GLONASS ≈ GLONASS
View article
Assessment of Dual Frequency GNSS Observations from a Xiaomi Mi 8 Android Smartphone and Positioning Performance Analysis Open
On May 2018 the world’s first dual-frequency Global Navigation Satellite System (GNSS) smartphone produced by Xiaomi equipped with a Broadcom BCM47755 chip was launched. It is able to receive L1/E1/ and L5/E5 signals from GPS, Galileo, Bei…
View article
The 6 September 2017 X‐Class Solar Flares and Their Impacts on the Ionosphere, GNSS, and HF Radio Wave Propagation Open
On 6 September 2017, the Sun emitted two significant solar flares (SFs). The first SF, classified X2.2, peaked at 09:10 UT. The second one, X9.3, which is the most intensive SF in the current solar cycle, peaked at 12:02 UT and was accompa…
View article
Review of code and phase biases in multi-GNSS positioning Open
A review of the research conducted until present on the subject of Global Navigation Satellite System (GNSS) hardware-induced phase and code biases is here provided. Biases in GNSS positioning occur because of imperfections and/or physical…
View article
A Survey on Coping With Intentional Interference in Satellite Navigation for Manned and Unmanned Aircraft Open
Intentional interference in satellite navigation is becoming an increasing threat for modern systems relying on Global Navigation Satellite Systems (GNSS). In particular, critical applications such as aviation can be severely affected by u…
View article
Multi-GNSS precise point positioning for precision agriculture Open
The main objective of this research was to examine the feasibility of Multi-GNSS precise point positioning (PPP) in precision agriculture (PA) through a series of experiments with different working modes (i.e. stationary and moving) under …
View article
GPS and GLONASS observations of large‐scale traveling ionospheric disturbances during the 2015 St. Patrick's Day storm Open
Using a comprehensive database of ~5300 ground‐based Global Navigation Satellite Systems (GNSS) stations we have investigated large‐scale traveling ionospheric disturbances (LSTIDs) during 17–18 March 2015 (St. Patrick's Day storm). For th…
View article
Precise GNSS Positioning Using Smart Devices Open
The recent access to GNSS (Global Navigation Satellite System) phase observations on smart devices, enabled by Google through its Android operating system, opens the possibility to apply precise positioning techniques using off-the-shelf, …
View article
Statistical Comparison and Combination of GPS, GLONASS, and Multi-GNSS Multipath Reflectometry Applied to Snow Depth Retrieval Open
peer reviewed
View article
A Review on Multi-GNSS for Earth Observation and Emerging Applications Open
Global Navigation Satellite System (GNSS) has drawn the attention of scientists and users all over the world for its wide-ranging Earth observations and applications. Since the end of May 2022, more than 130 satellites are available for fu…
View article
Global Ionospheric Modelling using Multi-GNSS: BeiDou, Galileo, GLONASS and GPS Open
The emergence of China’s Beidou, Europe’s Galileo and Russia’s GLONASS satellites has multiplied the number of ionospheric piercing points (IPP) offered by GPS alone. This provides great opportunities for deriving precise global ionospheri…
View article
Position Accuracy Improvement by Implementing the DGNSS-CP Algorithm in Smartphones Open
The position accuracy of Global Navigation Satellite System (GNSS) modules is one of the most significant factors in determining the feasibility of new location-based services for smartphones. Considering the structure of current smartphon…
View article
Assessment of Multiple GNSS Real-Time SSR Products from Different Analysis Centers Open
The real-time State Space Representation (SSR) product of the GNSS (Global Navigation Satellite System) orbit and clock is one of the most essential corrections for real-time precise point positioning (PPP). In this work, the performance o…
View article
A Survey of GNSS Spoofing and Anti-Spoofing Technology Open
With the development of satellite navigation technology, the research focus of GNSS has shifted from improving positioning accuracy to expanding system application and improving system performance. At the same time, improving the survivabi…
View article
GPS and GLONASS observable-specific code bias estimation: comparison of solutions from the IGS and MGEX networks Open
Different from differential code biases, the observable-specific code biases (OSBs) directly describe the biases of individual pseudorange measurements, which provide full flexibilities for multi-GNSS code biases handling. We present the m…
View article
Evaluation of Ionospheric Delay Effects on Multi-GNSS Positioning Performance Open
Ionospheric delay is a significant error source in multi-GNSS positioning. We present different processing strategies to fully exploit the ionospheric delay effects on multi-frequency and multi-GNSS positioning performance, including stand…
View article
