FMICW用于单基机载SAR的成像研究  

Research on FMICW in Monostatic Airborne SAR Imaging

作　　者：侯海平[1] 杨俭[1] 曲长文[1] 

机构地区：[1]海军航空工程学院电子信息工程系,山东烟台264001

出　　处：《雷达科学与技术》2011年第2期115-119,共5页Radar Science and Technology

基　　金："泰山学者"建设工程专项经费资助;中国博士后科学基金(No.2005037772)

摘　　要：针对调频连续波合成孔径雷达(FMCW SAR)用于单基机载平台时无法实现发射和接收隔离的难题,提出了基于中断连续波(FMICW)的单基机载SAR成像研究。基于FMICW的信号特点,详细讨论了FMICW用于SAR成像时门控脉冲宽度、门控脉冲重复频率、门控脉冲周期数、扫频频率等参数的制约关系,给出了FMICW SAR的系统结构,并有针对性地分析了信号处理模块。最后结合距离多普勒(RD)算法对FMICW SAR进行成像仿真试验,对模型进行了验证。结果表明机载FMICW SAR不但可以有效解决收发隔离,并且可以实现对目标的精确成像。Isolation between transmitter and receiver can＇t be solved when frequency modulated continuous wave（FMCW） SAR is applied in monostatic airborne platform.Aiming at this problem,frequency modulated interrupted continuous wave（FMICW） is proposed in monostatic airborne SAR imaging.Based on the characteristics of FMICW signal,the restraint condition of the parameters in FMICW SAR including gate pulse width,gate pulse repetition frequency,gate pulse number in a sweeping period,and sweeping frequency etc.,are discussed in details.System construction of FMICW SAR is given and signal processing modules are analyzed.Finally,simulation is conducted for FMICW SAR based on range-Doppler（RD） algorithm to validate the proposed model.Results show that the airborne FMICW SAR can not only solve the isolation effectively,but also realize accurate imaging of targets.

关 键 词：合成孔径雷达(SAR) 调频中断连续波 收发隔离 成像 

分 类 号：TN957.5[电子电信—信号与信息处理] TN958[电子电信—信息与通信工程]