Design And Realization Of Digital Array Radar IF Sampling And DBF Circuit

Digital array radar using digital beamforming (DBF) technique has many advantages, such as large dynamic range, simultaneous multi-beam forming, adaptive anti-jamming and so on. Combining Digital beamforming (DBF) and Software Defined Radio (SDR) technologies, to build a flexible and open DBF platform, has become a trend of the development of DBF technique.Under the background of the development of a digital array radar, this paper has carried out and completed the development of a multi-channel IF signal acquisition and DBF circuit, using A/D chip AD9643 of ADI company, A/D chip ADS6444 of TI company, and Kintex7 FPGA of Xilinx company. The main work of this paper includes the following aspects:1. The hardware development of multi-channel IF signal acquisition and DBF circuit has been completed, including:schematic design, PCB design, machining, welding and hardware debugging;2. The FPGA programming, debugging and verification of multi-channel wideband and narrowband IF software radio, and digital multi-beam forming has been completed;3. The performance testing for multi-channel IF signal acquisition hardware circuit have been completed, including Effective Number Of Bits(ENOB) testing, channel isolation testing, spurious-free dynamic range(SFDR) testing, and channel frequency response testing;4. The functional and performance testing of IF software radio and DBF have been completed.The measured and experimental results show that:the ENOBs are not less than 11 bits, channel isolations are greater than-63dB, SFDRs are greater than-69dB, the IF software radio channel frequency response are normal, and the performance of the multi-beam forming are perfect.