| InSAR电离层校正中的平滑处理探究 |
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| 引用本文： | 张可欣,田崇瑞,焦健,曾琪明.InSAR电离层校正中的平滑处理探究[J].大地测量与地球动力学,2022,42(1):29-34. |
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| 作者姓名： | 张可欣 田崇瑞 焦健 曾琪明 |
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| 作者单位： | 北京大学地球与空间科学学院 |
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| 基金项目： | 国家重点研发计划(2017YFB0502703)。 |
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| 摘 要： | 针对距离向频谱分割法（range split-spectrum，RSS）进行InSAR电离层校正中多视视数和滤波窗口尺寸两种平滑处理参数选择较为主观的问题，采用国际参考电离层（international reference ionosphere，IRI）模型，通过目视对比和统计分析来评价RSS与IRI的相似性，并综合电离层分布特点为RSS平滑参数的选取提供一种相对客观的方法。最终为两对ALOS-2 PALSAR条带数据选取32×16的多视视数和600像素尺寸的滤波窗口，取得较好的InSAR电离层校正结果，验证了以IRI模型作为参考选取RSS平滑参数在无地表形变区域和缓慢地表形变区的可行性。
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| 关 键 词： | InSAR 电离层校正 RSS IRI |
Research on Smoothing in InSAR Ionospheric Correction |
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| ZHANG Kexin,TIAN Chongrui,JIAO Jian,ZENG Qiming.Research on Smoothing in InSAR Ionospheric Correction[J].Journal of Geodesy and Geodynamics,2022,42(1):29-34. |
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| Authors: | ZHANG Kexin TIAN Chongrui JIAO Jian ZENG Qiming |
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| Institution: | (School of Earth and Space Sciences,Peking University,5 Yiheyuan Road,Beijing 100871,China) |
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| Abstract: | The smoothing parameters of range split spectrum (RSS) in InSAR ionospheric correction, including multilook numbers and filtering window size, are selected subjectively, so we use international reference ionosphere (IRI) as a reference to evaluate the similarity between RSS and IRI by visual comparison and statistics analysis. Considering the ionospheric distribution, we provide a relatively objective method to select smoothing parameters for RSS. 32×16 (azimuth*range) multilook and 600 pixel size filtering window for two pairs of ALOS-2 PALSAR stripmap data. The ionospheric delay is corrected well. The research shows that the IRI model can be used as a reference to select RSS smoothing parameters in both invisible deformation and slow deformation regions. |
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| Keywords: | InSAR ionospheric correction RSS IRI |
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