Sub-array Digital Multiple Beamfroming Technology on PowerPc+FPGA Architecture

Phased array radar is very important in modern radar development, and sub-array digital multiple beam forming technology is the most significant technology in phased array radar. Digital multiple beam forming on each antenna element about large phased array radar is impossible because it needs so many A/D channels, sub-array digital multiple beam forming method can resolve this problem. This article mainly about, 1.Sub-array digital beam forming and low side lobe methods with radar work on search mode. 2.Sub-array digital beam forming (sum beam, azimuth difference beam, elevation difference beam) and low side lobe methods with radar work on tracking mode. 3. The function implementation of sub-array digital multiple beam forming with Power Pc+FPGA architecture. In this article, when radar work on different mode, there are different low side lobe weight Methods. When radar work on search mode, the low side lobe weight is on each antenna element controlled by digital attenuator embed in T/R module, and when radar work on tracking mode the low side lobe weight is on sub-array channel with digital style. The Power Pc+FPGA architecture used for radar signal processing is pioneer in China, experiment results prove that this architecture is better than other architectures, the whole processing time is less than 1 us.