Keywords: GNSS positioning, forest, accuracy assessmentįorestry, as a principal part of ecological civilization construction, plays important ecological, economic, social and cultural roles. This suggests that the BDS/GPS-integrated positioning algorithm can obtain more accurate positioning results for complex forest environments.Ĭonstruction and Accuracy Analysis of a BDS/GPS-Integrated Positioning Algorithm for Forests The results obtained using the BDS/GPS-integrated positioning algorithm for forests had significantly higher theoretical and actual accuracies in the X, Y and Z directions than those obtained using the GPS positioning algorithm. However, because there were more visible satellites for the BDS/GPS-integrated positioning, the signals from the BDS/GPS-integrated satellites were stronger and had a more stable SNR than those from the GPS satellites alone. The signal noise ratio (SNR) of the BDS/GPS-integrated satellite signals and GPS satellite signals were both in the range of 10–50 dB-Hz. The Position Dilution of Precision (PDOP) values for the BDS/GPS-integrated positioning ranged from 0.5 to 1.9, lower than those for GPS positioning. The experimental results indicated that, compared with GPS positioning, there were 13–27 visible satellites available for the BDS/GPS-integrated positioning algorithm for forests, far more than the satellites available for the GPS positioning algorithm alone. Finally, the results were compared with the positioning results obtained using GPS alone. Additionally, the algorithm is also written into the RTKLIB software to calculate the three-dimensional (3D) coordinates of the forest observation point in the World Geodetic System 1984 (WGS-84) coordinate system. The BDS/GPS-integrated positioning algorithm for forests was constructed by temporally and spatially unifying the satellite systems and using a reasonable observed value weighting method. Compared with T-23, the u-blox NEO-M8T is much lighter and more flexible in the forest. A Sanding T-23 multi-frequency three-constellation receiver and a u-blox NEO-M8T multi-constellation receiving module were used for continuous observation under the forest canopy. The Quercus variabilis broad-leaved forest in Jiufeng National Forest Park and the Sabina Coniferous forest in Dongsheng Bajia forest farm were selected as the study area. The objective of this study was to construct a BeiDou navigation satellite system (BDS)/global positioning system (GPS)-integrated positioning algorithm that meets the accuracy requirement of forest surveys and to analyze its accuracy to provide theoretical and technical support for accurate positioning and navigation in forests. Green Infrastructure Mapping in Urban Areas Using Sentinel-1 Imagery.Evaluating the Effectiveness of Mulching for Reducing Soil Erosion in Cut Slope and Fill Slope of Forest Roads in Hyrcanian Forests.Construction and Accuracy Analysis of a BDS/GPS-Integrated Positioning Algorithm for Forests.Impact of Rainy and Dry Seasons on Eucalypt Fuelwood Quality Logs Stored in Piles: a Case Study in Brazil.Forest Machinery Fires: Trends in New Zealand Forest Harvesting Sector.Economic Feasibility of Electrical Power Cogeneration from Forestry Biomass in an Engineered Wood Panel Industrial Facility.Efficiency of Different Anti-Dust Agents in Reducing Dust Emission from Forest Road and Deposition on Leaf Surface.Skyline Tensile Forces in Cable Logging: Field Observations vs.Influence of Saturated Organic Matter on the Accuracy of In-Situ Measurements Recorded with a Nuclear Moisture and Density Gauge.Ground Pressure Changes Caused by MHT 8002HV Crawler Harvester Chassis.Developing an Automated Monitoring System for Cable Yarding Systems.Evaluation of an HSM 208F 14tone HVT-R2 Forwarder Prototype under Conditions of Steep-Terrain Low-Access Forests.Vertical Crown Fuel Distributions in Natural Calabrian Pine (Pinus brutia Ten.) Stands.Evaluating the Effects of Improving Forest Road Standards on Economic Value of Forest Products.Current issues: Volume 42 No.2 Latest papers
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