基于相关功率修正的地基GNSS-R土壤湿度反演

洪学宝; 张波; 阮宏梁; 汉牟田; 杨东凯; 宋曙辉

doi:10.13700/j.bh.1001-5965.2020.0154

基于相关功率修正的地基GNSS-R土壤湿度反演

doi: 10.13700/j.bh.1001-5965.2020.0154

1.
北京航空航天大学电子信息工程学院, 北京 100083
2.
金华职业技术学院金义网络经济学院, 金华 321000
3.
北京市农林科学院蔬菜研究中心, 北京 100097

基金项目:

浙江省基础公益研究计划 LGN19D040001

地理信息工程国家重点实验室开放基金课题 SKLGIE2018-M-2-2

详细信息

通讯作者:
张波, E-mail: bozhang@buaa.edu.cn

中图分类号: V19;P237
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- 被引次数: 0
出版历程
- 收稿日期: 2020-04-21
- 录用日期: 2020-05-25
- 网络出版日期: 2021-08-20

Ground-based GNSS-R soil moisture retrieval based on correlation power correction

1.
School of Electronics and Information Engineering, Beihang University, Beijing 100083, China
2.
Jinyi Network Economy College, Jinhua Polytechnic, Jinhua 321000, China
3.
Beijing Vegetable Research Center, Beijing Academy of Agricultural and Forestry Sciences, Beijing 100097, China

Funds:

Zhejiang Basic Public Welfare Research Project LGN19D040001

State Key Laboratory of Geo-information Engineering Open Fund Project SKLGIE2018-M-2-2

More Information

Corresponding author: ZHANG Bo, E-mail: bozhang@buaa.edu.cn

摘要

摘要:
利用全球导航卫星系统反射信号测量技术(GNSS-R)进行土壤湿度反演过程中，实际接收天线方向性会造成GNSS直反信号相关功率测量偏差。针对地基观测场景下天线方向性造成的相关功率的类余弦振荡问题，提出了基于多项式拟合的信号相关功率修正方法。为了验证所提方法的有效性，开展了地基GNSS-R土壤湿度观测实验，结果表明：基于多项式拟合的相关功率修正可以消除信号相关功率的类余弦振荡，提升GNSS-R土壤湿度反演中的观测数据有效性和反演结果准确性。
- 全球导航卫星系统反射信号测量技术(GNSS-R) /
- 相关功率 /
- 振荡偏差 /
- 多项式拟合 /
- 土壤湿度
Abstract:
In soil moisture observation using Global Navigation Satellite System Reflectometry (GNSS-R) technique, actual antennas' directionalities will bring about the biases in the correlation power measurements of the direct and reflected GNSS signals. For eliminating the cosine-like oscillatory bias of the correlation power caused by antenna directionality in ground-based scenario, this paper proposes a correlation power correction method based on the polynomial fitting. In order to verify the validity of this method, the ground-based GNSS-R soil moisture observation experiment is carried out. The experimental results show that the correlation power correction using polynomial fitting can remove the cosine-like oscillation of the correlation power waveform, and then improve the efficiency of measurement data and the accuracy of retrieval results.
- Global Navigation Satellite System Reflectometry (GNSS-R) /
- correlation power /
- oscillatory bias /
- polynomial fitting /
- soil moisture

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图 1 实验场景

Figure 1. Experimental scenario

下载: 全尺寸图片幻灯片

图 2 GPS与BDS可见星空视图

Figure 2. Visible starry sky plots of GPS and BDS satellites

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图 3 修正前后直射和反射信号相关功率

Figure 3. Correlation power of direct and reflected signals before and after correction

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图 4 土壤湿度测量结果

Figure 4. Soil moisture measurement results

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表 1 数据有效性统计结果

Table 1. Statistical results of data validity

卫星编号	数据总量/个	修正前有效数/个	修正后有效数/个
GPS PRN21	3 572	2 706	3 572
BDS PRN7	3 573	2 120	3 573
BDS PRN32	2 937	2 027	2 937
总计	10 082	6 853	10 082

下载: 导出CSV

表 2 反演结果均方根误差

Table 2. RMSE of retrieval results

卫星编号	未修正结果RMSE/%	修正后结果RMSE/%
GPS PRN21	13.3	11.1
BDS PRN7	3.9	3.5
BDS PRN32	11.0	4.5
总体	10.5	7.3

下载: 导出CSV

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