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FY-3G降水测量雷达海洋定标精度检验与评估

袁梅 尹红刚 商建 江柏森 杨润峰 谷松岩 张鹏

袁梅, 尹红刚, 商建, 等. FY-3G降水测量雷达海洋定标精度检验与评估. 应用气象学报, 2024, 35(5): 526-537. DOI:  10.11898/1001-7313.20240502..
引用本文: 袁梅, 尹红刚, 商建, 等. FY-3G降水测量雷达海洋定标精度检验与评估. 应用气象学报, 2024, 35(5): 526-537. DOI:  10.11898/1001-7313.20240502.
Yuan Mei, Yin Honggang, Shang Jian, et al. Validation and evaluation of ocean calibration accuracy of FY-3G precipitation measurement radar. J Appl Meteor Sci, 2024, 35(5): 526-537. DOI:   10.11898/1001-7313.20240502.
Citation: Yuan Mei, Yin Honggang, Shang Jian, et al. Validation and evaluation of ocean calibration accuracy of FY-3G precipitation measurement radar. J Appl Meteor Sci, 2024, 35(5): 526-537. DOI:   10.11898/1001-7313.20240502.

FY-3G降水测量雷达海洋定标精度检验与评估

DOI: 10.11898/1001-7313.20240502
资助项目: 

中国气象局青年创新团队 CMA20240N10

国防科工局“十四五”民用航天预研项目 D040204

国防科工局“十四五”民用航天预研项目 D030303

中国科学院国际伙伴计划项目 183311KYSB20200015

详细信息
    通信作者:

    商建, 邮箱: shangjian@cma.gov.cn

Validation and Evaluation of Ocean Calibration Accuracy of FY-3G Precipitation Measurement Radar

  • 摘要: 年4月发射的风云三号气象卫星G星(FY-3G)是我国首颗专用降水测量卫星, 双频降水测量雷达(precipitation measurement radar, PMR)是该颗卫星上最核心的仪器。基于2023年7月数据, 利用海洋定标理论模型, 模拟海洋表面后向散射截面, 与观测海洋表面后向散射截面进行比对, 实现对PMR定标精度的初步评估。通过与国外星载双频降水测量雷达(global precipitation measurement, dual-frequency precipitation radar, GPM DPR)海洋定标检验结果比对, 评估FY-3G PMR定标的准确性。海洋定标精度检验结果表明: FY-3G PMR Ku波段在入射角小于15°时观测值与模型模拟值的偏差较小, 此时FY-3G PMR的偏差为1.65~2.73 dB, 偏差标准差为0.74~1.82 dB。FY-3G PMR Ka波段在18°入射角时偏差小于0.27 dB, 偏差的标准差为3.49 dB。FY-3G PMR与GPM DPR的定标偏差存在较为固定的偏差, 差异主要源自于数据本身的后向散射统计特性, 各入射角下FY-3G PMR Ku与Ka波段海洋表面后向散射数据稳定性与GPM DPR相当。
  • 图  1  年7月海洋表面后向散射截面月平均值

    Fig. 1  Monthly mean of sea surface backscattering cross section in Jul 2023

    图  1  年7月海洋表面后向散射截面月平均值

    Fig. 1  Monthly mean of sea surface backscattering cross section in Jul 2023

    图  2  年7月FY-3G PMR和GPM DPR 0°入射角下海洋表面后向散射截面统计直方图

    Fig. 2  Statistical histogram of sea surface backscattering cross section at 0° incidence angle of FY-3G PMR and GPM DPR in Jul 2023

    图  2  年7月FY-3G PMR和GPM DPR 0°入射角下海洋表面后向散射截面统计直方图

    Fig. 2  Statistical histogram of sea surface backscattering cross section at 0° incidence angle of FY-3G PMR and GPM DPR in Jul 2023

    图  3  年7月FY-3G PMR和GPM DPR海洋表面不同后向散射截面概率

    Fig. 3  Probability density of different sea surface backscattering intensity of FY-3G PMR and GPM DPR in Jul 2023

    图  3  年7月FY-3G PMR和GPM DPR海洋表面不同后向散射截面概率

    Fig. 3  Probability density of different sea surface backscattering intensity of FY-3G PMR and GPM DPR in Jul 2023

