基于TechDemoSat-1卫星的GPS反射信号海面高度反演

张云; 马德皓; 孟婉婷; 郑俏; 杨树瑚

doi:10.13700/j.bh.1001-5965.2020.0357

基于TechDemoSat-1卫星的GPS反射信号海面高度反演

doi: 10.13700/j.bh.1001-5965.2020.0357

1.
上海海洋大学信息学院, 上海 201306
2.
上海航天电子技术研究所, 上海 201109

基金项目:

国家自然科学基金 41376178

国家自然科学基金 41401489

详细信息

通讯作者:
杨树瑚, E-mail: shyang@shou.edu.cn

中图分类号: P228.4
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- 被引次数: 0
出版历程
- 收稿日期: 2020-07-24
- 录用日期: 2020-10-16
- 网络出版日期: 2021-10-20

Sea surface height inversion of GPS reflected signal based on TechDemoSat-1 satellite

1.
College of Information Technology, Shanghai Ocean University, Shanghai 201306, China
2.
Shanghai Aerospace Electronic Technology Institute, Shanghai 201109, China

Funds:

National Natural Science Foundation of China 41376178

National Natural Science Foundation of China 41401489

More Information

Corresponding author: YANG Shuhu E-mail: shyang@shou.edu.cn

摘要

摘要:
针对星载GPS反射信号（GPS-R）海面测高的误差问题，基于星载GPS-R实测数据进行星载海面测高模型和误差修正模型的研究，并验证其有效性。利用TechDemoSat-1（TDS-1）数据，使用时延多普勒图（DDM）海面高度反演技术，着重分析了星载GPS-R海面高度反演中的各类误差，并建立了相应的误差模型。对星载GPS-R海面高度反演模型进行优化，采用DTU15全球平均海面模型、DTU全球海潮模型验证反演精度。结果证明：优化后反演模型得到的全球海面高度反演结果的平均绝对误差（MAD）为6.05 m，精度提高了约29%，有效提高了海面高度反演的精度。研究成果对于推广星载GNSS反射信号（GNSS-R）的海面测高应用具有一定的意义。
- GNSS反射信号(GNSS-R) /
- 星载 /
- 海面高度反演 /
- 精度分析 /
- TechDemoSat-1(TDS-1)
Abstract:
The problems of using GPS-Reflectometry (GPS-R) measured data to establish satellite-borne sea surface height inversion model are studied and its validity is verified. The data of TechDemoSat-1 (TDS-1) and the retrieval technique of Delay-Doppler Map (DDM) were used to analyze the errors in the retrieval of satellite-borne GPS-R sea surface height, and the error models were established. The satellite-borne GPS-R sea surface height inversion model was optimized. Meanwhile, the DTU15 global mean sea surface and sea tide model was adopted to verify the inversion accuracy. The results show that the Mean Absolute Deviation (MAD) of the global sea surface height inversion results obtained by the optimized inversion model is 6.05 meters, and the accuracy is improved by about 29%, effectively improving the accuracy of SST inversion. The research results have certain significance for promoting the application of spaceborne GNSS-Reflectometry (GNSS-R) in sea surface height inversion.
- GNSS-Reflectometry (GNSS-R) /
- satellite-borne /
- sea surface height inversion /
- precision analysis /
- TechDemoSat-1 (TDS-1)

HTML全文

图 1 星载GPS-R海面高度反演几何原理

Figure 1. Geometric principles of satellite-borne GPS-R sea surface height inversion

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图 2 影响GPS-R信号的主要误差

Figure 2. Main errors affecting GPS-R signal

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图 3 考虑接收机和发射机运动的几何模型

Figure 3. Geometric model considering receiver motion and transmitter motion

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图 4 TDS-1数据处理流程

Figure 4. TDS-1 data processing flow

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图 5 DDM示例

Figure 5. An example of DDM

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图 6 归一化能量值插值后多普勒频率为零的切片

Figure 6. Slice with zero Doppler frequency after normalized energy interpolation

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图 7 误差修正前后的结果对比

Figure 7. Comparison of results before and after error correction

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图 8 测量的平均海面高度(南大西洋海域)

Figure 8. Mean sea surface height measurement(South Atlantic)

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图 9 验证模型的平均海面高度(南大西洋海域)

Figure 9. Mean sea surface height of verification model(South Atlantic)

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图 10 反演得到的全球平均海面高度误差统计

Figure 10. Error statistics of global average sea surface height obtained by retrieval

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表 1 TDS-1卫星参数

Table 1. Parameters of satellite TDS-1

参数	数值
天线极化	天顶天线(L1/L2)、天底天线
采样率/MHz	16.367
轨道高度/km	635
轨道倾角/(°)	98.4

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表 2 误差因素及补正方法

Table 2. Error factors and correction methods

误差项	延迟误差绝对值/m	补正方法
电离层	< 15	国际参考电离层模型
对流层	< 7	大气延迟模型
天基线姿态误差	< 1	TDS-1 Metadata数据
GPS卫星轨道误差	< 3	SP3精密星历
TDS-1卫星轨道误差	< 2	TDS-1 Metadata数据
反射信号延迟误差	< 10	反射信号几何模型
TDS-1卫星数据偏差	< 50	TDS-1 Metadata数据
海面粗糙度	< 10	HALF方法

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表 3 筛选参数及范围

Table 3. Filter parameters and scope

参数	保留数据范围
信噪比/dB	>-5
天线增益/dB	>5
仰角/(°)	>60

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