机载毫米波SAR成像雷达的频率综合器设计优化

余铁军，由法宝，徐文莉，张晓东，崔向阳，任亚欣

（西安电子工程研究所，陕西　西安　710100）

摘　要：提出了一种应用于小型化机载平台的毫米波高分辨SAR 成像雷达频率综合器的技术方案，采用高速DDS+微波宽带低噪声倍频技术产生各种复杂波形信号，并采用预失真补偿技术对波形相位失真进行修正，采用低噪声乒乓式锁相环产生捷变频微波跳频频标，采用毫米波倍频、混频合成最终的毫米波频段宽带雷达信号，给出了频率综合器研制结果。最终设计的频率综合器具有大瞬时带宽、低相噪、捷变频、小型化、多功能等特点，能够产生SAR、GMTI 等工作模式所需要的各种复杂雷达波形信号，输出信号瞬时带宽可达1 GHz 以上。

关键词：毫米波；频率综合器；SAR 成像；宽带LFM 信号；LFM 信号预失真

中图分类号：TN743　文献标志码：A

作者简介：余铁军（1979—），男，工程硕士，E-mail：10899024＠qq.com。(www.xing528.com)

Design of frequency synthesizer for airborne millimeterwave high resolution SAR imaging radar

YU Tiejun，YOU Fabao，XU Wenli，ZHANG Xiaodong，CUI Xiangyang，REN Yaxin

（Xi'an Electronic engineering Research Institute，Xi'an 710100，China）

Abstract：A technical scheme of millimeter-wave high-resolution SAR imaging radar frequency synthesiz⁃er for miniaturized airborne platform is proposed.High-speed DDS and microwave frequency doubling technology are used to generate complex waveform signals，and pre-distortion compensation is applied to waveform phase distortion.The low-noise ping-pong phase-locked loop technology is used to realize the frequency agility func⁃tion，and the frequency doubling and mixing techniques are used to generate the millimeter-wave radar waveform signal.The paper presents the frequency synthesizer development results.The frequency synthesizer has the char⁃acteristics of large signal bandwidth，low phase noise，frequency agility，miniaturization，multi-function，etc.It can generate various radar waveform signals such as SAR and GMTI，and the signal bandwidth is greater than 1 GHz.

Keywords：millimeter wave；frequency synthesizer；SAR imaging；broadband LFM signal；LFM signal pre-distortion