    图  4  年7月海洋表面后向散射截面月均方差及每轨平均值均方差

    Fig. 4  Mean square errors of monthly and orbit mean of sea surface backscattering cross section in Jul 2023

    图  4  年7月海洋表面后向散射截面月均方差及每轨平均值均方差

    Fig. 4  Mean square errors of monthly and orbit mean of sea surface backscattering cross section in Jul 2023

    图  5  年7月FY-3G PMR和GPM DPR不同风速区间的海洋定标结果

    Fig. 5  Ocean calibration results of FY-3G PMR and GPM DPR at different wind speed intervals in Jul 2023

    图  5  年7月FY-3G PMR和GPM DPR不同风速区间的海洋定标结果

    Fig. 5  Ocean calibration results of FY-3G PMR and GPM DPR at different wind speed intervals in Jul 2023

    表  1  FY-3G降水测量雷达主要性能指标

    Table  1  Main performance indexes of FY-3G PMR

    参数 Ku波段 Ka波段
    工作中心频率 13.35 ± 0.01 GHz 35.55 ± 0.01 GHz
    极化 HH HH
    脉冲体制 短脉冲 短脉冲/脉冲压缩
    扫描方式 交轨方向一维扫描 交轨方向一维扫描
    距离方向观测范围 -5~18 km(海拔) -5~18 km(海拔)
    6 dB距离分辨率 ≤ 250 m ≤ 250 m
    单程3 dB波束宽度 0.7°±0.02° 0.7°±0.02°
    观测刈幅 300 km 300 km
    最小可检测降水强度 0.5 mm·h-1 (18 dBZ) 0.2 mm·h-1 (12 dBZ)
    辐射精度 ≤ ±1 dB (3σ) ≤ ±1 dB (3σ)
    下载: 导出CSV

    表  1  FY-3G降水测量雷达主要性能指标

    Table  1  Main performance indexes of FY-3G PMR

    参数 Ku波段 Ka波段
    工作中心频率 13.35 ± 0.01 GHz 35.55 ± 0.01 GHz
    极化 HH HH
    脉冲体制 短脉冲 短脉冲/脉冲压缩
    扫描方式 交轨方向一维扫描 交轨方向一维扫描
    距离方向观测范围 -5~18 km(海拔) -5~18 km(海拔)
    6 dB距离分辨率 ≤ 250 m ≤ 250 m
    单程3 dB波束宽度 0.7°±0.02° 0.7°±0.02°
    观测刈幅 300 km 300 km
    最小可检测降水强度 0.5 mm·h-1 (18 dBZ) 0.2 mm·h-1 (12 dBZ)
    辐射精度 ≤ ±1 dB (3σ) ≤ ±1 dB (3σ)
    下载: 导出CSV

    表  2  年7月FY-3G PMR和GPM DPR海洋定标评估结果(Ku波段典型入射角)

    Table  2  FY-3G PMR and GPM DPR ocean calibration evaluation results (Ku-band typical incidence angle) in Jul 2023

    仪器 入射角/(°) 观测值/dB 模拟值/dB 平均偏差/dB 偏差标准差/dB
    FY-3G PMR -18 0.37 -2.37 2.74 3.20
    -15 3.72 2.07 1.65 1.82
    -10 9.33 7.63 1.70 1.68
    -5 12.04 10.36 1.68 0.74
    0 13.71 11.48 2.23 1.26
    5 12.77 10.36 2.41 0.74
    10 10.32 7.58 2.73 1.74
    15 4.62 2.06 2.55 1.82
    18 2.98 -2.38 5.36 3.17
    GPM DPR -18 -0.69 -3.39 2.70 3.41
    -15 2.65 1.39 1.26 2.08
    -10 7.98 7.39 0.59 2.27
    -5 11.45 10.39 1.06 1.24
    0 12.93 11.63 1.30 1.95
    5 11.53 10.45 1.09 1.21
    10 8.12 7.49 0.63 2.23
    15 2.67 1.54 1.13 2.10
    18 -0.58 -3.22 2.64 3.39
    下载: 导出CSV

