Non-negative least squares variance component estimation of mixed additive and multiplicative random error model
September 2025
In the variance component estimation (VCE) of geodetic data, the problem of negative VCE is likely to occur. In the ordinary additive error model, there have been related studies to solve the problem...
A novel GNSS imaging method through velocity uncertainty based on Gaussian process regression and its evaluation
September 2025
Global Navigation Satellite System (GNSS) imaging method (GIM) has been successfully applied to global regions to investigate vertical land motion (VLM) of the Earth's surface. GNSS images derived from...
Refining GNSS-based water storage estimation: Improved hydrological signal extraction using principal component analysis
September 2025
The Global Navigation Satellite System (GNSS) is vital for monitoring terrestrial water storage (TWS). However, effectively extracting hydrological load deformation from GNSS observations poses a significant...
Slip rate and locking degree of Haiyuan fault zone, northeastern Qinghai-Xizang plateau, based on refined block model and GPS data
September 2025
As a major fault in the northeastern Qinghai-Xizang Plateau, the Haiyuan fault zone is important for understanding the regional deformation. Aiming at the differences in the slip rate and locking degree...
Excitation of long-period free oscillations by the 2011 Tohoku earthquake: Numerical experiments and influence of source parameters
September 2025
Long-period free oscillations provide robust information for the spatio-temporal characteristics of large earthquakes. In this study, we employ a normal-mode summation algorithm to generate three-component...
Seismotectonic analysis of the December 2023 MS6.2 Jishishan earthquake: Insights from high-resolution DEM, aftershock relocation, and fault modeling
September 2025
The December 18, 2023, MS6.2 Jishishan earthquake occurred along the northeastern margin of the Qinghai-Xizang Plateau within the Laji–Jishi Shan Fault Zone (LJSFZ), a complex thrust-dominated tectonic...
Source modeling of the 2023 Herat earthquake sequence determined from InSAR observations
September 2025
During 7th-15th October 2023, an earthquake sequence with four MW6.2–6.3 occurred in the Herat region, Afghanistan, causing damage to buildings, fire, and loss of life. The co-seismic deformation induced...
Low orbit regional enhanced navigation constellation for BDS3 design based on Bayesian optimization algorithm
September 2025
The application of Low Earth Orbit (LEO) satellite navigation can enhance geometric structure, increase observations and contribute to navigation and positioning. To improve the performance of the navigation...
InSAR time series analysis of natural and anthropogenic coastal plain subsidence: A case of Hangjiahu plain
September 2025
The early excessive groundwater exploitation caused extensive land subsidence in the Hangjiahu Plain (HJHP), threatening geological stability and infrastructure. Government restrictions on groundwater...
InSAR coseismic deformation and seismogenic structure of the 2023 MW6.9 Tajikistan earthquake
September 2025
An earthquake of magnitude 6.9 occurred in Tajikistan on February 23, 2023. Studying this earthquake is the key to understanding the seismogenic structure of this area. The slip distribution of the...
Real-time retrieval of high-precision ZTD maps using GNSS observation
September 2025
Zenith Tropospheric Delay (ZTD) is an important factor that restricts the high-precision positioning of global navigation satellite system (GNSS), and it is of great significance in establishing a real-time...
Residual-based neural network for unmodeled distortions in 2D coordinate transformation
Available online 11 September 2025
Coordinate transformation models often fail to account for nonlinear and spatially dependent distortions, leading to significant residual errors in geospatial applications. Here, we propose a residual-based...
InSAR monitoring of large gradient deformation in coalfield and phase unwrapping research
Available online 20 August 2025
Small Baseline Subset Interferometric Synthetic Aperture Radar (SBAS-InSAR) is widely used for deformation monitoring in mining regions. However, phase unwrapping errors often limit its effectiveness...
A navigation method for IMU/odometer fusion based on horizontal attitude constraints
Available online 9 August 2025
The current inertial measurement unit (IMU) and odometry fusion navigation algorithms often incorporate non-holonomic constraints (NHC) to obtain three-dimensional velocity in the navigation frame....
A review of altimetry waveform retracking for inland water levels
July 2025
Reliable surface height observations over inland water bodies are useful for understanding the hydrological cycle. Satellite radar altimetry particularly contributed with its long-term archive and minimal...
Kinematics of the Kashmir Himalaya: Inferences from geological and geodetic data
July 2025
The GPS data sourced from the permanent GPS network in the Kashmir Himalaya were utilized to quantify both vertical and horizontal deformation rates in the Kashmir Valley of the northwestern Himalaya....
A zenith wet delay improved model in China based on GPT3 and random forest
July 2025
Zenith wet delay (ZWD) is a key parameter for the precise positioning of global navigation satellite systems (GNSS) and occupies a central role in meteorological research. Currently, most models only...
Enhanced BDS four-frequency cycle slip detection and repair using fuzzy clustering analysis
July 2025
Cycle slip detection and repair is one of the key technologies for GNSS high-precision positioning. We introduce an enhanced methodology for detecting and repairing BDS four-frequency cycle slips, utilizing...
Magnitude and seismogenic fault determination of ground effects paleosismic-induced at Huoshan and Guzhen in Anhui province, China
July 2025
In paleoseismic research, defining the age of an event is relatively straightforward, but pinpointing its magnitude with precision is challenging. This difficulty primarily arises because physical parameters,...
GNSS time series analysis of the crustal movement network of China: Detecting the optimal order of the polynomial term and its effect on the deterministic model
July 2025
GNSS time series analysis provides an effective method for research on the earth's surface deformation, and it can be divided into two parts, deterministic models and stochastic models. The former part...
Spatiotemporal distribution of GNSS-derived PWV in Australia from 2010 to 2019
July 2025
The weather in Australia is significantly influenced by water vapor evaporated from warm ocean surfaces, which is closely associated with various extreme weather events in the region, such as floods,...
Analysis of ionospheric disturbances due to earthquakes using 3D tomography models to test the height maximum of CID correlation in various regions
July 2025
Ionospheric disturbances caused by acoustic waves emitted during earthquakes were studied using the Global Navigation Satellite System (GNSS) to analyze the changes in total electron content (TEC) values....
Three-dimensional density structure of Xu-Su arc-shaped nappe structure and its relationship with seismic activity
July 2025
Controlled by the squeezing collision between the Yangtze block and the North China block and the left movement of the Tanlu fault, the Xu-Su region developed into an arc-shaped nappe structure, and...
Spatiotemporal evolution of long-term slow slip events at the Hikurangi subduction zone, New Zealand (2021–2023): Implications for seismic activity
July 2025
Various slow slip events (SSEs) with distinct characteristics have been detected globally, particularly in regions with dense Global Navigation Satellite Systems (GNSS) networks. In the Hikurangi subduction...
Modeling and forecasting of TEC using subspace-based SSA-LRF-ANN model
July 2025
Subspace-based signal processing methods are fundamentally pre-trained Artificial Neural Networks (ANN) that provide the basic structure for numerous computer vision applications and explore the most...