文中介绍了一种基于高速现场可编程门阵列(FPGA)加上高速数字模拟转化器(DAC)的超宽带任意波形产生的方法,详细阐述了数字上变频技术(DUC)、并行数控振荡器(NCO)和多相有限长单位脉冲响应(FIR)滤波器的原理,提出了基于多相FIR滤波和并行NCO结构的DUC实现方法。该方法最大的特点就是降低了运算速度,便于在FPGA内实现,从而可直接产生带宽大于1 GHz 的任意波形。最后介绍了该方法在工程中的应用,并给出了测试指标。此方法已广泛应用于各类宽带雷达上

An ultra-wide-band waveform generation technology based on high-speed field-programmable gate array ( FPGA) and digital to analog converter (DAC) is introduced in this paper. The theory of digital up converter (DUC), parallel numerically controlled oscillator (NCO) and polyphase finite impulse response (FIR) are expounded, and the technology of DUC based on polyphase FIR and parallel NCO is proposed. In this technique, lowering the running speed is the biggest feature and good for realization in FPGA and can generate arbitrary waveform directly with bandwidth above 1 GHz. In the end, engineering implementation of this technique is introduced and test result of module is given. This technology has widely applied in all kinds of wideband radar.

TN957. 51