Evolution of orbit and clock quality for real-time multi-GNSS solutions Open
High-quality satellite orbits and clocks are necessary for multi-GNSS precise point positioning and timing. In undifferenced GNSS solutions, the quality of orbit and clock products significantly influences the resulting position accuracy; …
View article
Maritime Moving Target Localization Using Passive GNSS-Based Multistatic Radar Open
This paper examines the potential in extracting the instantaneous location of maritime moving targets using a passive multistatic radar with Global Navigation Satellite Systems (GNSS) as illuminators of opportunity and a single receiver. T…
View article
Comprehensive assessment of real-time precise products from IGS analysis centers Open
Real-Time Precise Point Positioning (RT-PPP) has been one of the research hotspots in GNSS (Global Navigation Satellite System) community for decades. Real-time precise products of satellite orbits and clocks are the prerequisite for RT-PP…
View article
Overview of CODE’s MGEX solution with the focus on Galileo Open
We present an update on the multi-GNSS orbit and clock solution (COM), the CODE analysis center provides to the International GNSS service (IGS) in the frame of the multi-GNSS extension (MGEX). In recent years substantial progress was achi…
View article
3Cat-2—An Experimental Nanosatellite for GNSS-R Earth Observation: Mission Concept and Analysis Open
Global navigation satellite system reflectometry is a multistatic radar using navigation signals as signals of opportunity. It provides wide-swath and improved spatiotemporal sampling over current space-borne missions. The lack of experime…
View article
Single-Baseline RTK Positioning Using Dual-Frequency GNSS Receivers Inside Smartphones Open
Global Navigation Satellite System (GNSS) positioning is currently a common practice thanks to the development of mobile devices such as smartphones and tablets. The possibility to obtain raw GNSS measurements, such as pseudoranges and car…
View article
Characterization of GNSS observations from a Nexus 9 Android tablet Open
Global navigation satellite system (GNSS) raw data were made available in the application programming interface (API) starting from version 7.0 of the Android operating system. This opens possibilities for precise positioning with Android …
View article
Real-time multi-GNSS single-frequency precise point positioning Open
Precise Point Positioning (PPP) is a popular Global Positioning System (GPS) processing strategy, thanks to its high precision without requiring additional GPS infrastructure. Single-Frequency PPP (SF-PPP) takes this one step further by no…
View article
Spoofing Detection Using GNSS/INS/Odometer Coupling for Vehicular Navigation Open
Location information is one of the most vital information required to achieve intelligent and context-aware capability for various applications such as driverless cars. However, related security and privacy threats are a major holdback. Wi…
View article
Weighting of Multi-GNSS Observations in Real-Time Precise Point Positioning Open
The combination of Global Navigation Satellite Systems (GNSS) may improve the accuracy and precision of estimated coordinates, as well as the convergence time of Precise Point Positioning (PPP) solutions. The key conditions are the correct…
View article
Integrating GPS with GLONASS for high‐rate seismogeodesy Open
High‐rate GPS is a precious seismogeodetic tool to capture coseismic displacements unambiguously and usually improved by sidereal filtering to mitigate multipath effects dominating the periods of tens of seconds to minutes. We further intr…
View article
Tightly-Coupled Integration of Multi-GNSS Single-Frequency RTK and MEMS-IMU for Enhanced Positioning Performance Open
Dual-frequency Global Positioning System (GPS) Real-time Kinematics (RTK) has been proven in the past few years to be a reliable and efficient technique to obtain high accuracy positioning. However, there are still challenges for GPS singl…
View article
Principle and performance of multi-frequency and multi-GNSS PPP-RTK Open
PPP-RTK which takes full advantages of both Real-Time Kinematic (RTK) and Precise Point Positioning (PPP), is able to provide centimeter-level positioning accuracy with rapid integer Ambiguity Resolution (AR). In recent years, with the dev…
View article
Tropospheric delay parameters from numerical weather models for multi-GNSS precise positioning Open
The recent dramatic development of multi-GNSS (Global Navigation Satellite System) constellations brings great opportunities and potential for more enhanced precise positioning, navigation, timing, and other applications. Significant impro…
View article
3-D Water Vapor Tomography in Wuhan from GPS, BDS and GLONASS Observations Open
Three-dimensional water vapor can be reconstructed from Global Navigation Satellite System (GNSS) observations, which can study 3-D profile variations of atmospheric water vapor and climate. However, there is a large uncertainty of water v…