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Article
An efficient pixel shader-based ray-tracing method for correcting GNSS non-line-of-sight error with large-scale surfaces
Ray-tracing methods have been developed to effectively correct the global navigation satellite system (GNSS) non-line-of-sight (NLOS) errors in urban environments to increase the satellite geometry and positio...
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Article
Solution separation-based integrity monitoring for RTK positioning with faulty ambiguity detection and protection level
Due to the multipath and signal shading effects, there exist biases in the carrier phase measurements, which degrades the reliability of ambiguity resolution in real-time kinematic (RTK) positioning and, subse...
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Article
Robust unambiguous ranging technique for BDS-3 B1 wideband composite signals
During the evolution of global navigation satellite systems (GNSS), many new GNSS signals have been proposed to meet the demand of various applications for high-precision positioning. The single-sideband compl...
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Article
Non-consecutive GNSS signal tracking-based ultra-tight integration system of GNSS/INS for smart devices
Consecutively tracking the global navigation satellite system (GNSS) signal can cause power and computation difficulties to a smart GNSS device with small battery capacity and weak computation capability. We p...
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Article
HPL calculation improvement for Chi-squared residual-based ARAIM
To obtain the tightest possible horizontal protection level (HPL) for the Chi-squared residual-based advanced receiver autonomous integrity monitoring (ARAIM), it is prerequisite to determine the worst horizon...
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Article
Enhanced fault detection and exclusion based on Kalman filter with colored measurement noise and application to RTK
With the development of high-precision safety–critical applications using global navigation satellite systems (GNSS), fault detection and exclusion (FDE) is indispensable to guaranteeing the integrity of a GNS...
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Article
A linear Kalman filter-based integrity monitoring considering colored measurement noise
Apart from positioning accuracy, the reliability of a navigation system is also significant, especially for safety–critical applications, such as intelligent vehicle navigation. Generally, the Global Navigatio...
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Article
Understanding long-term variations in GPS differential code biases
Precise estimation of satellite differential code biases (DCBs) plays a crucial role in precise ionospheric modeling, positioning, and timing. Due to the rank deficiency, a constraint or a datum is required in...
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Article
A BDS-3 B1C/B2a dual-frequency joint tracking architecture based on adaptive Kalman filter and extended integration time
With the development of the third-generation BeiDou navigation satellite system (BDS-3), the availability of new civil B1C and B2a signals along with existing B1I and B3I signals will greatly benefit the desig...
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Article
Real-time precise point positioning with a low-cost dual-frequency GNSS device
In recent years, there is an increasing demand for precise positioning with low-cost GNSS devices in support of applications from self-driving cars to unmanned aerial vehicles. Although single-frequency GNSS d...
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Article
Estimation and representation of regional atmospheric corrections for augmenting real-time single-frequency PPP
Real-time single-frequency precise point positioning (PPP) can be significantly augmented by applying high-quality atmospheric corrections. In previous work, the satellite-and-station-specific slant total elec...
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Article
Pivot single-difference ambiguity resolution for multi-GNSS positioning with non-overlap** frequencies
Ambiguity resolution in real-time kinematic (RTK) positioning is increasingly dependent on the combination of multi-GNSS observations, especially in challenging signal environments such as urban canyon areas. ...
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Article
FCB estimation with three different PPP models: equivalence analysis and experiment tests
Precise and reliable fractional cycle bias (FCB) products are critical for ambiguity resolution of precise point positioning (PPP). Three PPP models are usually adopted to generate the FCB products, i.e., the ...
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Article
A new datum jump detection and mitigation method of Real-Time Service (RTS) clock products
Real-time orbit and clock products are crucial for real-time precise point positioning (PPP) applications. The International Global Navigation Satellite System (GNSS) Service (IGS) launched the Real-Time Servi...
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Article
Precise point positioning ambiguity resolution by integrating BDS-3e into BDS-2 and GPS
With the development of BDS-3, more BDS satellites are in orbits which can contribute to the reduction in the initial time of ambiguity fixing as well as the increase in the ambiguity fixing rate. We focus on ...
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Article
Estimation of GPS LNAV based on IGS products for real-time PPP
Precise satellite orbit and clock corrections are essential to precise point positioning (PPP). The standard GPS legacy navigation (LNAV) message disseminated by the satellite is one of the most widely used so...
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Article
Improvement of carrier phase tracking in high dynamics conditions using an adaptive joint vector tracking architecture
The standard vector phase-locked loop (VPLL) with fixed pre-defined process noise covariance matrix usually loses lock when the receiver experiences high dynamic conditions. Two adaptive Kalman filters (KF), w...
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Article
Quality assessment of CNES real-time ionospheric products
Real-time single-frequency precise point positioning (RT-SF-PPP) has become a desired positioning approach because it can achieve high positioning accuracy with a low-cost global navigation satellite system (G...
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Article
Real-time carrier phase multipath detection based on dual-frequency C/N0 data
Since carrier phase multipath cannot be easily captured or mitigated, especially in real-time and kinematic applications, it is necessary to assess the multipath significance. We propose a real-time multipath ...
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Article
Theoretical analysis of unambiguous 2-D tracking loop performance for band-limited BOC signals
Code-tracking accuracy, an important attribute of receiver performance assessment, depends both on characteristics of the ranging signal being tracked and on the structure of the tracking channel. The implemen...