基于QZSS L1信号的岸基GNSS-R码延迟海面测高

储倜; 贺凯飞; 高凡; 贺匀峤; 孟馨悦; 徐天河

doi:10.13700/j.bh.1001-5965.2020.0630

基于QZSS L1信号的岸基GNSS-R码延迟海面测高

doi: 10.13700/j.bh.1001-5965.2020.0630

储倜^{1, 2},
贺凯飞^1, ,,
高凡^{2, 3},
贺匀峤³,
孟馨悦³,
徐天河²

1.
中国石油大学(华东) 海洋与空间信息学院, 青岛 266580
2.
山东大学空间科学研究院, 威海 264209
3.
山东大学空间科学与物理学院, 威海 264209

基金项目:

国家自然科学基金 41604027

国家自然科学基金 41604003

国家自然科学基金 42074028

青岛海洋科学与技术国家实验室开放基金 QNLM2016ORP0401

中央高校基本科研业务费专项资金 18CX02054A

详细信息

通讯作者:
贺凯飞, E-mail: kfhe@upc.edu.cn

中图分类号: V221.3;TB553
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- 被引次数: 0
出版历程
- 收稿日期: 2020-11-12
- 录用日期: 2021-01-17
- 网络出版日期: 2022-04-20

Coastal GNSS-R ocean altimetry based on code delay of QZSS L1 signal

CHU Ti^{1, 2},
HE Kaifei^{1
, ,},
GAO Fan^{2, 3},
HE Yunqiao³,
MENG Xinyue³,
XU Tianhe²

1.
College of Oceanography and Space Informatics, China University of Petroleum (East China), Qingdao 266580, China
2.
Institute of Space Science, Shandong University, Weihai 264209, China
3.
School of Space Science and Physics, Shandong University, Weihai 264209, China

Funds:

National Natural Science Foundation of China 41604027

National Natural Science Foundation of China 41604003

National Natural Science Foundation of China 42074028

Open Fund of Qingdao National Laboratory of Marine Science and Technology QNLM2016ORP0401

the Fundamental Research Funds for the Central Universities 18CX02054A

More Information

Corresponding author: HE Kaifei, E-mail: kfhe@upc.edu.cn

摘要

摘要:
为了探究GNSS L1波段中信号不同调制方式的GNSS-R码相位延迟海面的测高性能，开展了双天线岸基GNSS-R海面测高实验，收集了采样率为40 MHz的原始中频数据。利用自主开发的GNSS-R测高软件接收机和反演软件对实验数据进行了处理分析，同时获得了基于QZSS L1C/A码和L1C码的GNSS-R海面测高结果，并分别与岸基同步观测的雷达高度计的测高值进行对比，以对反演结果进行精度评定。实验结果表明：基于QZSS L1C/A码和L1C码的海面测高精度最优可达0.63 m和0.4 m，L1C码的延迟GNSS-R测高精度明显高于L1C/A码。此外，GNSS-R测高精度会随着卫星高度角的增加而有所增加。
- GNSS-R /
- QZSS /
- L1C /
- L1C/A /
- 测高
Abstract:
In order to explore the altimetry performance of GNSS-R code phase delay measurement with different modulation methods in GNSS LI band signals, a coastal dual-antenna GNSS-R ocean altimetry experiment was carried out, and the original intermediate frequency data with a sampling rate of 40 MHz was collected. The experimental data was processed using the self-developed GNSS-R altimetry software receiver and inversion software, and the GNSS-R ocean altimetry results of QZSS L1C/A code and L1C code were obtained simultaneously. Then we compare them with the measured values of the radar altimeter that were simultaneously observed coastally, and used to evaluate the accuracy of the GNSS-R inversion result. The experimental results show that the ocean altimetry accuracy based on L1C/A code and L1C code is about 0.63 m and 0.4 m, respectively. It can be seen that the GNSS-R measurement accuracy of the L1C code delay is significantly higher than that of the L1C/A code. In addition, the accuracy of GNSS-R will be improved as the satellite elevation increases gradually.
- GNSS-R /
- QZSS /
- L1C /
- L1C/A /
- altimetry

HTML全文

图 1 岸基测高几何模型

Figure 1. Coastal altimetry geometric model

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图 2 L1C/A码和L1C码自相关函数

Figure 2. Autocorrelation function of L1C/A and L1C code

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图 3 射频前端处理流程

Figure 3. Processing flow of RF front-end

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图 4 GNSS-R软件接收机处理流程

Figure 4. Processing flow of GNSS-R software receiver

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图 5 实验场地及设备位置

Figure 5. Experimental site and equipment location

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图 6 L1C/A码和L1C码相关功率波形对比

Figure 6. Correlation power waveform comparison between L1C/A and L1C code

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图 7 J1、J2、J3卫星高度角变化(北京时间)

Figure 7. J1, J2 and J3 satellite elevation changes(Beijing time)

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图 8 L1C/A和L1C码GNSS-R测高结果对比

Figure 8. Comparison of L1C/A and L1C code GNSS-Raltimetry results

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图 9 J2、J3岸基测高结果残差序列对比

Figure 9. Comparison of residual sequence of coastal altimetry results of J2 and J3 satellites

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图 10 J1、J3码延迟岸基测高结果残差序列对比

Figure 10. Comparison of residual sequence of code delay coastal altimetry results of J1 and J3 satellites`

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表 1 L1C/A码和L1C码信号结构

Table 1. Signal structures of L1C/A and L1C code

信号类型	信号分量	载波频率/MHz	码率/MHz	调制方式	码长	功率比
L1C/A	数据	1 575.42	1.023	BPSK	1 023
L1C	数据	1 575.42	1.023	BOC (1, 1)	10 230	1/4
L1C	导频	1 575.42	1.023	TMBOC (6, 1, 4/33)	10 230	3/4

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表 2 J1、J2、J3码延迟和岸基测高结果精度对比

Table 2. Comparison of the accuracy of code delay coastal altimetry results of J1, J2 and J3 satellites

观测类型	时刻	PRN	均方根误差/m	标准差/m	最大误差/m	最小误差/m
L1C/A	8:00—10:00	J2	0.917	0.908	2.977	-2.937
L1C/A		J3	0.634	0.597	2.134	-2.673

L1C		J2	0.695	0.514	2.602	-2.341
L1C		J3	0.563	0.313	1.527	-0.609

L1C/A	13:30—15:00	J1	1.226	0.855	2.985	-1.728
L1C/A		J3	0.794	0.618	2.891	-1.977

L1C		J1	0.726	0.391	1.846	-0.701
L1C		J3	0.395	0.226	1.164	-0.643

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