Correction to: Land surface characterization using BeiDou signal-to-noise ratio observations
In the original article publication, the affiliation of co-author Yang Hong was accidentally omitted from the manuscript. The missing affiliation is given.
Towards a zero-difference approach for homogenizing GNSS tropospheric products
A data homogenization method based on singular spectrum analysis (SSA) was developed and tested on real and simulated datasets. The method identifies abrupt changes in the atmospheric time series derived from Global Navigation Satellite System (...
Studying the ionospheric responses induced by a geomagnetic storm in September 2017 with multiple observations in America
A series of studies have suggested proven that a geomagnetic storm can accelerate the formation of plasma depletions and the generation of ionospheric irregularities. Using observation data from the Continuously Operating Reference Stations (CORS) ...
A model for assessing the impact of linear and nonlinear distortions on a GNSS receiver
The tracking performance of a global navigation satellite system (GNSS) receiver is altered by signal distortions of different kinds, ranging from transmitter and receiver imperfections to various forms of channel impairments. Accurate modeling of ...
Assessing the quality of ionospheric models through GNSS positioning error: methodology and results
- Adrià Rovira-Garcia,
- Deimos Ibáñez-Segura,
- Raul Orús-Perez,
- José Miguel Juan,
- Jaume Sanz,
- Guillermo González-Casado
Single-frequency users of the global navigation satellite system (GNSS) must correct for the ionospheric delay. These corrections are available from global ionospheric models (GIMs). Therefore, the accuracy of the GIM is important because the ...
A coarse-time positioning method for improved availability
Coarse-time positioning (CTP) is a rough positioning method using digitized samples from Global Navigation Satellite System (GNSS) receiver correlators. Since it does not require signal tracking, it can reduce power consumption dramatically. To ...
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 electron content (STEC) ionospheric ...
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 devices are still dominant in the low-...
Real-time single-frequency pseudorange positioning in China based on regional satellite clock and ionospheric models
Improving performance of single-point positioning (SPP) with single-frequency pseudorange measurement is important for users equipped with mass-market or low-cost receivers. Considering a regional single-frequency SPP service is available, it is ...
Better thresholds and weights to improve GNSS PPP under ionospheric scintillation activity at low latitudes
Ionospheric scintillation can degrade the global navigation satellite system (GNSS) measurement quality and even result in loss of signal lock, thus degrading the accuracy and reliability of GNSS precise point positioning (PPP). To reduce the ...
Assessment of the positioning performance and tropospheric delay retrieval with precise point positioning using products from different analysis centers
The performance of precise point positioning (PPP) strongly depends on the quality of satellite orbit and clock products. To give a full evaluation of PPP performance with the various publicly available precise satellite orbit and clock products, ...
Inter-system and inter-frequency code biases: simultaneous estimation, daily stability and applications in multi-GNSS single-frequency precise point positioning
Both inter-system and inter-frequency code biases (ISCB and IFCB) embodied in the multi-GNSS single-frequency precise point positioning (MSFPPP) exhibit mainly as systematic errors. Comprehensive analysis of the ISCB and IFCB characteristics and ...
Analysis of Tiangong-2 orbit determination and prediction using onboard dual-frequency GNSS data
Tiangong-2 is the first Chinese real space laboratory, launched into earth orbit with an altitude of approximately 393 km on September 15, 2016. Precise orbit determination (POD) is one of the essential conditions for conducting onboard scientific ...
Initial assessment of BDS-3 preliminary system signal-in-space range error
The basic constellation of the BeiDou global satellite navigation system (BDS-3) had been successfully completed by the end of 2018. It included 18 medium earth orbit satellites and 1 geostationary orbit satellite. An initial assessment of BDS-3 ...
Multi-GNSS fractional cycle bias products generation for GNSS ambiguity-fixed PPP at Wuhan University
The School of Geodesy and Geomatics (SGG) at Wuhan University has been generating GPS fractional cycle bias (FCB) products for users to realize ambiguity-fixed precise point positioning (PPP) since 2015. Along with the development of multiple ...
