Tianmu-1 Constellation GNSS-R In-Orbit Performance: Spatiotemporal Characteristics, Product Applications, and Polarimetric Features

被引：0

作者：

Huang, Feixiong ^{[1
,2
]}

Yin, Cong ^{[1
,2
]}

Liu, Yan ^{[3
]}

Sun, Yueqiang ^{[1
,2
]}

Xia, Junming ^{[1
,2
]}

Bai, Weihua ^{[1
,2
]}

Tang, Qi ^{[4
]}

Wang, Xianyi ^{[1
,2
]}

Du, Qifei ^{[1
,2
]}

Cai, Yuerong ^{[1
,2
]}

Wang, Zhuoyan ^{[1
,2
]}

Liu, Cheng ^{[1
,2
]}

Zhang, Hao ^{[1
,2
]}

Hu, Peng ^{[1
,2
]}

Wu, Ruhan ^{[1
,2
]}

Tan, Guangyuan ^{[1
,2
]}

Qiao, Hao ^{[1
,2
]}

Li, Fu ^{[1
,2
]}

Liu, Congliang ^{[1
,2
]}

Meng, Xiangguang ^{[1
,2
]}

Hu, Xiuqing ^{[5
]}

机构：

[1] Chinese Acad Sci, Natl Space Sci Ctr, Beijing Key Lab Space Environm Explorat, Beijing 100190, Peoples R China

[2] Univ Chinese Acad Sci, Beijing 100049, Peoples R China

[3] China Meteorol Adm, Ctr Earth Syst Modeling & Predict, Beijing 100081, Peoples R China

[4] Aerosp Tianmu Chongqing Satellite Sci & Technol Co, Chongqing 401332, Peoples R China

[5] China Meteorol Adm, Natl Satellite Meteorol Ctr, Beijing 100081, Peoples R China

来源：

IEEE TRANSACTIONS ON GEOSCIENCE AND REMOTE SENSING | 2025年 / 63卷

关键词：

Global Positioning System; Satellite broadcasting; Global navigation satellite system; Orbits; Satellite antennas; Space vehicles; Sea surface; Sea ice; Remote sensing; Payloads; Global Navigation Satellite System Reflectometry (GNSS-R); GNOS-mini (GNOS-M); polarimetry; remote sensing; small satellite; CYGNSS; SYSTEM;

D O I：

10.1109/TGRS.2025.3581343

中图分类号：

P3 [地球物理学]; P59 [地球化学];

学科分类号：

0708 ; 070902 ;

摘要：

This article introduces the Chinese Tianmu-1 Global Navigation Satellite System Reflectometry (GNSS-R) constellation of 22 small satellites launched in 2023-2024 and comprehensively evaluates the latest version of the in-orbit data. First, the mission design and instrument technology are described, which largely builds on the FengYun-3/GNOS-II missions. Notable innovations include full GNSS compatibility and dual-polarization antenna. Then, the spatiotemporal characteristics of the constellation are analyzed-specifically, coverage percentage (CP) and mean revisit time at different latitudes. Next, the accuracy of its science products including ocean surface winds and land soil moisture has been assessed, with two application cases demonstrating the mission's utility for monitoring tropical cyclones (TCs) and flooding. Finally, this article, for the first time, evaluates Tianmu's polarized observations including horizontal (H), vertical (V), left-hand circularly polarized (LHCP), and right-hand circularly polarized (RHCP). Analysis of the signal-to-noise ratio (SNR) and reflectivity shows that the dual-polarimetric observations follow the trend of theoretical models and hold promise for advancing land remote sensing.

引用

页数：20

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