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非平稳机载全极化SAR定量化测量误差分析及处理方法

刘亚波 周晓杰 陆岷 喻忠军

刘亚波, 周晓杰, 陆岷, 喻忠军. 非平稳机载全极化SAR定量化测量误差分析及处理方法[J]. 电子与信息学报, 2023, 45(5): 1611-1618. doi: 10.11999/JEIT220475
引用本文: 刘亚波, 周晓杰, 陆岷, 喻忠军. 非平稳机载全极化SAR定量化测量误差分析及处理方法[J]. 电子与信息学报, 2023, 45(5): 1611-1618. doi: 10.11999/JEIT220475
LIU Yabo, ZHOU Xiaojie, LU Min, YU Zhongjun. Error Analysis and Processing Method of Non-stationary Airborne Fully Polarimetric SAR Quantitative Measurement[J]. Journal of Electronics & Information Technology, 2023, 45(5): 1611-1618. doi: 10.11999/JEIT220475
Citation: LIU Yabo, ZHOU Xiaojie, LU Min, YU Zhongjun. Error Analysis and Processing Method of Non-stationary Airborne Fully Polarimetric SAR Quantitative Measurement[J]. Journal of Electronics & Information Technology, 2023, 45(5): 1611-1618. doi: 10.11999/JEIT220475

非平稳机载全极化SAR定量化测量误差分析及处理方法

doi: 10.11999/JEIT220475
详细信息
    作者简介:

    刘亚波:男,副研究员,博士,研究方向为合成孔径雷达系统仿真与信号处理

    周晓杰:男,硕士生,研究方向为极化合成孔径雷达定标

    陆岷:男,助理研究员,博士,研究方向为机载合成孔径雷达系统设计

    喻忠军:男,研究员,研究方向为机载合成孔径雷达系统设计

    通讯作者:

    刘亚波 liuyb@aircas.ac.cn

  • 中图分类号: TN958.2

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

  • 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。
  • 图  1  全极化天线嵌套实现和分孔径实现方式

    图  2  机载全极化SAR定量化测量的处理流程

    图  3  速度、通道间速度差与位置差示意

    图  4  点目标相位误差

    图  5  Pauli分解图

    图  6  定标场飞行情况

    图  7  测区飞行情况

    表  1  国内外典型SAR系统定标精度

    平台SAR绝对定标精度(dB)相对辐射定标精度(dB)极化隔离度(dB)通道不平衡度(dB)相位不平衡度(°)
    机载毫米波SAR[15]$ \le 2 $$ \le 1 $
    X-SAR[16]$ \le 2$$ \le 1$$ \pm 0.2$$ \pm 11$
    UAVSAR[20]$ \le 1$$ \le 0.7$$ - 30$$ \pm 0.04$$ \pm 6$
    F-SAR[21]$ \le 2$$ \le 0.3$$ - 37$$ \pm 2$
    Pi-SAR-L2[22]$ \le 1$$ - 35$$ \pm 0.2$$ \pm 5$
    星载SIR-C[23]$ \le 3 $$ \le 1.5 $$ - 30$$ \pm 0.4$$ \pm 10$
    Tandem-X[24]$ \le 0.5$$ \le 0.2$
    Sentinel-1A[25]$ \le 1$$ \le 0.5$$ - 33.2$$ \pm 0.2$$ \pm 13$
    AlSO-2[26]$ \le 1$$ \le 0.5$$ - 40$$ \pm 1$$ \pm 5$
    GF-3[27,28]$ \le 1.5$$ \le 1$$ - 45$$ \pm 0.5$$ \pm 10$
    下载: 导出CSV

    表  2  雷达及飞行参数表

    参数数值
    载频(GHz)3,9,35
    采样频率(MHz)400
    中心视角(°)60
    带宽(MHz)300
    中心斜距(m)5000
    数据积累时间(s)11.1
    航向速度(m/s)70
    YZ方向速度(m/s)0.1
    YZ方向加速度(m/s2)0.01
    下载: 导出CSV

    表  3  S波段飞行参数

    参数数值
    机场测区
    载频(GHz)3.240040~55300
    采样频率(MHz)
    视角(°)
    带宽(MHz)
    中心斜距(m)28175818
    飞行高度(m)19934206
    飞机速度(m/s)7176
    下载: 导出CSV

    表  4  机场角反射器补偿前后性能指标(°)

    补偿前补偿后
    同极化通道相位不平衡度3.473.19
    交叉极化通道相位不平衡度3.071.17
    下载: 导出CSV

    表  5  裸土同极化通道相位测量(°)

    区域入射角补偿前补偿后
    141.932.151.46
    242.833.261.71
    344.392.311.51
    447.033.752.22
    550.313.992.77
    651.934.163.61
    752.516.173.9
    相位不平衡度3.892.62
    下载: 导出CSV
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出版历程
  • 收稿日期:  2022-04-19
  • 修回日期:  2022-07-07
  • 网络出版日期:  2022-07-11
  • 刊出日期:  2023-05-10

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