53 Result(s)

Article

A novel de-noising method for NMR echo data obtained from tight sandstone reservoirs

To improve the signal-to-noise ratio (SNR) of nuclear magnetic resonance (NMR) echo data with SNR below 8 obtained from tight sandstone reservoirs and improve the accuracy of the porosity obtained from ...

**angning Meng, Hui Jia, Tianze Zhu, Youbin Wu, Yang Gao, Shusheng Wang… in Acta Geophysica (2024)

Article

Vectorial integer bootstrap** of best integer equivariant estimation (VIB-BIE) for efficient and reliable GNSS ambiguity resolution

Reliable integer ambiguity resolution (IAR) is essential for carrier phase-based centimeter-level accurate positioning using global navigation satellite systems (GNSSs). In all IAR methods, the best integer eq...

Weikai Miao, Bofeng Li, Yang Gao, Guang’e Chen in Journal of Geodesy (2024)

Article

Accuracy enhancement of IMERG precipitation estimates using 20-year climatological adjustment: designing three rounds of modeling with two calibration schemes to drive multi-type regression models

The actual application of Integrated Multi-Satellite Retrievals for Global Precipitation Measurement (IMERG) is restricted by the bias revealed by ground data. This study established seven regression models (R...

Fuwan Gan, Zheng Wei, **ang Diao, **anci Zhong, Yang Gao in Climate Dynamics (2024)

Article

Dynamic Cutting Force Model and Vibration Analysis of the Cutterhead in TBM

Dynamic information about the cutting force of each cutter, such as peak and frequency of normal force, is essential to address the deformation and vibration of the cutterhead during tunnel construction using ...

Hao-kai Sun, Yang Gao in Rock Mechanics and Rock Engineering (2023)

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...

Zhitao Lyu, Yang Gao in GPS Solutions (2023)

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...

Yuting Gao, Yang Jiang, Yang Gao, Guanwen Huang, Zhe Yue in GPS Solutions (2023)

Article

Experimental Study of Hollow-cylinder Sandstone Under Constant Mean Stress Considering the Rotation of Principal Stress Axes

Article

The linear behavior of the joint initial-boundary-value predictability of the climate system

The primary sources of predictability of the Earth climate system come from initial conditions and external radiative forcings, which is a joint initial-boundary-value problem. It is crucial to clearly underst...

Jianlin Yong, Shaoqing Zhang, Zhengyu Liu, Yang Gao, Lixin Wu… in Climate Dynamics (2023)

Article

Asynchronous and time-differenced RTK for ocean applications using the BeiDou short message service

The ocean real-time kinematic (ORTK) technique was proposed to realize high-precision GNSS positioning for long baselines with differential corrections transmitted through the BeiDou short message service, whe...

Zhiteng Zhang, Bofeng Li, Yang Gao, Zhetao Zhang, Siyao Wang in Journal of Geodesy (2023)

Article

Intelligent velocity picking and uncertainty analysis based on the Gaussian mixture model

The stacking velocity is often obtained manually. However, manually picking is inefficient and is easily affected by subjective factors such as the priori information and the experience of different processors...

**aowei Wang, Yang Gao, Chang Chen, Huan Yuan, Sanyi Yuan in Acta Geophysica (2022)

Article

A new partial ambiguity resolution method based on modified solution separation and GNSS epoch-differencing

Partial ambiguity resolution has been widely used in real-time kinematic (RTK) positioning to provide accurate and continuous centimeter-level positioning solutions. Current PAR methods are concerned with the ...

Yang Jiang, Wei Ding, Yuting Gao, Yang Gao in Journal of Geodesy (2022)

Article

Characteristics and dynamic analysis of the October 2018 long-runout disaster chains in the Yarlung Zangbo River downstream, Tibet, China

On October 17 and 29, 2018, two rock and ice avalanches occurred on the western slope of the Sedongpu Basin upstream of the Yarlung Zangbo River in the Tibetan Plateau. Both avalanches formed the disaster chai...

Tiantian Zhang, Yue** Yin, Bin Li, Yang Gao, Meng Wang in Natural Hazards (2022)

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...

Yunhan Qi, Zheng Yao, Yang Gao, Mingquan Lu in GPS Solutions (2022)

Article

A new ambiguity resolution method for LEO precise orbit determination

Ambiguity resolution (AR) is an effective approach to improve the orbit accuracy of the low Earth orbit satellites using the Global Navigation Satellite System (GNSS). The most commonly used single-difference ...

**ngyu Zhou, Hua Chen, Wei** Jiang, Yan Chen, Taoyong **… in Journal of Geodesy (2022)

Article

PPP-RTK with augmentation from a single reference station

Precise point positioning (PPP) with augmentation by a network of continuously operating reference stations (CORS), known as PPP-RTK, enables fast ambiguity resolution with PPP. However, it suffers from the de...

Zhitao Lyu, Yang Gao in Journal of Geodesy (2022)

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...

Baoyu Liu, Yang Gao, Yuting Gao, Kaixiang Tong, Mouyan Wu in GPS Solutions (2022)

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...

Baoyu Liu, Yang Gao, Yuting Gao, Shizhuang Wang in GPS Solutions (2022)

Article

Real-time cascading PPP-WAR based on Kalman filter considering time-correlation

Precise point positioning (PPP) with wide-lane ambiguity resolution (PPP-WAR) can quickly achieve decimeter-level positioning accuracy, which is an essential improvement for real-time PPP in terms of reliabili...

Yang Jiang, Yuting Gao, Peiyuan Zhou, Yang Gao, Guanwen Huang in Journal of Geodesy (2021)

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...

Yuting Gao, Yang Gao, Baoyu Liu, Yang Jiang in GPS Solutions (2021)