[关键词]
[摘要]
数字下变频（Digital Down Conversion,DDC）是宽带雷达中频接收机的关键技术之一,传统DDC实现方法在现有FPGA上无法满足带宽和滤波器精度对硬件资源的要求.针对这一问题,提出了一种数字下变频结构优化方法,给出了分布算法实现FIR滤波器的结构,研制出了一种最优化免混频数字下变频器,并已经成功应用于某宽带雷达系统.
[Key word]
[Abstract]
Digital Down Conversion(DDC) is one of the key techniques of digital receiver for wideband radar.With the conventional method of implementing DDC,the hardware source of current FPGA can't satisfy the demand of bandwidth and high precision of FIR filter.For this purpose,the optimization of architecture for DDC is presented.Introduce a FIR filter architecture based on distributed algorithm and develop an optimal DDC which needs no mixing.It has been applied to a wideband radar system successfully.
[中图分类号]
TN957.5
[基金项目]
国家863项目资助（2002AA731130）
