频率步进伪码-线性调频信号处理方法及成像  

Processing method of stepped PRBC-LFM signal and imaging

作　　者：刘加方 张云华[1,2,3] 董晓 LIU Jiafang;ZHANG Yunhua;DONG Xiao(Key Laboratory of Microwave Remote Sensing,Beijing 100190,China;National Space Science Center,Chinese Academy of Sciences,Beijing 100190,China;University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]中国科学院微波遥感技术重点实验室,北京100190 [2]中国科学院国家空间科学中心,北京100190 [3]中国科学院大学,北京100049

出　　处：《太赫兹科学与电子信息学报》2019年第4期681-685,708,共6页Journal of Terahertz Science and Electronic Information Technology

摘　　要：伪码-线性调频(PRBC-LFM)信号具有伪随机相位编码信号和线性调频信号的优点,是一种具有优良抗干扰性能和宽带特性的复合信号。提出一种针对宽带伪码-线性调频信号全去斜接收处理方法,能够实现在较低速率采样条件下完成对宽带伪码-线性调频信号的脉冲压缩。并结合频率步进技术,设计和实现了超大带宽的伪码-线性调频信号,对各子脉冲信号进行脉冲压缩后在频域进行相干合成,对合成得到的大带宽频谱进行逆傅里叶变换得到目标的高分辨力一维距离像。点目标一维距离像仿真和地面运动目标ISAR成像实验均验证了本方法的有效性。Pseudo-Random Binary phase Code and Linear Frequency Modulation(PRBC-LFM)has the advantages both of pseudo-random binary-phase code signal and linear FM signal,which has an excellent anti-jamming performance and broadband characteristics.A novel pulse compression method for PRBC-LFM is proposed based on dechirp receiver.The proposed method enables a low sampling rate for the wideband PRBC-LFM radar system,which simplifies the hardware system of wideband radar.Combining with stepped frequency technology,stepped PRBC-LFM signal is designed.The frequency domain synthesis method based on the pulse compression mentioned above is proposed to realize high range resolution.Computer simulation of point target’s range profile and ground moving target imaging experiment are conducted to verify the efficiency of the proposed method.

关 键 词：伪码-线性调频 全去斜处理 低速率采样 步进频 地面运动目标成像 

分 类 号：TN958[电子电信—信号与信息处理]