GPS Solutions
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Fast estimation and analysis of the inter-frequency clock bias for Block IIF satellites
GPS Solutions - Tập 17 - Trang 347-355 - 2012
The inter-frequency bias of PRN25 was noticed by the scientific community and considered to be caused by thermal variations. The inter-frequency bias leads to an apparent inter-frequency clock bias (IFCB), which could be obtained using the difference of two ionosphere-free phase combinations (L1/L2 and L1/L5). We present an efficient approach derived from the epoch-differenced strategy for fast es...... hiện toàn bộ
Real-time carrier phase multipath detection based on dual-frequency C/N0 data
GPS Solutions - Tập 23 - Trang 1-13 - 2018
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 detection method using dual-frequency carrier-to-noise-power-density ratio (C/N0). The proposed method takes full account of the relationship between the multipath and C/N0. Specifically, whe...... hiện toàn bộ
Suppression of multipath and jamming signals by digital beamforming for GPS/Galileo applications
GPS Solutions - Tập 6 - Trang 257-264 - 2003
Digital beamforming (DBF) has been studied to obtain automatic beam steering towards desired signals and simultaneous elimination of multipath and jamming signals at GNSS receivers, which is made possible by spatial and temporal digital signal processing. In this paper, the limitations of conventional multipath and jamming suppression techniques, which have been proven and widely used in GPS, are ...... hiện toàn bộ
Vulnerability of the GPS Signal to Jamming
GPS Solutions - Tập 3 - Trang 19-27 - 1999
The Global Positioning System (GPS) and Wide Area Augmentation System (WAAS) provide lower power signals that are susceptible to interference. The potential exists for a person or organization to jam GPS or WAAS signals, causing a loss of service over a large area. Accidental interence by extraneous radio transmissions on the GPS frequency also can cause loss of service. Jamming has become a serio...... hiện toàn bộ
Analysis and on-line compensation of gravity disturbance in a high-precision inertial navigation system
GPS Solutions - Tập 24 - Trang 1-8 - 2020
Zero velocity update technology (ZUPT) has frequently been used as a tool to reduce divergence when the inertial navigation system (INS) is working in pure inertial mode. In general, the normal gravity model is adopted to calculate the gravity vector, and the effect of gravity disturbance is neglected. We present a new point of view to explain the influence of gravity disturbance on INS and point ...... hiện toàn bộ
Analysis of sub-daily polar motion derived from GPS with different temporal resolutions
GPS Solutions - Tập 28 - Trang 1-13 - 2023
This study investigates the sub-daily polar motion (PM) derived from different estimation interval solutions ranging from 5 min/2 h. By analyzing a 3-year continuous time series of the PM estimates using Global Positioning System (GPS) observations, we conclude that PM should be parameterized as piecewise constant for intervals no longer than 30 min, while piecewise linear parameterization is more...... hiện toàn bộ
A new three-dimensional computerized ionospheric tomography model based on a neural network
GPS Solutions - Tập 25 Số 1 - Trang 1-17 - 2021
Computerized ionospheric tomography (CIT) is an ill-posed inverse problem owing to insufficient data acquisition. Therefore, the ionospheric electron density (IED) distributions cannot be reconstructed accurately. Although many attempts have been made to deal with this issue, there is still a long way to go before it can be completely overcome. Specifically, the inverted IEDs of voxels without obs...... hiện toàn bộ
Ionospheric corrections tailored to Galileo HAS: validation with single-epoch navigationAbstract The Galileo high accuracy service (HAS) is a new capability of the European global navigation satellite system, currently providing satellite orbit and clock corrections and dispersive effects such as satellite instrumental biases for code and phase. In its full capability, Galileo HAS will also correct the ionospheric delay on a continental scale (initiall... ... hiện toàn bộ
GPS Solutions - - 2024
Real-time capturing of seismic waveforms using high-rate BDS, GPS and GLONASS observations: the 2017 Mw 6.5 Jiuzhaigou earthquake in China
GPS Solutions - Tập 23 - Trang 1-12 - 2018
The rapid development of the BeiDou Satellite Navigation System (BDS) and other Global Navigation Satellite System (multi-GNSS) constellations provides a great opportunity to contribute to earthquake early warning systems in terms of capturing displacement and velocity waveforms for the estimation of magnitude and fault slip inversion. In this study, we demonstrate the capability of BDS and the be...... hiện toàn bộ
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