40 Result(s)
within
Tianhe **ao
Earth Sciences
-
Article
Sea level rise along China coast from 1950 to 2020
Global mean sea level rise has been reconstructed using tide gauges. However, long-term sea level rise along the China coast is unclear. To address this issue, a data assimilation approach is developed to reco...
-
Article
An ensemble of dynamic rainfall index and machine learning method for spatiotemporal landslide susceptibility modeling
Rain-induced landslides are one of the most recurrent geohazards around the world, posing great threats to the safety and property of people living in mountainous areas. One of the most effective strategies fo...
-
Article
Design of real-time GNSS-R software-defined receiver for coastal altimetry using GPS/BDS/QZSS signals
Global navigation satellite system reflectometry (GNSS-R) has considerable potential for monitoring sea surface height with high spatiotemporal resolution at low cost. However, because of the immaturity of ref...
-
Article
A precipitation forecast model with a neural network and improved GPT3 model for Japan
Accurate monitoring of atmospheric water vapor content is essential for the early warning of extreme weather events. As known, GNSS zenith troposphere delay (GNSS_ZTD) is an indispensable data source for retri...
-
Article
Analysis of the J2 relativistic effect on the performance of on-board atomic clocks
The GNSS satellite atomic clock is subjected to appreciable relativistic effects during its in-orbit operation. These effects include drift due to the gravitational redshift and time dilation due to the relati...
-
Article
Inter-system biases solution strategies in multi-GNSS kinematic precise point positioning
Estimating inter-system biases (ISBs) is important in multi-constellation Global Navigation Satellite System (GNSS) processing. The present study aims to evaluate and screen out an optimal estimation strategy ...
-
Article
Coastal GNSS-R phase altimetry based on the combination of L1 and L5 signals under high sea states
High-precision sea surface heights retrieved from the Global Navigation Satellite System Reflectometry (GNSS-R) measurements will be valuable in the fields of geodesy and oceanography studies. Due to the short...
-
Article
Effect of the polar cap ionospheric sporadic-E layer on GNSS-based positioning: a case study at Resolute Bay, Canada, September 5, 2012
We focus on the impacts of the polar cap ionospheric sporadic-E (Es) layer that occurred at Resolute Bay, Canada, on September 5, 2012, on the quality of the Global Positioning System (GPS) observable and the ...
-
Chapter and Conference Paper
A Method to Correct the Raw Doppler Observations for GNSS Velocity Determination
In the application of GNSS in the velocity determination, it is often the case that some GNSS receivers give an opposite sign for the raw Doppler observations which do not correspond to the real Doppler shift....
-
Article
LEO-constellation-augmented multi-GNSS real-time PPP for rapid re-convergence in harsh environments
GNSS signals are blocked in forests, urban canyons, and indoors. Precise positioning can hardly be guaranteed in these challenging environments. A low earth orbit (LEO) constellation serving as a navigation sy...
-
Article
Surface radiation characteristics and downward cloud radiative forcing in southern **njiang during summer 2019
This study analyzed the surface radiation characteristics and evaluated downward cloud radiative forcing (CRF) in southern **njiang during summer 2019. Surface radiation fluxes show prominent day-to-day and di...
-
Article
Integrated GNSS Doppler velocity determination for GEOHALO airborne gravimetry
A gravity sensor onboard an aircraft always measures the sum of all accelerations acting on the sensor. To separate the accelerations caused by the movement of the aircraft from the gravitational accelerations...
-
Article
A shipborne experiment using a dual-antenna reflectometry system for GPS/BDS code delay measurements
Global navigation satellite system-reflectometry (GNSS-R) has great potential to be a novel technique for altimetry, which can be used to derive sea surface heights (SSH). Shipborne altimetry is an important m...
-
Article
Open AccessAn investigation of mass changes in the Bohai Sea observed by GRACE
The Gravity Recovery and Climate Experiment (GRACE) satellite mission has profoundly advanced our knowledge of contemporary sea level change. Owing to the coarse spatial resolution and leakage issue across the...
-
Article
Seafloor geodetic network establishment and key technologies
Seafloor geodetic network construction involves the development of geodetic station shelter, network configuration design, location selection and layout, surveying strategy, observation model establishment and...
-
Article
An improved prediction algorithm for Earth’s polar motion with considering the retrograde annual and semi-annual wobbles based on least squares and autoregressive model
Earth Rotation Parameters (ERP) are indispensable in the transformation between the Celestial Reference Frame and the Terrestrial Reference Frame, and significant for high-precision space navigation and positi...
-
Article
Analytical optimization on GNSS buoy array for underwater positioning
Global navigation satellite system (GNSS)/acoustic positioning precision is determined by the positioning geometry and the ranging precision; thus optimizing GNSS buoys array is meaningful to improve the posit...
-
Article
Multi-GNSS precise orbit positioning for airborne gravimetry over Antarctica
Accurate position, velocity, and acceleration information are critical for airborne gravimetry. In Antarctica, there is a sparse distribution of IGS stations, and the rough terrain makes it impractical to set ...
-
Article
Comparing satellite orbit determination by batch processing and extended Kalman filtering using inter-satellite link measurements of the next-generation BeiDou satellites
The next-generation BeiDou satellites are equipped with inter-satellite link (ISL) payloads to realize the ability of autonomous navigation (Auto-Nav). We focus on the application of batch processing and exten...
-
Article
Adaptive Kalman filter based on variance component estimation for the prediction of ionospheric delay in aiding the cycle slip repair of GNSS triple-frequency signals
In order to incorporate the time smoothness of ionospheric delay to aid the cycle slip detection, an adaptive Kalman filter is developed based on variance component estimation. The correlations between measure...
