Bended Phased Array Radar Beam Forming With Low Sidelobe Design And Implementation

Since the advent of radar in the 1930 s,it has been heavily promoted by the navies,and has been widely applied in the naval vessels.After years of development,its tactical and technical performance get significantly improved,has become a main component of shipboard weapon system,is the main information source of information warfare at sea,for the early warning,search,tracking,fire control and other tasks.The shipboard radar performance fit and unfit quality directly affect the operational capability of naval ships,which in turn affects the whole operational process,and even decides the success or failure of war.With the unceasing change of operational requirements and the progress and development of radar technology,radar adopts a series of new system and new technology,to develop multi-function.Phased array radar can simultaneously meet the target search,identification,capture,tracking,and other functions,at the same time with scanning fast,flexible beam control,strong anti-interference ability,etc.Ship-borne conformal phased array radar can not only play the advantages of phased array,and make full use of the limited space ship.This paper designs and implements the digital beam forming system of ship-borne conformal phased array radar.Firstly,this paper introduces the basic principle of digital beam forming,and expounds the beam forming of planar array.Sub-array processing of one dimensional linear array is analyzed and simulated.At the same time,use the two level weight to solve the problem of hige sidelobe,and then on the basis of the two level weight,sum and difference beam forming of planar array are analyzed with simulation.Followed,analyze the conformal array beam forming principle,in the case of adopting two level weight,the weights are optimized to obtain low sidelobe performance of sum and difference beam.Secondly,this paper establishes the hardware platform based on the algorithm requirements and develops and implements digital beam forming system on the hardware platform.Through the analysis of the radar signal processing framework,choose a kind of DSP and FPGA architecture.According to the requirements of the system communication,real-time and operation demands,choose FPGA of Xilinx and DSP of ADI,and the rest of the corresponding components of the model are established,designed a completely meet the requirements of the hardware platform.On hardware platform,according to the task partitioning of functional requirements,establish the overall design of the system.At the same time,analyze and design the main module,and carry on the timing and location constraints in order to achieve timing requirements.According to the mode requirements,complete the whole system analysis and design,and the design flow chart is given.Finally,this paper tests and verifies the function of digital beam forming system.Because the FPGA internal storage space is limited,choose appropriate waveform parameters for digital beam forming system to simulate and test.Each module is simulated and tested on the board,verified the validity of the sub module design.Eventually the function of the system is simulated and tested,and validated the correctness of the system design.