雷达接收机数字化分析  

Analysis on Radar Receiver Digitalization

作　　者：孙宏利[1] 

机构地区：[1]中国电子科技集团公司第五十四研究所,河北石家庄050081

出　　处：《无线电工程》2011年第1期25-27,共3页Radio Engineering

摘　　要：通过实践证明,雷达数字接收机与模拟接收机相比,无论从电路结构还是从性能上,都充分体现了其优越性。在介绍某种雷达中频数字接收机的基础上,重点阐述了直接数字频率合成技术、直接中频采样和数字下变频技术,并给出了这2种数字技术的实现方法。介绍了直接数字频率合成芯片AD9854,并根据易于宽带滤波器设计的原则,推导了给定参数下使低通滤波器过渡带最宽的最佳采样频率。The practice has proven that the radar digital receiver has more advantages on circuit structure and performance compared to the analog receiver.This paper firstly introduces an intermediate frequency digital receiver of radar,and then expatiates on such techniques as direct digital frequency synthesis,direct intermediate frequency sampling and digital down-conversion,and it presents two implement methods for digital techniques.Also,it introduces the direct digital frequency synthesis chip AD9854.And this paper deduces optimal sampling frequency with given parameters,which makes the transition zone of lowpass filter be the widest.

关 键 词：数字化 接收机 直接中频采样 

分 类 号：TN957.5[电子电信—信号与信息处理]