分布式星载SAR系统时间同步和波束同步误差分析

李航舰 王宇 邓云凯 王伟 张衡

李航舰, 王宇, 邓云凯, 王伟, 张衡. 分布式星载SAR系统时间同步和波束同步误差分析[J]. 雷达学报, 2018, 7(2): 244-253. doi: 10.12000/JR17028
引用本文: 李航舰, 王宇, 邓云凯, 王伟, 张衡. 分布式星载SAR系统时间同步和波束同步误差分析[J]. 雷达学报, 2018, 7(2): 244-253. doi: 10.12000/JR17028
Li Hangjian, Wang Robert, Deng Yunkai, Wang Wei, Zhang Heng. Analysis of Time and Beam Synchronization Errors for Distributed Spaceborne SAR System[J]. Journal of Radars, 2018, 7(2): 244-253. doi: 10.12000/JR17028
Citation: Li Hangjian, Wang Robert, Deng Yunkai, Wang Wei, Zhang Heng. Analysis of Time and Beam Synchronization Errors for Distributed Spaceborne SAR System[J]. Journal of Radars, 2018, 7(2): 244-253. doi: 10.12000/JR17028

分布式星载SAR系统时间同步和波束同步误差分析

doi: 10.12000/JR17028
基金项目: 国家自然科学基金优秀青年基金(61422113),国家万人计划青年拔尖人才,中科院百人计划
详细信息
    作者简介:

    李航舰(1990–),男,河北人,中国科学院电子学研究所通信与信息系统专业硕士研究生,研究方向为星载SAR系统同步技术。E-mail: lihangjian14@mails.ucas.ac.cn

    王宇:王   宇(1980–),男,河南人,现为中国科学院电子学研究所研究员,博士生导师,研究方向为SAR系统设计与信号处理技术。E-mail: yuwang@mail.ie.ac.cn

    邓云凯(1962–),男,研究员,现为中国科学院电子学研究所研究员,博士生导师,研究方向为星载合成孔径雷达系统设计。E-mail: ykdeng@mail.ie.ac.cn

    王伟:王   伟(1985–),男,河北人,毕业于中国科学院电子学研究所,获得博士学位,现为中国科学院电子学研究所助理研究员,研究方向为新体制星载SAR系统设计和信号处理。E-mail: ww_nudt@sina.com

    张衡:张   衡(1990–),男,山东人,中国科学院电子学研究所通信与信息系统专业博士研究生,研究方向为双基信号处理技术。E-mail: caszhmail@163.com

    通讯作者:

    李航舰   lihangjian14@mails.ucas.ac.cn

Analysis of Time and Beam Synchronization Errors for Distributed Spaceborne SAR System

Funds: The National Natural Science Foundation of China (61422113), The National Ten Thousand Talent Program-Young Top Notch Talent Program, The Hundred Talents Program of the Chinese Academy of Sciences
  • 摘要: 三大同步是分布式星载SAR系统需要解决的关键问题之一。该文系统分析了时间同步和波束同步误差对分布式星载SAR系统的影响,时间同步部分首先推导了时间同步误差对成像的影响,其次基于时间同步误差模型和脉冲对传相位同步模型,分析时间同步和相位同步导致的相位误差之间的关系,波束同步部分基于星载双基SAR系统的不同姿态导引方式,分析波束指向误差和卫星姿态误差对合成天线方向图的影响,以及对多普勒去相干的影响,最后分析波束同步误差对距离向重叠幅宽的影响。仿真结果验证了本文理论分析的正确性,分析结果可以为分布式星载SAR的系统设计提供重要指导。

     

  • 图  1  卫星姿态对系统的影响

    Figure  1.  Impacts of yaw angle, pitch angle and roll angle

    图  2  仅辅星进行多普勒导引

    Figure  2.  The first attitude steering strategy

    图  3  主星辅星分别进行多普勒导引

    Figure  3.  The second attitude steering strategy

    图  4  顺轨基线对相干系数的影响

    Figure  4.  Contributions to correlation coefficient versus along-track baseline

    图  5  无误差的波束覆盖情况

    Figure  5.  No beam pointing error case

    图  6  有误差的波束覆盖情况

    Figure  6.  Beam pointing error exists case

    图  7  固定时间误差影响仿真

    Figure  7.  Constant time error simulations

    图  8  回波域相位补偿后的结果

    Figure  8.  Time error simulations after compensation in echo domain

    图  9  波束指向引起的合成天线方向图增益损失

    Figure  9.  Gain loss versus beam pointing accuracy

    图  10  波束指向引起的相干系数变化

    Figure  10.  Coherent coefficient versus beam pointing accuracy

    图  11  卫星姿态引起的合成天线方向图增益损失

    Figure  11.  Gain loss versus satellite attitude accuracy

    图  12  卫星姿态引起的合成天线方向图增益损失

    Figure  12.  Coherent coefficient versus satellite attitude accuracy

    图  13  波束指向和卫星姿态对天线增益的综合影响

    Figure  13.  Overall influence on antenna gain versus beam pointing accuracy and attitude accuracy

    图  14  波束指向和卫星姿态对相干系数的综合影响

    Figure  14.  Overall influence on coherent coefficient versus beam pointing accuracy and attitude accuracy

    图  15  波束指向对重叠幅宽的影响

    Figure  15.  Overlapping swath error versus beam pointing accuracy

    图  16  横滚角对重叠幅宽的影响

    Figure  16.  Overlapping swath error versus roll angle

    图  17  横滚角和波束指向对重叠幅宽的影响

    Figure  17.  Overlapping swath error versus roll angle and beam pointing error

    表  1  仿真参数表

    Table  1.   Simulation parameters

    参数 数值
    载频(GHz) 1.30
    卫星高度(km) 700
    方位向天线长度(m) 6
    脉冲宽度(μs) 80
    距离向带宽(MHz) 100
    PRF(Hz) 1600
    卫星有效速度(m/s) 7500
    距离向波束指向精度(°) 0.06
    方位向波束指向精度(°) 0.05
    姿态控制精度(°) 0.02
    顺轨基线(km) 3
    下载: 导出CSV

    表  2  波束同步误差造成的辅星图像信噪比损失(dB)

    Table  2.   Influence of beam synchronization error on SNR (dB)

    波束指向精度(°) 姿态控制精度(°)
    0.01 0.02
    0.01 0.021 0.025
    0.02 0.028 0.032
    0.03 0.036 0.039
    0.04 0.046 0.048
    0.05 0.055 0.057
    下载: 导出CSV

    表  3  波束同步误差对重叠幅宽的影响(m)

    Table  3.   Influence of beam synchronization error to overlapping area (m)

    波束指向精度(°) 姿态控制精度(°)
    0.01 0.02
    0.01 260 411
    0.02 411 520
    0.03 582 663
    0.04 759 823
    0.05 938 991
    0.06 1119 1164
    下载: 导出CSV
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出版历程
  • 收稿日期:  2017-03-16
  • 修回日期:  2017-05-11
  • 刊出日期:  2018-04-28

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