| GNSS反射信号海面高度测量及风速对反演精度的影响分析 |
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| 引用本文： | 沈思明,张云,杨树瑚,韩彦岭,洪中华.GNSS反射信号海面高度测量及风速对反演精度的影响分析[J].全球定位系统,2017,42(4):83. |
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| 作者姓名： | 沈思明 张云 杨树瑚 韩彦岭 洪中华 |
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| 作者单位： | 上海海洋大学 信息学院,上海201306 |
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| 摘 要： | 海面高度作为最重要的海洋物理参数之一,在预防海啸、风暴潮中起到重要作用,是海洋科学,遥感测绘领域的重要研究内容之一。粗糙度作为影响海面测高精度的重要因素之一,主要是由风速变化引起,本文为了探究风速引起的粗糙度变化对海面测高精度的影响,分别进行了湖面实验与海面实验。通过对风速与反射信号相位差RMS关系的研究,定性分析了粗糙度对测高精度的影响,结果表明,在反射信号相位差RMS增加0.005(单位rad)时,测高的误差RMS增加了近一倍。
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| 关 键 词： | GNSS 海面高度 粗糙度 风速 测高精度 |
Sea Surface Altimetry Using GNSS-R Signal and Analysis of Retrieval Accuracy Influenced by Wind Speed |
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| Institution: | College of Information Technology,Shanghai Ocean University, Shanghai 201306,China |
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| Abstract: | As one of the most important physical parameters of the ocean, sea surface height plays an important role in the prevention of tsunami and storm surge, and is one of the important research content of marine science and remote sensing surveying field. Roughness as an important factor affecting the sea surface altimetry, is mainly caused by the change of wind speed. In order to explore effects of roughness changes caused by wind speed on the accuracy of the height altimetry, two experiments were performed, the lake experiment and the sea experiment, respectively. Through the research of the wind speed and the reflection signal phase RMS relation, qualitative analysis of the influence of surface roughness on the accuracy of the height altimetry was performed. We find that the error of the sea surface altimetry RMS is nearly doubled when the skewing RMS is increased by 0.005 rad. |
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