机载前视阵列SAR分时接收分析及校正  

Analysis and Correction of Time Diversion Multiplexing Receiving of Airborne Forward Looking Array SAR

作　　者：张英杰 周彬 饶裕 娄毅峰 成志强 陈卉 Zhang Yingjie;Zhou Bin;Rao Yu;Lou Yifeng;Cheng Zhiqiang;Chen Hui(The 29th Research Institute of China Electronics Technology Group Corporation,Chengdu,China;Spaceon T&C Techonlogy Co.,Ltd.,Chengdu,China)

机构地区：[1]中国电子科技集团公司第二十九研究所,四川成都 [2]成都天奥测控技术有限公司,四川成都

出　　处：《科学技术创新》2023年第23期67-74,共8页Scientific and Technological Innovation

摘　　要：结合调频连续波(FMCW)技术的机载前视阵列合成孔径雷达(SAR)既能够获取飞机前下方区域图像,又具有FMCW体制雷达体积小、重量轻的优势,易于安装在直升机等轻小型平台。由于是利用阵列天线来实现雷达成像,故阵列天线的接收方式是实际情况中一个值得研究的问题。本研究分析了阵列天线阵元采取分时接收方式对回波信号的影响,推导了其信号模型,研究了相应的校正方法。在此基础上将研究的校正方法嵌入到一种适合于前视阵列SAR的改进的频率变标算法(FSA)中,最后通过仿真实验验证了所研究补偿方法的有效性。Combined with Frequency-Modulated Continuous-Wave(FMCW)technology,airborne forward-looking synthetic aperture radar(SAR)with linear array antennas can obtain the image in front of the aircraft and also have the advantages of FMCW radar such as small size and lightweight.Moreover,it is suitable to be installed on platform like helicopter and small unmanned aerial vehicle.The receiving method of linear array antennas is a valuable problem in practice for it is the linear array antennas that implements radar images.This paper analyses the influence of time diversion multiplexing receiving of the linear array antenna on echo model,presents the echo model and studies a corresponding correction.Moreover,the correction is applicable to an improved frequency scaling algorithm(FSA)for FMCW forward looking SAR with linear array antennas.Finally,the correction is verified with the simulation.

关 键 词：前视阵列合成孔径雷达 调频连续波 分时接收 频率变标算法 

分 类 号：TN958[电子电信—信号与信息处理]