GEO SAR双频双通道动目标检测与参数估计  

Moving Target Detection and Parameters Estimation of Dual-frequency/Dual-channel GEO SAR

作　　者：程威 张顺生[1] Cheng Wei;Zhang Shunsheng(Research Institute of Electronic Science and Technology,University of Electronic Science and Technology of China,Chengdu,Sichuan 611731,China)

机构地区：[1]电子科技大学电子科学技术研究院,四川成都611731

出　　处：《信号处理》2020年第10期1744-1750,共7页Journal of Signal Processing

基　　金：国家自然科学基金(61671122)。

摘　　要：地球同步轨道合成孔径雷达(GEO SAR)在对动目标检测和成像方面更具优势,但随之而来的一些问题也需要进一步解决。本文提出了一种基于GEO SAR双通道双载频实现运动目标检测、成像和参数估计的方法。利用广义Keystone变换对杂波对消处理后的运动目标进行距离走动校正,使用离散调频傅里叶变换(DCFT)结合牛顿迭代法搜索完成多普勒参数估计后,利用在不同工作频率下的求得的速度集合进行交集来解决快速运动目标速度模糊的问题,并给出了一种简单高效的速度搜索算法。通过将传统的双通道一发多收体制扩展到双发双收体制,不仅可以有效抑制杂波,还可以避免运动目标多普勒重叠。最后,仿真实验证明该方法的有效性。Geosynchronous synthetic Aperture Radar(GEO SAR)has more advantages in moving target detection and imaging,but some problems need to be further solved.In this paper,a method of moving target detection,imaging and parameter estimation based on GEO SAR dual-channel and dual-carrier frequency is proposed.The generalized Keystone transform is used to correct the range migration of the moving target after clutter cancellation.After the Doppler parameters are estimated by discrete chirp-Fourier transform(DCFT)combined with Newton iterative method,the problem of velocity ambiguity of fast moving target is solved by the intersection of velocity sets obtained at different working frequencies,and a simple and efficient speed search algorithm is presented.By extending the traditional dual-channel one-transmit multiple-receiver system to double-transmit and double-receive system,not only clutter can be effectively suppressed,but also Doppler overlap of moving targets can be avoided.Finally,simulation results show that the method is effective.

关 键 词：地球同步轨道 杂波抑制 广义Keystone变换 运动目标检测 参数估计 

分 类 号：TN958[电子电信—信号与信息处理]