199 Result(s)
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Article
Characteristics of Beidou-2 flex power and its impact on precise point positioning with ambiguity resolution
The modernization of the Global Navigation Satellite Systems (GNSS) has brought many new features and capabilities, one of which is programmable power output capability, also known as flex power. Flex power ca...
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Article
M_IFCB: a MATLAB-based software for multi‑GNSS inter‑frequency clock bias estimation and forecast
To address the lack of publicly available inter-frequency clock bias (IFCB) products and the impact of IFCB on real-time or near-real-time multi-frequency precision positioning, a MATLAB-based software for mul...
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Article
Stochastic characteristics analysis on GNSS observations and real-time ROTI-based stochastic model compensation method in the ionospheric scintillation environment
Ionospheric scintillation interferes with the global navigation satellite system (GNSS) observation precision by random diffractive residuals, leading the elevation-dependent stochastic model to be invalid for...
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Article
A grid model of direct conversion between zenith tropospheric delay and precipitable water vapor in tropical regions
Accurately measuring precipitable water vapor (PWV) is challenging, especially in the absence of the measured meteorological data. We propose a novel grid model, CZP, that directly converts zenith tropospheric...
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Article
Open AccessEffects of equatorial plasma bubble-induced ionospheric gradients on GNSS PPP-RTK
Equatorial plasma bubble (EPB) exerts a severe threat to global navigation satellite system (GNSS) technique. It not only can lead to ionospheric scintillation, but also can create strong plasma gradients in i...
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Article
Single-station single-frequency GNSS cycle slip estimation with receiver clock error increment and position increment constraints
Cycle slip detection is essential for achieving centimeter-level positioning using Global Navigation Satellite Systems (GNSS). However, when dealing with single-frequency data, it is impossible to utilize obse...
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Article
Real-time GNSS meteorology: a promising alternative using real-time PPP technique based on broadcast ephemerides and the open service of Galileo
Global Navigation Satellite System (GNSS) meteorology, in which the zenith total delay (ZTD) and precipitable water vapor (PWV) are retrievable from GNSS signals, is a well-established tool for weather and cli...
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Article
GNSS spoofing detection method based on the intersection angle between two directions of arrival (IA‑DOA) for single-antenna receivers
The application field of global navigation satellite systems continues to expand, and their security and stability have received widespread attention. Navigation spoofing has the characteristics of solid conce...
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Article
Facilitated interferometric reflectometry evaluation and its application in monitoring three typhoon storm surges in Hong Kong with multi-GNSS constellation
In recent years, the potential of Global Navigation Satellite System Interferometric Reflectometry (GNSS-IR) for monitoring sea-level variations has been explored extensively. However, most studies have typica...
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Improving performances of GNSS positioning correction using multiview deep reinforcement learning with sparse representation
High-accuracy GNSS positioning in urban environments is important for applications like safe autonomous driving, however, dynamic errors in complex urban environments limit positioning performances. Recently, ...
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Article
Real-time regional tropospheric wet delay modeling and augmentation performance for triple-frequency PPP/PPP-IAR during typhoon weather
Troposphere augmentation is of great importance for global navigation satellite system (GNSS) real-time precise point positioning (PPP) service. This contribution focuses on the feasibility of modeling the reg...
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Article
A Wasserstein distance-based technique for the evaluation of GNSS error characterization
The characteristics of residual errors in GNSS positioning are crucial for fault detection and integrity monitoring. Despite the wide use of the zero-mean Gaussian assumption in the navigation community, studi...
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Article
On the contributions of refined thermal expansion model to nonlinear variations in different GNSS height time series products
The thermal expansion effect exhibited by the GNSS monument and their nearby bedrock due to surface temperature variations is an important factor affecting the nonlinear variation of GNSS height. However, curr...
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Article
A new LSTM-based model to determine the atmospheric weighted mean temperature in GNSS PWV retrieval
The atmospheric weighted mean temperature (Tm) is a key parameter in determining the precipitable water vapor (PWV). Conventional meteorological parameter empirical models have a lower spatial resolution and poor...
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Article
Open AccessAn effective automatic processing engine for improving the multi-GNSS constellation precise orbit prediction
Orbit prediction (OP) recently tends to be a very crucial step for supporting real-time GNSS orbit services due to the dynamic stability of navigation satellite orbits. The OP performance depends on the length...
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Article
Open AccessUsing geodetic measurements derived terrestrial water storage to investigate the characteristics of drought in Yunnan, China
The use of the global navigation satellite system (GNSS) for monitoring changes in terrestrial water storage (TWS) is growing. However, the density of GNSS stations is sparse in most areas, and the widely used...
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Article
Detection and mitigation of time synchronization attacks based on long short-term memory neural network
Due to its wide-area and high-precision advantages, Global Navigation Satellite System (GNSS) timing is widely employed in critical infrastructures such as power, communication and transportation, maintaining ...
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Article
Evaluation of different constrained LAMBDAs for low-cost GNSS attitude determination in an urban environment
Complex urban environments limit the reception of global navigation satellite system (GNSS) signals, increasing the difficulty of ambiguity resolution (AR) for GNSS attitude determination based on carrier-phas...
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Article
Rapid detection of GNSS time synchronization attacks via the enhanced code and carrier Doppler consistency test
Many critical infrastructures, such as smart grids, communication systems, and industrial networks, rely on the global navigation satellite system (GNSS) to ensure accurate time synchronization. However, the v...
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Article
Monitoring surface subsidence in permafrost using BDS interferometric reflectometry
The freeze–thaw cycle of the active layer in permafrost areas can cause obvious surface deformation. Global navigation satellite system interferometric reflectometry (GNSS-IR) technology has been successfully ...