    表  2  年7月FY-3G PMR和GPM DPR海洋定标评估结果(Ku波段典型入射角)

    Table  2  FY-3G PMR and GPM DPR ocean calibration evaluation results (Ku-band typical incidence angle) in Jul 2023

    仪器 入射角/(°) 观测值/dB 模拟值/dB 平均偏差/dB 偏差标准差/dB
    FY-3G PMR -18 0.37 -2.37 2.74 3.20
    -15 3.72 2.07 1.65 1.82
    -10 9.33 7.63 1.70 1.68
    -5 12.04 10.36 1.68 0.74
    0 13.71 11.48 2.23 1.26
    5 12.77 10.36 2.41 0.74
    10 10.32 7.58 2.73 1.74
    15 4.62 2.06 2.55 1.82
    18 2.98 -2.38 5.36 3.17
    GPM DPR -18 -0.69 -3.39 2.70 3.41
    -15 2.65 1.39 1.26 2.08
    -10 7.98 7.39 0.59 2.27
    -5 11.45 10.39 1.06 1.24
    0 12.93 11.63 1.30 1.95
    5 11.53 10.45 1.09 1.21
    10 8.12 7.49 0.63 2.23
    15 2.67 1.54 1.13 2.10
    18 -0.58 -3.22 2.64 3.39
    下载: 导出CSV

    表  3  年7月FY-3G PMR和GPM DPR海洋定标评估结果(Ka波段典型入射角)

    Table  3  FY-3G PMR and GPM DPR ocean calibration evaluation results (Ka-band typical incidence angle) in Jul 2023

    仪器 入射角/(°) 观测值/dB 模拟值/dB 平均偏差/dB 偏差标准差/dB
    FY-3G PMR -18 -3.59 -2.30 -1.29 3.51
    -15 -0.45 2.06 -2.51 2.00
    -10 4.83 7.63 -2.80 2.02
    -5 8.28 10.38 -2.10 1.02
    0 9.52 11.49 -1.97 1.57
    5 8.86 10.38 -1.52 1.02
    10 5.33 7.62 -2.29 2.01
    15 1.13 2.13 -1.00 2.01
    18 -1.98 -2.25 0.27 3.49
    GPM DPR -18 -1.72 -2.85 1.13 3.40
    -15 1.56 1.73 -0.17 1.99
    -10 6.94 7.46 -0.52 2.04
    -5 10.09 10.32 -0.23 1.04
    0 11.21 11.47 -0.26 1.46
    5 10.15 10.35 -0.20 1.03
    10 6.90 7.51 -0.61 2.02
    15 1.72 1.81 -0.09 1.98
    18 -1.44 -2.77 1.33 3.36
    下载: 导出CSV

    表  3  年7月FY-3G PMR和GPM DPR海洋定标评估结果(Ka波段典型入射角)

    Table  3  FY-3G PMR and GPM DPR ocean calibration evaluation results (Ka-band typical incidence angle) in Jul 2023

    仪器 入射角/(°) 观测值/dB 模拟值/dB 平均偏差/dB 偏差标准差/dB
    FY-3G PMR -18 -3.59 -2.30 -1.29 3.51
    -15 -0.45 2.06 -2.51 2.00
    -10 4.83 7.63 -2.80 2.02
    -5 8.28 10.38 -2.10 1.02
    0 9.52 11.49 -1.97 1.57
    5 8.86 10.38 -1.52 1.02
    10 5.33 7.62 -2.29 2.01
    15 1.13 2.13 -1.00 2.01
    18 -1.98 -2.25 0.27 3.49
    GPM DPR -18 -1.72 -2.85 1.13 3.40
    -15 1.56 1.73 -0.17 1.99
    -10 6.94 7.46 -0.52 2.04
    -5 10.09 10.32 -0.23 1.04
    0 11.21 11.47 -0.26 1.46
    5 10.15 10.35 -0.20 1.03
    10 6.90 7.51 -0.61 2.02
    15 1.72 1.81 -0.09 1.98
    18 -1.44 -2.77 1.33 3.36
    下载: 导出CSV
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  • 收稿日期:  2024-03-17
  • 修回日期:  2024-05-06
  • 刊出日期:  2024-09-30

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