S波段全相参捷变频雷达收发中频部件设计  

Development of transceiver intermediate frequency parts for S-band coherent radar with fast frequency switching

作　　者：付钱华[1] 刘镰斧[1] 彭晓 杨远望[1] 

机构地区：[1]电子科技大学通信与信息工程学院,四川成都610054 [2]成都亚光电子微波毫米波研究所,四川成都610054

出　　处：《电子技术应用》2010年第1期43-46,共4页Application of Electronic Technique

基　　金：国家自然科学基金(60801024)

摘　　要：提出了一种由直接数字频率合成、倍频链和锁相环构成的二次变频方案,实现了宽带捷变频多普勒雷达收发中频部件系统设计。综合考虑频率合成器和雷达收发射频前端电路的设计要求,在保证频谱纯度的条件下,利用锁相环产生捷变频宽带本振,较好地将中心频率为50MHz的低频窄带线性扫频脉冲调制信号变频到具有500MHz带宽的S波段。给出了采用该方案的实验结果。A double conversion mechanism composing of direct digital frequency synthesis, double frequency chains and phase locked loop is proposed in this paper, and system of intermediate frequency parts for wide band Doppler radar with fast frequency switching is realized. The design demand of frequency synthesis and radio frequency front-part circuit in radar transceiver is considered fully, on the condition that guarantee spectrum purity, using phase locked loop produce local oscillation with fast frequency switching, we find a perfect solution that convert a low, narrowband, linear sweep and pulse modulated single with center frequency of 50 MHz to a S-band single with 500 MHz bandwidth. Some experimental results also presented in the end.

关 键 词：直接数字频率合成 线性调频 锁相环 二次变频 频谱纯度 

分 类 号：TN958.2[电子电信—信号与信息处理] TN74[电子电信—信息与通信工程]