existing two shielding filter's order problems,an improved method is proposed,this method reduces the computational complexity of the whole structure by interpolating the shielding filters,meanwhile,the designed filter has narrow transition band.Thirdly,in order to design a channelized structure with narrow transition band characteristics,this thesis applies classical FRM and FRM improved structure to channelized field.On the basis of the modulation filter banks,two narrow transition band channelization structures are proposed.Then,the computational complexity of the structure is analyzed.Theresults show that the structure has less computational complexity than the polyphase filtering channelized structure,and the final computer simulation results also verify the accuracy of the structure.Finally,in order to facilitate the extraction of parameters of receiving signals for subsequent research and analysis,an analysis before synthesis approach is adopted to solve the cross channel phenomena in uniform channelized structures.On the basis of signal precise reconstruction theory,the structure of synthesize filter banks is studied,the structure of synthesize filter banks based on polyphase structure is deduced,and the structure of dynamic reconfigurable channelized technology is proposed.The two structure can realize non-uniform division of channel,and the dynamic reconfigurable channelized architecture consumed less hardware resources and had strong flexibility.