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地球科学进展  2019, Vol. 34 Issue (2): 156-163    DOI: 10.11867/j.issn.1001-8166.2019.02.0156
    
基于SNRGPS-IR技术机理分析
孙小荣1,2,张书毕1,吴继忠3,郑南山1
1. 中国矿业大学 国土环境与灾害监测国家测绘地理信息局重点实验室,江苏 徐州 221116
2. 宿迁学院 建筑工程学院,江苏 宿迁 223800
3. 南京工业大学 测绘科学与技术学院,江苏 南京 211800
Mechanism Analysis of GPS-IR Technology Based on SNR
Xiaorong Sun1,2,Shubi Zhang1,Jizhong Wu3,Nanshan Zheng1
1. NASG Key Laboratory of Land Environment and Disaster Monitoring, China University of Mining and Technology, Jiangsu Xuzhou 221116, China
2. School of Civil Engineering and Architecture, Suqian College, Jiangsu Suqian 223800, China
3. School of Geomatics Science and Technology, Nanjing Tech University, Nanjing 211800, China
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摘要:

鉴于现有研究对GPS-IR技术的反射波接收、低高度角信噪比观测值的使用、信噪比残差的形态等机理还未阐释清楚,且几乎是通过实验进行解释,因此,从理论和实验2个方面对GPS-IR技术机理进行分析。理论和实验证明:GPS卫星发射的右旋圆极化波经一次反射后部分转换为左旋圆极化波,转换比例随着高度角和介电常数增大而变大,当右旋圆极化波垂直入射到理想导体表面时,经一次反射才能全部转换为左旋圆极化波;同时在测量型GPS接收机安装有抑径板的情况下,因衍射现象的存在,测量型GPS接收机天线仍能接收反射波中的右旋圆极化波。当高度角越小或介电常数越大时,GPS入射波中的垂直极化波和平行极化波的能量透射到反射物中就越少,其反射波的强度就越大,信噪比受反射波影响就越严重,且能够接收的右旋圆极化波较多,因此GPS-IR使用的是低高度角(如30°以下)的信噪比观测值。当高度角变化范围较小时,信噪比残差序列呈近似“余弦曲线”形态,从而建立了基于信噪比残差的反演模型。

关键词: SNRGPS-IR技术机理分析极化特性反演模型    
Abstract:

The available research on technology mechanism of reflected wave reception, the use of the SNR observations of low elevating angle and the form of SNR residuals for GPS-IR is not clear enough, and they are almost interpreted by experiments. This paper analyzed the GPS-IR technology mechanism from the aspects of theories and experiments. The right hand circular polarized wave transmitted by GPS satellite is partly converted into left hand circular polarized wave after one reflection, and the conversion ratio increases with the increase of satellite elevating angle and dielectric constant. When the right hand circular polarized wave is perpendicular to the surface of the perfect conductor, it can be all converted into left hand circular polarized wave after a reflection; At the same time, in the case of the measuring GPS receiver equipped with the baffle plate, because of the diffraction phenomenon, the antenna of the measuring GPS receiver can still receive the right hand circular polarized wave in the reflected signal. When the elevating angle is smaller or the dielectric constant of the reflector is larger, the less GPS incident wave energy of vertically polarized wave and parallel polarized wave is transmitted to the reflector. The more intense the reflected wave is, the worse the SNR is affected by the reflected wave, and there are more right hand circular polarized waves that can be received. Therefore, the GPS-IR uses the SNR observations of low elevating angle (such as under 30°). When the elevating angle changes and the range is smaller, the SNR residuals sequence is approximately "cosine curve", and thus, an inversion model based on SNR residuals is established.

Key words: SNR    GPS-IR technology    Mechanism analysis    Polarization characteristic    Inversion model.
收稿日期: 2018-09-04 出版日期: 2019-03-26
ZTFLH:  P228.4  
基金资助: 国家自然科学基金项目“GPS-IR监测土壤水分含量的反演模型研究”(编号:41504024)和“基于自适应节点与降相关技术的GNSS实时水汽层析理论与方法”(编号:41774026)资助.
作者简介: 孙小荣1980-),男,江苏扬州人,副教授,主要从事GNSS遥感方面研究.E-mail:19044@sqc.edu.cn
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引用本文:

孙小荣,张书毕,吴继忠,郑南山. 基于SNRGPS-IR技术机理分析[J]. 地球科学进展, 2019, 34(2): 156-163.

Xiaorong Sun,Shubi Zhang,Jizhong Wu,Nanshan Zheng. Mechanism Analysis of GPS-IR Technology Based on SNR. Advances in Earth Science, 2019, 34(2): 156-163.

链接本文:

http://www.adearth.ac.cn/CN/10.11867/j.issn.1001-8166.2019.02.0156        http://www.adearth.ac.cn/CN/Y2019/V34/I2/156

εrσ×10-3/(S/m)tanδ1tanδ2
海水81.03000.000.420000.54000
淡水81.00.500.000070.00009
1.4~3.00.010.00008~0.000040.00010~0.00005
土壤3.0~40.00.10~50.000.00003~0.190000.00004~0.24000
表1  反射物的近似物理参数[21]
图1  线极化波反射系数的模
图2  线极化波透射系数的模
图3  圆极化波反射系数的模
图4  直射波和反射波的天线增益
图5  PRN26卫星SNR变化曲线
图6  实验观测环境
图7  PRN5卫星SNR变化曲线
图8  PRN5卫星的L2载波dSNR观测值与拟合值
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