GPS Solutions

Global Navigation Satellite System fast precise positioning can be achieved with accurate ionospheric corrections computed from an adequate number of GNSS stations in a local region. In low-latitude regions, the presence of electron density ...

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 multi-GNSS IFCB estimation and forecast (...

A growing threat for Global Navigation Satellite System (GNSS) service is Radio Frequency Interference (RFI). An important class of GNSS RFI signatures is time dependent frequency pattern signals, generically termed here as chirp signals radiated ...

An open source software package has been developed for Global Navigation Satellite Systems (GNSS) interferometric reflectometry. The gnssrefl package is written in python; it can be installed from the source code, the python packaging index ...

The Receiver Autonomous Integrity Monitoring (RAIM) technique is very important for the GNSS receiver to detect faulty measurement sources before they mislead the positioning solution. Based on the parity RAIM method, a simple algorithm to detect ...

The global navigation satellite system’s signals are frequently obstructed in complex environments, and the carrier phase is prone to experiencing large cycle slips; hence, phase prediction becomes necessary. However, the current phase prediction ...

The application of global navigation satellite system in vehicle navigation imposes high requirements on its safety, which makes it extremely important to detect deceptive interference (DI). The integration of prior road position information is ...

Global navigation satellite system reflectometry (GNSS-R) has emerged as a pivotal remote sensing (RS) technology, widely utilized for retrieving crucial oceanic parameters such as wind speed, sea surface height, and sea ice detection. However, ...

The CentipedeRTK network is a collaborative Global Navigation Satellite System (GNSS) network launched in 2019, consisting mainly of low-cost GNSS receivers and antennas. This network enables free Real-Time Kinematic (RTK) positioning with ...$\mathrm{}\mathrm{}$$\mathrm{}\mathrm{}$$\mathrm{}\mathrm{}$$\mathrm{}\mathrm{}$$\mathrm{}\mathrm{}$$\mathrm{}\mathrm{}$$_{}^{\mathrm{}}$$\mathrm{}\mathrm{}$$_{}^{\mathrm{}}$

Global Navigation Satellite Systems (GNSS) tropospheric tomography is a commonly used technique for the reconstruction of three-dimensional water vapour field, and a priori vertical constraint models are required for water vapour density (WVD) ...

Slow Slip Events (SSEs) are like long-duration slow earthquakes during which stress is gradually released over several days to months, and a comprehensive catalog of SSEs is essential for a better understanding of the earthquake cycle. However, ...

The ionosphere shows regular changes such as daily, 27 days, seasonal, semi-annual, annual, and 11 years. These changes can be modeled and their effects largely determined. However, in addition to regular changes, irregular changes occur in the ...

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 capability allows for an increase in the ...

Multipath effect is one of the major challenges for Global Navigation Satellite Systems (GNSS) to achieve millimeter-level high-precision positioning and orbit determination. Wavelet Transform (WT) and Sidereal Filtering (SF) can effectively ...

In recent years, Global Navigation Satellite Systems (GNSSs) have become integral to our daily lives because of their precise positioning and navigation capabilities. Widespread use of smartphones equipped with GNSS receivers results in the ...

Galileo supports global precise point positioning (PPP) service by delivering precise products via satellites, which is known as high accuracy service (HAS). To improve reception efficiency, the Galileo HAS employs a high-parity vertical reed-...

Unmodeled errors materially affect the float solutions of both ambiguities and coordinates in global navigation satellite systems (GNSS), and thus also the fixed solution. Recently, extensive attempts have been made to guarantee the reliability of ...

We examine the decadal evolution of GPS, GLONASS, and Galileo satellite orbital elements, including the semi-major axis, inclination, eccentricity, right ascension of the ascending node, and the argument of perigee. We focus on the long-term ...

Sea surface salinity (SSS) is crucial to the marine ecosystem. Soil Moisture and Ocean Salinity (SMOS) establishes a geophysical modeling function (GMF) between sea surface brightness temperature (BT) and SSS, which incorporates sea surface wind ...

This work evaluates the capability of a low-cost smartphone to measure variations in water level caused by astronomical tide and storm surges along the coast of Buenos Aires, Argentina, over a period of 27 months, employing the GNSS-IR technique. ...

The radio navigation satellite system (RNSS) timing has been widely used in crucial power systems. However, the problem of RNSS service vulnerability to interference and spoofing significantly affects its application. The phasor measurement unit ...

The Solution INdependent EXchange (SINEX) file format, an international standard for the exchange of information, is essential in the Global Navigation Satellite System (GNSS) processing strategies that integrate different software applications. ...

GNSS (Global Navigation Satellite Systems) tropospheric delay, specifically zenith wet delay (ZWD), shows clear spatial–temporal variations and is usually modeled as RWPN (random walk process noise). However, because RWPN does not take the ...$\mathrm{}\sqrt{}$

Factor graph optimization has been widely used for state estimation in robotic SLAM community. Extensive algorithms have been proposed for camera/LiDAR/INS based SLAM. However, GNSS positioning based on factor graph optimization is limited, which ...

This study proposes a new concept of carrier-phase-based satellite augmentation system named “Compact Real-time Kinematic for Expanded Area (COREA),” which provides centimeter-level positioning services across nationwide coverage. The proposed ...

The Inter-Satellite Link (ISL) technology plays a vital role in BeiDou Navigation Satellite System (BDS), and it’s a developmental trend of the future GNSS. However, ISL is insensitive to both the Earth’s rotation and the constellation’s overall ...

This paper proposes a 2D notch generator algorithm based on frequency-invariant (FI)-shaped beampattern synthesis for the Global Navigation Satellite System (GNSS) space–time anti-jamming blind null-steering mode. Unlike conventional blind null-...

Spoofing is becoming a prevalent threat to the users of Global Navigation Satellite Systems (GNSS). It is important to deepen our understanding of spoofing attacks and develop resilient techniques to effectively combat this threat. Detecting and ...

Zenith Tropospheric Delay (ZTD) is one of the main atmospheric errors in the Global Navigation Satellite System (GNSS). In this study, we propose a novel ZTD forecasting model based on the deep-learning method named Informer-based ZTD (IBZTD) ...