Digital Array Radar DBF's Signal-Processing Technology

With high-speed data collection, transmission and high-speed digital signal processing technology development, all-digital signal generation and processing of phased array radar has become a modern important trend. Digital array radar uses digital transmission and reception of digital technology in phased array antennas in digital signal and the completion of the conversion between analog signals, digital technology and the realization of phased array antenna technology the perfect combination to make it a highly flexible system reconfiguration capacity and efficient utilization of system resources and multi-tasking, multi-functional capacity to adapt to the unique advantages, but also its signal generation and signal processing systems design and engineering, presented a serious challenge.This thesis subject aims at digital array radar's development and need, comparatively analyze multicenter's DDC,DBF,commpress,adaptive DBF,designs eight channels's radar's signal processing in real time, test the arithmetics of radar's signal processing in real time,and implements eight channels's data streams of 25MB/s.In the system, we take combine of hardware and software. DBF and radar's DSP is implemented in the same board. There is eight channels importing the signal whose intermediate frequency is 4.25MHz and bandwith is 2MHz.In the part of hardware, sensor in the control of FPGA detect the signal, completing sampling the signals of eight channels,then sending eight digital signals whose sampling frequency is 12.5MHz and precision is 10 bits to the FPGA, then FPGA fulfills DDC,DBF,Pulse's compression to get signals of I,Q, then make the square root of the I,Q to get data stream of 12.5MB/s and transfer the result to the DAC which would outputs the video signal. We program on ISE, then check the result and format of signal by logic tool.