一种瞬时大带宽DRFM系统的信道化设计

为实现宽带雷达回波信号的模拟生成,通常采用基于信道化技术的射频存储(DRFM)系统。在信道化DRFM系统中,不合理的信道划分方案和多相滤波器设计会导致频谱混叠、频谱分量缺失和幅度失真。文章提出了一种相邻信道频谱有50%交叠的信道划分方法,并对信道化滤波器组进行了优化设计。在此基础上,给出了一种瞬时大带宽DRFM系统的实现方案。仿真结果表明,文章提出的设计方案可以实现Nyquist采样带宽内雷达信号的射频存储和模拟转发,且具有较小的幅度失真,可以满足瞬时大带宽雷达回波信号的模拟需求。

Channel Distribution Scheme of an Instant Wideband DRFM System

In order to generate wideband radar echo, DRFM system based on channelization technology is commonly used.In the design of channelized DRFM system, inappropriate channel distribution and multi-phase filter design can causespectral aliasing, frequency component elimination and amplitude distortion. In this paper, a channel distribution schemewith 50% spectral aliasing for adjacent channels was proposed, and filter group of channelized DRFM system was opti.mized. On this basis, a high effect structure of instant wideband DRFM system was presented. Simulation results showedthat radio signal memory and duplication could be implemented for signal that band less than Nyquist sampling frequency,with smaller amplitude distortion and without frequency component elimination. This design scheme coluld be used to du.plicate radar echo with instant wideband.