Water Surface Altimetry Using BD-3 B2a Reflected Signal

WANG Dongwei; SUN Yueqiang; WANG Xianyi; BAI Weihua; XIA Junming; DU Qifei; CAI Yuerong; MENG Xiangguang; WU Chunjun; LIU Cheng; QIAO Hao; LI Fu

doi:10.13203/j.whugis20200278

Volume 42 Issue 11

Nov. 2022

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Geomatics and Information Science of Wuhan University > 2022 > 47(11): 1878-1886. > DOI: 10.13203/j.whugis20200278

WANG Dongwei, SUN Yueqiang, WANG Xianyi, BAI Weihua, XIA Junming, DU Qifei, CAI Yuerong, MENG Xiangguang, WU Chunjun, LIU Cheng, QIAO Hao, LI Fu. Water Surface Altimetry Using BD-3 B2a Reflected Signal[J]. Geomatics and Information Science of Wuhan University, 2022, 47(11): 1878-1886. DOI: 10.13203/j.whugis20200278

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Water Surface Altimetry Using BD-3 B2a Reflected Signal

WANG Dongwei^{1, 2, 3, 4, 5,},
SUN Yueqiang^{1, 2, 3, 4, 5},
WANG Xianyi^{1, 2, 3, 4, 5, ,},
BAI Weihua^{1, 2, 3, 4, 5},
XIA Junming^{1, 2, 3, 4, 5},
DU Qifei^{1, 2, 3, 4},
CAI Yuerong^{1, 2, 3, 4},
MENG Xiangguang^{1, 2, 3, 4},
WU Chunjun^{1, 2, 3, 4},
LIU Cheng^{1, 2, 3, 4},
QIAO Hao^{1, 2, 3, 4},
LI Fu^{1, 2, 3, 4}

1.
National Space Science Center, Chinese Academy of Sciences, Beijing 100190, China
2.
Beijing Key Laboratory of Space Environment Exploration, Beijing 100190, China
3.
Key Laboratory of Environmental Space Situation Awareness Technology, Chinese Academy of Sciences, Beijing 100190, China
4.
Joint Laboratory on Occultations for Atmosphere and Climate, Beijing 100190, China
5.
University of Chinese Academy of Sciences, Beijing 100190, China

Funds:

The National Natural Science Foundation of China 41775034

The National Natural Science Foundation of China 41405040

The National Natural Science Foundation of China 41505030

The National Natural Science Foundation of China 41606206

The National Natural Science Foundation of China 41405039

the Scientific Research Project of the Chinese Academy of Sciences YZ201129

Youth Innovation Promotion Association, CAS 2018180

More Information

Author Bio:
WANG Dongwei, PhD, senior engineer, specializes in GNSS remote sensing application research and receiver design. E-mail:wangdongwei@nssc.ac.cn
Corresponding author:
WANG Xianyi, PhD, professor. E-mail: wxy@nssc.ac.cn
Received Date: July 25, 2020
Available Online: November 15, 2022
Published Date: November 04, 2022

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Abstract

Abstract

Objectives The B2a is a new signal of BeiDou-3(BD-3) with high-bandwidth and high pseudorange measurement precision, therefore, it is suitable for GNSS-R water surface altimetry. There were few studying based on the BD-3 reflected signal, due to the BD-3 system just began to provide worldwide services in the past two years.
Methods The National Space Science Center (NSSC) has developed a GNSS-R receiver with independent intellectual property supporting the BD-3 B2a capture and tracking functions, which can obtain and track both direct and reflected B2a signals. B2a signals are difficult to capture due to its long PRN code. One B2a assistant approach is proposed and implemented that the shorter B1I signals are first obtained and tracked, then the B2a signals can be correctly captured using B1I auxiliary information with shorter acquisition time. One cross calibration system is included by the receiver, which can effectively eliminate the system biases caused by the delays of different cables and receiver channels.
Results During the shore-based experiment carried out at Huairou in Beijing in 2019, the correlation waveforms of the BD-3 B2a, BD-2 B1I and GPS L1 C/A reflected signals were accumulated. The water surface height was successfully retrieved and the systematic biases was eliminated effectively. The water surface height results show that the inversion precision based on BD-3 B2a reaches 5.9 cm with the non-coherent integration time of 30 s.
Conclusions The height precision has been improved by 13 cm than BD-2 B1I signal and 20 cm than GPS L1 C/A signal. This verification experiment expands the application research of BD-3 system in GNSS-R water surface altimetry and lays the foundation for the development of subsequent tasks.
- GNSS-R,
- BD-3,
- B2a,
- water surface altimetry,
- cross calibration

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