Galileo PPP rapid ambiguity resolution with five-frequency observations
Galileo, transmitting signals on the five frequencies E1, E5a, E5b, E5 and E6, has completed the fundamental constellation with 26 satellites and now can provide the global positioning service independently. Multi-frequency (triple-frequency or ...
NeQuick-G performance assessment for space applications
Other than traditional single-layer ionosphere models for global navigation satellite system (GNSS) receivers, the NeQuick-G model of Galileo provides a fully three-dimensional description of the electron density and obtains the ionospheric path ...
Enhanced orbit determination for formation-flying satellites through integrated single- and double-difference GPS ambiguity resolution
The formation-flying technique is a fundamental concept for earth observing satellite missions, which usually require both absolute and relative orbit accuracies. Their precise orbit determinations are usually exclusively performed based on ...
Apparent clock and TGD biases between BDS-2 and BDS-3
With the official commencement of the BDS-3 service, the BeiDou navigation satellite system (BDS) has become a global navigation satellite system. The characteristics of the new BDS-3 satellites, including code bias, are worth investigating. An ...
Generation of Assimilated Indian Regional Vertical TEC Maps
Regional ionospheric total electron content maps have become a prominent tool for understanding the dynamic behavior of the ionosphere. In recent times, ionospheric data assimilation methods have enhanced the prediction capabilities of global ...
PANG-NAV: a tool for processing GNSS measurements in SPP, including RAIM functionality
Global Navigation Satellite Systems (GNSSs) are theoretically able to provide accurate, three-dimensional, and continuous positioning to an unlimited number of users. An important shortcoming of GNSS is the lack of integrity, defined as the ...
Efficiency of updating the ionospheric models using total electron content at mid- and sub-auroral latitudes
- Daria S. Kotova,
- Vladimir B. Ovodenko,
- Yury V. Yasyukevich,
- Maxim V. Klimenko,
- Konstantin G. Ratovsky,
- Anna A. Mylnikova,
- Elena S. Andreeva,
- Alexander E. Kozlovsky,
- Nina A. Korenkova,
- Ivan A. Nesterov,
- Yulia S. Tumanova
Describing the current ionospheric conditions is crucial to solving problems of radio communication, radar, and navigation. Techniques to update ionospheric models using current measurements found a wide application to improve the ionosphere ...
Reconstructing antenna gain patterns of Galileo satellites for signal power monitoring
Monitoring the quality of global navigation satellite system (GNSS) signals is of primary importance for a variety of applications requiring high levels of robustness, reliability and integrity. A key element in the signal quality verification is ...
Improved IRI-2016 model based on BeiDou GEO TEC ingestion across China
Due to the quasi-invariant orbital locations of the BeiDou geostationary earth orbit (GEO) satellites, the BeiDou GEO total electron content (TEC) is not influenced by the contamination of ionospheric spatial and temporal gradient variations. We ...
Galileo and GLONASS group delay variations
Similar to the antenna phase center corrections for phase measurements, group delay variations (GDV) of satellite and receiving GNSS antennas affect code pseudorange measurements. They are frequency-dependent and vary with the direction of signal ...
Multi-scale ionosphere responses to the May 2017 magnetic storm over the Asian sector
We investigate multi-scale ionospheric responses to the May 27, 2017, geomagnetic storm over the Asian sector by using multi-instrumental observations, including ground-based global navigation satellite systems (GNSS) network, constellation ...
Absolute field calibration for multi-GNSS receiver antennas at ETH Zurich
ETH Zurich developed an absolute GNSS antenna calibration system based on measurements taken in the field. An industrial robot is used to rotate and tilt the antenna to be calibrated. This procedure ensures good coverage of the antenna hemisphere ...
INS/GNSS integration using recurrent fuzzy wavelet neural networks
In recent years, aided navigation systems through combining inertial navigation system (INS) with global navigation satellite system (GNSS) have been widely applied to enhance the position, velocity, and attitude information of autonomous ...
Improving ambiguity resolution success rate in the joint solution of GNSS-based attitude determination and relative positioning with multivariate constraints
Usually, the global navigation satellite system (GNSS)-based attitude determination and the GNSS-based relative positioning are treated as separate problems. In this contribution, the two problems are resolved as a combined solution of a joint ...