非平稳机载全极化SAR定量化测量误差分析及处理方法  

Error Analysis and Processing Method of Non-stationary Airborne Fully Polarimetric SAR Quantitative Measurement

作　　者：刘亚波 周晓杰 陆岷 喻忠军 LIU Yabo;ZHOU Xiaojie;LU Min;YU Zhongjun(Aerospace Information Research Institute,Chinese Academy of Sciences,Beijing 100094,China;School of Electronic,Electrical and Communication Engineering,University of Chinese Academy of Sciences,Beijing 100049,China)

机构地区：[1]中国科学院空天信息创新研究院,北京100094 [2]中国科学院大学电子电气与通信工程学院,北京100049

出　　处：《电子与信息学报》2023年第5期1611-1618,共8页Journal of Electronics & Information Technology

摘　　要：即使SAR系统内外定标非常准确,在不同飞行条件下,机载全极化SAR测量精度仍然存在一定的变化,特别在非平稳及高波段时,精度恶化较为严重。针对该问题,该文首先建立了非平稳环境下全极化SAR误差模型,然后分析了分时收发体制下通道间轨迹的微弱变化对极化相位不平衡度的影响,指出随着波段的提升,相同运动误差导致的相位不平衡度相应加重,据此给出了相应的处理方法。最后通过仿真及高分航空专项S波段SAR获取的数据对该方法进行了检验,开展的多次应用示范,也验证了方法的有效性和稳定性。Even though the internal and external SAR system calibration is very accurate,the accuracy of airborne fully polarimetric SAR measurement still changes to some extent under different flight conditions.In the condition of non-stationary and high frequency,the accuracy deteriorates seriously.In order to solve this problem,an error model of fully polarimetric SAR in non-stationary environment is proposed,and then the influence of the slight variation of trajectory between channels on the polarization phase imbalance degree in time-sharing transceiver system is analyzed.It is pointed out that the same motion error will aggravate the phase imbalance with the increase of the band.The corresponding processing method is proposed accordingly.Finally,the effectiveness of this method is verified by simulation and S-band SAR data.The effectiveness and stability of this method are also verified by several application demonstrations.

关 键 词：合成孔径雷达 定量化测量 误差分析 相位不平衡度 

分 类 号：TN958.2[电子电信—信号与信息处理]