星载雷达和淮河流域X波段地基雷达反射率因子一致性分析

侯灿; 施丽娟; 王雨; 吴文玉; 卢燕宇; 冯妍; 杜波

doi:10.11834/jrs.20265384

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星载雷达和淮河流域X波段地基雷达反射率因子一致性分析
Consistency analysis of reflectivity between space-borne radar and X-band ground-based radar in the Huai River Basin
2026年30卷第5期页码：1464-1478
收稿：2025-09-30，

纸质出版：2026-05-07
DOI： 10.11834/jrs.20265384
稿件说明：

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侯灿，施丽娟，王雨，吴文玉，卢燕宇，冯妍，杜波.2026.星载雷达和淮河流域X波段地基雷达反射率因子一致性分析.遥感学报，30（5）： 1464-1478 DOI： 10.11834/jrs.20265384.

Hou C，Shi L J，Wang Y，Wu W Y，Lu Y Y，Feng Y and Du B. 2026. Consistency analysis of reflectivity between space-borne radar and X-band ground-based radar in the Huai River Basin. National Remote Sensing Bulletin， 30（5）：1464-1478 DOI： 10.11834/jrs.20265384.

摘要

将全球降水测量卫星GPM（Global Precipitation Measurement）搭载的Ku/Ka双频测雨雷达DPR（Dual-Frequency Precipitation Radar）和X波段地基雷达GR（Ground-based Radar）数据进行对比，以更好地了解二者的差异性和相似性，对星地雷达联合应用和X波段地基雷达定标校正有重要意义。本文通过质量控制、时空匹配、频率校正，获得2023年5—9月淮河流域凤阳X波段地基雷达和GPM KuPR反射率因子共8483组匹配样本，评估了凤阳X波段地基雷达和GPM KuPR反射率因子的一致性以及不同降水强度、类型和相态的影响。结果表明：GR和GPM KuPR探测到的降水回波分布型大体一致，但GR探测到的降水回波强度比GPM KuPR探测到的大。GR和GPM KuPR反射率因子呈现正相关，总体相关系数为0.73，GR反射率因子高于GPM KuPR，总体平均偏差为2.71 dB。GR和GPM KuPR反射率因子在轻度和中度降水时吻合良好，两种雷达偏差（GR-KuPR）均值在±5 dB以内，在强降水时两种雷达偏差绝对值增大。降水为小粒子时，两种雷达反射率因子吻合良好，偏差（GR-KuPR）均值在±5 dB以内，大粒子时偏差绝对值增大。在层状降水和亮带以下液态降水时，GR和GPM KuPR反射率因子一致性更好，相关系数分别为0.72、0.73，平均偏差分别为3.28 dB、2.82 dB，在对流降水和亮带以内混合态降水、亮带以上冰相降水，GR和GPM KuPR反射率因子一致性稍差，相关系数小于0.65。总体来说，在层状降水和液态降水时，X波段地基雷达和GPM DPR具有联合应用潜力，在强降水和复杂的气象条件时需要更进一步的处理。

Abstract

The Ku/Ka Dual-Frequency Precipitation Radar (DPR) aboard the Global Precipitation Measurement (GPM) satellite provides valuable data for studying precipitation characteristics. Comparing DPR data with X-band ground-based radar (GR) data is essential for understanding their similarities and differences

which in turn supports the integrated application of space-borne and ground-based radar systems and facilitates the calibration and correction of X-band ground-based radar.

In this study

a total of 8

483 matched samples of reflectivities from Fengyang X-band ground-based radar located in the Huai River Basin and GPM KuPR were collected

from May to September 2023. These samples were obtained after undergoing rigorous quality control

spatio-temporal matching

and frequency calibration. Based on these samples

the consistency of reflectivities between the Fengyang X-band radar and GPM KuPR was conducted. Furthermore

the impact of varying precipitation intensities

precipitation types

and precipitation phases on the consistency between the two instruments was analyzed.

Results indicate that the precipitation echo patterns detected by GR and GPM KuPR are generally consistent

although GR tends to detect stronger echo intensities. The reflectivities of GR and GPM KuPR show a positive correlation

with an overall correlation coefficient of 0.73. The reflectivities of GR are higher than that of GPM KuPR

and the overall average deviation is 2.71 dB. During light and moderate precipitation

the reflectivities of GR and GPM KuPR agree well

with average deviations (GR - KuPR) within ±5 dB. However

during heavy precipitation

the absolute deviation increases significantly. When precipitation consists of small particles

the reflectivities measured by the two radars exhibit good agreement

with average deviations (GR - KuPR) within ±5 dB. In the case of large precipitation particles

the absolute deviation increases significantly. In stratiform precipitation and liquid precipitation below the bright band

the consistency between GR and GPM KuPR is relatively high

with correlation coefficients of 0.72 and 0.73

and average deviations of 3.28 dB and 2.82 dB

respectively. Conversely

in convective precipitation

mixed precipitation within the bright band

and ice-phase precipitation above the bright band

the consistency is relatively lower

with correlation coefficients below 0.65.

Overall

X-band ground-based radar and GPM DPR demonstrate potential for combined application in stratiform and liquid precipitation

but further calibration and processing are required for heavy precipitation and complex meteorological conditions.

关键词

Keywords

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