Research Of Digital Beamforming Technology In Electronic Warfare System

Asa key technology in Shipborne RF integration system digital beamforming has been the focus research in recent years, but using digital beamforming in electronic warfare system research is still in its initial stage. So this paper devotes to electronic warfare system for the application background and carries out digital beam forming weighting, digital multiple beamforming,subarray technology, broadband digital beamforming of the research work. The main content includes:1. It makes a research of narrowband digital beam forming weighted method. It analyses window function weighted algorithm which uses for low sidelobe design and adaptive beamforming, and uses the diagonal loading method to improve the sampling matrix inversion algorithm in beam robustness.2. It makes a research of digital multiple beam and subarray beamforming. There are mainly two methods to implement digital multiple beam:independent weighted and FFT multiple beam. It Introduces the subarray beam forming principle and characteristics, and points out existing problems through the simulation which combines the digital multiple beam and subarray technology.3. It makes a research of the two methods of broadband beamforming:time domain and frequency domain method. Conventional frequency domain method uses digital channel as the foundation to complete theoretical derivation. Time domain analysis method devotes in the digital time delay filter,key research majors in Farrow structure of the fractional delay filter, and uses symmetrical structure coefficient algorithm to reduce its resource consumption by half. Finally considering the time domain method,the broadband constant beam width algorithm is introduced, and gives general design steps and scheme.4. The software solutions is designed in the background of one broadband beamforming system, and uses the Virtex-5FPGA development board for suppressing the digital multiple beam module simulation and verification. It combines the FPGA and optical fiber transmission to the relief the strict requirements in transmission broadband and delay. It makes a contrast of Aurora protocol of Xilinx company and SerialLite2protocol of Altera company and gives relevant simulation and plate level debugging results.