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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 ...
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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...
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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...
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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 ...
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Article
Open AccessRecent Progress in Atmospheric Chemistry Research in China: Establishing a Theoretical Framework for the “Air Pollution Complex”
Atmospheric chemistry research has been growing rapidly in China in the last 25 years since the concept of the “air pollution complex” was first proposed by Professor **aoyan TANG in 1997. For papers published...
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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...
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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...
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Article
Experimental Study of Hollow-cylinder Sandstone Under Constant Mean Stress Considering the Rotation of Principal Stress Axes
A series of constant mean stress tests considering principal stress axes rotation is conducted on hollow-cylinder sandstone.
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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...
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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...
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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...
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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 ...
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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...
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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...
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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 ...
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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...
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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...
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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...
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Article
Exploring more solutions for low-energy transfers to lunar distant retrograde orbits
This study aims to explore more solutions for low-energy transfers to lunar distant retrograde orbits (DROs) from the vicinity of the Earth. Millions of transfer trajectories from a lunar free-return orbit (LF...
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Article
Investigations of mechanical and failure properties of 3D printed columnar jointed rock mass under true triaxial compression with one free face
The failure and mechanical properties of columnar jointed rock mass (CJRM) after excavation are of great significance to the stability evaluation of rock mass engineering. In this investigation, for understand...