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GNSS code and carrier phase observations of a Huawei P30 smartphone: quality assessment and centimeter-accurate positioning
In 2016, an application programming interface was added to the Android operating systems, which enables the access of GNSS raw observations. Since...
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Sub-10–16 accuracy GNSS frequency transfer with IPPP
Precise point positioning (PPP) using dual-frequency GNSS code and phase measurements has been the technique of choice for time and frequency...
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Combining the GPS/Galileo/BDS-3 signals on overlap frequencies for interoperable multipath hemispherical maps
Multipath remains one of the major challenges in high-precision GNSS positioning. The multipath hemispherical map (MHM) based on satellites’ location...
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Assessing the quality of raw GNSS observations and 3D positioning performance using the **aomi Mi 8 dual-frequency smartphone in Northwest Mexico
GNSS observations from smartphones have gained popularity in recent years due to the high precision achieved in various applications. While most...
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A PPP kinematic application on historical GPS data: the reprocessing of the ITASE98-99 Antarctica mission height profiles
The analysis of altimetric profiles in Antarctica and their evolution over the years is a sensitive topic for the scientific community since it helps...
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Spatial–temporal characteristic of BDS phase delays and PPP ambiguity resolution with GEO/IGSO/MEO satellites
GPS precise point positioning (PPP) ambiguity resolution (AR) can improve the positioning accuracy and shorten the convergence time. However, for the...
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Calibration and analysis of BDS receiver-dependent code biases
Different designs of receiver correlators and front ends will cause different biases in terms of the pseudorange. In this paper, we present an...
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Initial and comprehensive analysis of PPP time transfer based on Galileo high accuracy service
European Galileo officially provided global users with the initial high accuracy service (HAS) through Galileo satellites for free on January 24,...
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Estimating the orbit error of BeiDou GEO satellites to improve the performance of multi-GNSS PPP ambiguity resolution
The Chinese BeiDou Navigation Satellite System (BDS) contains five geostationary earth orbit (GEO) satellites, which maintain almost stationary with...
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Estimating and assessing Galileo satellite fractional cycle bias for PPP ambiguity resolution
Due to the rapid deployment of the Galileo constellation, Galileo is now able to contribute to GNSS precise point positioning (PPP) ambiguity...
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Benefits of combining GPS and GLONASS for measuring ocean tide loading displacement
GPS has been used to estimate ocean tide loading (OTL) height displacement amplitudes to accuracies of within 0.5 mm at the M2 frequency, but such...
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Computationally efficient dual-frequency uncombined precise orbit determination based on IGS clock datum
Using uncombined (UC) or undifferenced original observations has become a research topic in the global navigation satellite system (GNSS) community....
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Improving PPP-RTK-based vehicle navigation in urban environments via multilayer perceptron-based NLOS signal detection
As the latest representative of GNSS positioning technology, the PPP-RTK method, which is able to achieve centimeter-level positioning using a single...
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Inter-system PPP ambiguity resolution between GPS and BeiDou for rapid initialization
Rapid ambiguity resolution in precise point positioning (PPP-AR) has constantly been a difficulty preventing efficient initializations of user...
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Harmful Algal Blooms: An Ecological Perspective and Its Implications to Productivity Patterns in Tropical Oceans
Microalgae or phytoplanktonPhytoplankton are the primary energy harvesters in the marine ecosystems forming the base of the marine food chain as the...
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Impact of the third frequency GNSS pseudorange and carrier phase observations on rapid PPP convergences
New GNSS signals have significantly augmented positioning service and promoted algorithmic innovations such as rapid PPP convergence. With the...
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A critical review of cognitive and environmental factors of disaster preparedness: research issues and implications from the usage of “awareness (ishiki)” in Japan
The study critically reviewed the cognitive and environmental factors that influence individual disaster preparedness behavior, focusing on the...
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Undifferenced ionospheric-free ambiguity resolution using GLONASS data from inhomogeneous stations
GLONASS frequency division multiple access signals render ambiguity resolution (AR) rather difficult because: (1) Different wavelengths are used by...
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Laboratory description of shear wave velocity (Vs) in clean and hydrocarbon-polluted clayey sand (SC) samples
The shear wave velocity (Vs) of the soil which is one of the most essential factors of soil dynamics is basically used to estimate the shear modulus....
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Absolute field calibration of receiver antenna phase center models for GPS/BDS-3 signals
With the advancement of multi-GNSS systems, the field calibration of GNSS receiver antennas has been updated at Wuhan University. Benefiting from the...
