Forest mapping, one of the main components performing a forest inventory, is an important driving force in development laser scanning. Mobile scanning (MLS), which scanners are installed on moving platforms, has been studied as convenient measurement method for mapping past several years. Positioning and attitude accuracies using MLS systems. Inertial Navigation Systems (INSs) Global Satellite (GNSSs) typical popular positioning sensors used In environments, because loss signal due to...

A Global Navigation Satellite System (GNSS)/Inertial (INS)/Light Detection and Ranging (LiDAR)-Simultaneous Localization Mapping (SLAM) integrated navigation system based on graph optimization is proposed implemented in this paper. The results are obtained by the information fusion of GNSS position, Inertial Measurement Unit (IMU) preintegration result relative pose from 3D probability map matching with optimizing. sliding window method was adopted to ensure that computational load does not...

The ionosphere is characterized by a high concentration of ionized particles, plays critical role in the propagation characteristics radio signals upper atmosphere. During major geological events, such as earthquakes and volcanic eruptions, often exhibits anomalous disturbances. In event an earthquake, energy accumulated within Earth's crust released propagates along fault lines, generating waves—including Rayleigh waves, acoustic gravity waves—that ascend into induce fluctuations Total...

Typhoons, originating from tropical ocean surfaces, are among the most severe natural disasters worldwide, often leading to significant loss of life and property. Research indicates that Total Electron Content (TEC) ionosphere experiences various disturbances before after a typhoon event. This study utilizes global ionospheric data provided by Chinese Academy Sciences (CAS) analyze anomalies in TEC during 15-day period surrounding Super Typhoon "Meranti" (No. 14) 2016, employing Singular...

During magnetic storms, scintillation is instigated by significant disturbances in the ionosphere that deviate from mean level. Utilizing global ionospheric TEC and ROTI data, this study analyzes impact during substantial storm of December 2015. The analysis reveals storm, southern hemisphere was primarily characterized positive-phase whereas northern exhibited brief storms succeeded prolonged intense negative-phase storms. response to more pronounced at low mid-latitudes compared high...

LiDAR Simultaneous Localization and Mapping (SLAM) is able to map unknown scene while online estimating the LiDAR's pose. Traditional SLAM frameworks mainly rely on geometric features in environments, but ignore intensity information, leading low accuracy scenes with sparse environmental features. This paper proposes a novel intensity-based LiDAR-SLAM framework. In front-end, are extracted match two consecutive scans. To keep time efficiency, self-adaptive feature selection strategy proposed...

Vehicle trajectory prediction is essential for intelligent transportation systems and smart cities, but the of long-range trajectories still challenging. Since speed a moving vehicle relatively high, coordinates discrete points may vary from 0 to 10 km in prediction. Moreover, contains random noises due instability GPS signals urban areas error accumulation effect other sensors positioning. To address this issue, data treated as signal, multiple signal components are extracted original...

High-precision positioning and navigation are necessary for autonomous driving. GNSS RTK INS integrated system is commonly used in vehicular navigation. But it suffers from severe signal reflections blockages of signals error accumulation with MEMS-IMU GNSS-challenging environment. In addition, high-definition (HD) maps vector format light detection ranging (LiDAR) two common options intelligent vehicles. A tightly coupled localization method HD map, LiDAR, RTK, proposed to take advantage...

Global navigation satellite system (GNSS) is one of the most effective means for landslide monitoring. At present, studies on GNSS-based monitoring focus long-term analysis, while short-term displacement not clear. The purpose this article to explore a detection method based GNSS kinematic positioning significance and feasibility are presented, time series segmentation proposed. coordinate reconstructed by Daubechies wavelet extract abrupt components. window formed current epoch coordinates...

Code Differential Global Positioning System (DGPS) is widely used in satellite navigation and positioning because of its simple algorithm preferable precision. Multi-Global Navigation Satellite (GNSS) expected to enhance the accuracy, reliability availability GNSS (DGNSS) positioning. Traditional DGNSS models should set separate clock parameters due differences between different systems. Awareness Inter-System Bias (ISB) could help maximise redundancy model, thus improving performance...

The detailed structure information under the forest canopy is important for forestry surveying. As a high-precision environmental sensing and measurement method, terrestrial laser scanning (TLS) widely used in In TLS-based surveys, stem-mapping, which focused on detecting extracting trunks, one of core data processing tasks basis subsequent calculation tree attributes; most basic attributes diameter at breast height (DBH). This article explores improves methods stem mapping DBH estimation...

Simultaneous localization and mapping (SLAM) has been investigated in the field of robotics for two decades, as it is considered to be an effective method solving positioning problem a single framework. In SLAM community, Extended Kalman Filter (EKF) based particle filter are most mature technologies. After years development, graph-based becoming promising technology lot progress made recently with respect accuracy efficiency. No matter which used, loop closure vital part overcoming...

The rapid movement of low Earth orbit (LEO) satellite can improve geometric diversity, which contributes to the convergence Global Navigation Satellite System (GNSS) precise point positioning (PPP). However, LEO onboard receiver clock cannot be used directly by PPP users as because and absorb different code delays when receiving transmitting signals. In this study, a real-time estimation approach for based on ground tracking stations was proposed first time. feasibility analyzed using time...

As the field of high-precision applications based on carriers continues to expand, development low-cost, small, modular receivers and their application in diverse scenarios situations with complex data quality has increased requirements carrier-phase preprocessing. A new geometry-based cycle slip detection repair method Global Position System (GPS) + BeiDou Navigation Satellite (BDS) is proposed. The uses a Time-differenced Carrier Phase (TDCP) model, which eliminates Inner-System Bias (ISB)...

For GPS medium-long baseline real-time kinematic (RTK) positioning, the troposphere parameter is introduced along with coordinates, and model ill-conditioned due to its strong correlation height parameter. BeiDou Navigation Satellite System (BDS), additional difficulties occur special satellite constellation. In fact, relative zenith delay (RZTD) derived from high-precision empirical models can be introduced. Thus, strength improved, which also called RZTD-constrained RTK model. this...

The precision of railway map is becoming a significant issue for autonomous train scheduling, monitoring and maintenance, related location-based service (LBS), further ensuring travel safety. Mobile 3D laser scanning an efficient method making relative high-precision track maps, particularly during the night period light detection ranging (LiDAR) can work without ambient light. In this paper, we propose accurate vectorization based on LiDAR point clouds from self-built Laser Scanning (MLS)...

High-precision and robust localization in GNSS-denied areas is crucial for autonomous vehicles robots. Most state-of-the-art methods are based on simultaneous mapping (SLAM) with a camera or light detection ranging (LiDAR). However, SLAM will suffer from drift during long-term running without loop closure prior constraints. Lightweight, high-precision environmental maps have gradually become an indispensable part of future driving. In order to solve the problem real-time global robots, we...

Indoor positioning technology based on Received Signal Strength Indicator (RSSI) fingerprints is a potential navigation solution, which has the advantages of simple implementation, low cost and high precision. However, as radio frequency signals can be easily affected by environmental change during its transmission, it quite necessary to build location fingerprint database in advance update frequently, thereby guaranteeing accuracy. At present, building methods mainly include point...