Design And Implementation Of Wideband Digital Channelized Receiver

The wideband intermediate frequency signal receiver usually uses the channelized technology which has been gradually maturing in the development of science and technology.The channelized technology has a lower signal processing bandwidth and rate,and it can improve the utilization rate of resources,etc.The implementation of the channelization has been changed from analogue devices to digital devices.The engineering application of wideband digital channelized receiver with digital devices is main stream now,and channelization results will directly affect the precision of subsequent signal sorting and direction finding,so the wideband digital channelized technology research and implementation has realistic significances.This paper explores the structure and implementation of wideband digital channelized receiver according to the characteristics of the radar signal which intercepted by the passive radar seeker and the characteristics of wideband digital channelized receiver.The main content is listed below:Firstly,we studied the uniform wideband digital channelized technology.We deduced efficient implementation structure according to its mathematical model-uniform digital channelized technology based on polyphase filter bank,and we do an implementation of a simulation and analyze the performance.Then according to the divisions of channel structure,we studied the subsequent processing method of the structure that can improve the reliability of the system.In order to solve the problems of the signal across a few channels,we studied the dynamic nonuniform digital channelized technology.A implementation structure of dynamic nonuniform wideband digital channelized receiver based on polyphase filters is deduced,and the deduction is verified by simulations.Secondly,in order to solve the overlap of sub-channels,we introduce the technology of Frequency Response Masking(FRM).In order to reduce the consumption of hardware resources,we introduce the technology of Complex Exponential Modulation(CEM).Thus we deduce a uniform channel structure based on the above two kinds of technology,and in order to further reduce the consumption of hardware resources by using the Half Band Filter(HB).The simulation results verify the feasibility of the structure and processing performance of channelization.And then the structure is compared with the algorithm complexity of other literature used.This structure of the filter bank has the characteristic of approximate sharp cut-off,and channelized processing results have lower rate of signal outputs,and using fewer hardware resources.Finally,we do the engineering practice of the channelized technology.We design the wideband and sorting signal processing hardware board of the passive radar seeker,including the overall design scheme and detailed design of software and hardware.We draw the schematic diagram and PCB diagram,and complete the debugging of peripheral circuit on the hardware board and efficient implementation of wideband digital channelized receiver of the FPGA program.Finally we complete the design and test and analysis the system performance.