Study On Reconfigurable Receving Channel Structures For Wideband Digital Array Radar

Wide-band digital array radar(WB-DAR),which operates with wideband signals,is an all-digital phased array radar that uses digital beamforming to form receiving and transmiting beams.It has great anti-jamming capability and multi-mode switching capability,which provides an ideal hardware platform for the next generation of multi-functional software-based radar.At present,WB-DAR has been widely used as a hardware platform in the practical high-performance radar system,but the high-speed signal processing speed and the large number of hardware resources increase the complexity and cost of the system,and then limit the application of the WB-DAR.How to optimize the system structure and reduce the complexity of the process is still the focus of the study.As the main component of WB-DAR,this thesis studied the reconfigurable low-complexity structure of the receiving channel.Based on a large number of literatures on reconfigurable technology and wideband radar receiving channel structure,this thesis proposes a new receiving channel based on Farrow structure and multi-phase structure,which can effectively reduce the system processing tasks and provides a receiving channel that can flexibly switch frequency response characteristics in different radar operating modes and fully meets the WB-DAR system’s anti-intercept application requirements.This thesis mainly works on the following aspects of research:In this thesis,the basic principle of parallel signal processing of wideband digital signal is analyzed,and the modules of the receiving channel structure are studied accordingly.Secondly,the signal processing method of the traditional broadband digital array receiving channel is improved by using the Farrow structure to realize a new reconfigurable receiver channel structure based on fractional delay beamforming with comparison of different fractional delay techniques,The fractional delay(VFD)module and the extraction module and the anti-aliasing filter in the traditional structure are integrated to the fractional delay extractor,and the complexity of the whole structure is greatly reduced by the proper design of the channel filter.Through the MATLAB simulation,the complexity of the traditional receiving channel and the new receiving channel structure are compared,which shows that the new receiving channel structure has obvious advantages from the hardware resource consumption.Through the simulation of different receiving channels,the flexibility and reconfigurability of the new receiving channel structure are verified.