Optics and Precision Engineering, Volume. 31, Issue 11, 1631(2023)

On-orbit geometric calibration and preliminary accuracy verification of GaoFen-14 (GF-14) laser altimetry system

Bincai CAO1...2,*, Jianrong WANG1,2, Yan HU1,2, Yuan LÜ1,2, Xiuce YANG1,2, and Xueliang LU12 |Show fewer author(s)
Author Affiliations
  • 1State Key Laboratory of Geo-information Engineering, Xi'an70054, China
  • 2Xi’an Research Institute of Surveying and Mapping, Xi'an710054, China
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    Figures & Tables(13)
    Schematic diagram of satellite laser ranging (Linear detection systems)
    GF-14 laser ranging system
    Beam geometry structure of on-orbit GF-14 laser ranging system
    Strict geometry model of laser altimetry
    Inner Mongolia laser calibration field location
    Gaussian fitting of laser spot center
    Ground detector data acquision
    • Table 1. Basic parameters of GF-14 laser ranging system

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      Table 1. Basic parameters of GF-14 laser ranging system

      参 数设计值
      通道数量3
      重复频率2 Hz
      工作波长(1 064±0.5) nm
      回波采样频率1 008 MHz
      回波量化位数12 bit
      测距范围450~550 km
      光斑大小(直径)约60 m
      测距精度1 m (坡度<15°)
      相机分辨率7.2 m (@492.9 km)
      相机幅宽≥40 km
      相机尺寸

      3片CMOS(Complementary Metal-Oxide-Semiconductor),

      像元尺寸为5.5 μm×5.5 μm,像元尺寸为2 048(垂轨)×576(沿轨)

      量化位数12 bit
    • Table 2. Laser footprint predition and captured number of footprints

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      Table 2. Laser footprint predition and captured number of footprints

      日 期

      足印预测

      平面误差/m

      捕获光斑数量备 注
      LAS1LAS2LAS3
      5月18日30111阴天有云,不使用
      5月30日15212
      6月3日334(可用3)3LAS2各自剔除一个异常点
      6月7日734(可用3)3
    • Table 3. Internal accuracy of laser calibration

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      Table 3. Internal accuracy of laser calibration

      通道时间点号标定后脚点与控制点残差
      dEdNdH
      LAS106031-1.0800.3910.292
      2-1.839-1.1590.413
      3-0.0800.8160.130
      060711.534-0.3320.217
      2-0.284-0.4960.264
      3-0.2120.1170.130
      LAS2060311.1800.2320.092
      2-0.533-2.0900.281
      30.0991.1990.134
      060710.309-0.7140.143
      2-0.213-0.3220.117
      3-0.0310.5080.132
      LAS306031-1.267-0.8950.164
      2-0.4051.4560.179
      3-0.365-0.6990.130
      06071-0.004-0.568-0.062
      2-0.4240.3090.116
      3-0.258-0.1320.130
    • Table 4. Laser calibration accuracy (point 2 on June 7 as control point, and the rest as check points)

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      Table 4. Laser calibration accuracy (point 2 on June 7 as control point, and the rest as check points)

      通道时间点号标定后脚点与控制点残差中误差
      dEdNdH平面高程
      LAS1060312.2493.686-0.1254.1940.181
      21.4902.134-0.004
      33.2494.111-0.287
      LAS1060711.6520.0140.0801.1700.056
      3-0.0940.464-0.008
      LAS2060312.8652.393-0.3093.2180.246
      20.5410.679-0.120
      33.8311.312-0.268
      LAS2060710.393-0.4240.1600.6970.154
      30.0520.7980.149
      LAS3060311.9473.603-0.2525.2500.259
      22.8095.955-0.238
      32.8503.798-0.287
      LAS3060710.326-1.026-0.0420.8690.110
      30.072-0.5900.150
    • Table 5. Laser calibration accuracy (half of points as control points and the other half as check points)

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      Table 5. Laser calibration accuracy (half of points as control points and the other half as check points)

      通 道时间点号标定后脚点与控制点残差均方根误差
      dEdNdH平面高程
      LAS1060332.8662.352-0.1502.5570.190
      06072-0.551-1.9110.263
      3-0.478-1.2970.129
      LAS2060311.9140.341-0.3212.0910.256
      30.8331.307-0.280
      06072-0.609-2.5610.122
      LAS3060311.2912.358-0.2733.6200.220
      22.1534.711-0.259
      06071-0.329-2.273-0.063
    • Table 6. Parameters of different calibration strategies

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      Table 6. Parameters of different calibration strategies

      通道

      控制点

      方案

      dαdθdρ
      LAS10603全部0.001 110.000 062-1.271
      0607全部0.001 330.000 058-1.079
      0607单点0.001 350.000 058-0.942
      两日全部0.001 230.000 058-1.087
      LAS20603全部-0.006 31-0.000 28212.002
      0607全部-0.006 28-0.000 27712.552
      0607单点-0.006 28-0.000 27612.517
      两日全部-0.006 28-0.000 27912.475
      LAS30603全部-0.004 52-0.000 597-0.977
      0607全部-0.004 83-0.000 593-0.466
      0607单点-0.004 81-0.000 592-0.472
      两日全部-0.004 68-0.000 593-0.469
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    Bincai CAO, Jianrong WANG, Yan HU, Yuan LÜ, Xiuce YANG, Xueliang LU. On-orbit geometric calibration and preliminary accuracy verification of GaoFen-14 (GF-14) laser altimetry system[J]. Optics and Precision Engineering, 2023, 31(11): 1631

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    Paper Information

    Category: Modern Applied Optics

    Received: Nov. 4, 2022

    Accepted: --

    Published Online: Jul. 4, 2023

    The Author Email: CAO Bincai (cbconthe-way@163.com)

    DOI:10.37188/OPE.20233111.1631

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