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Errors in Global Positioning System01:26

Errors in Global Positioning System

32
Global Positioning System (GPS) technology has revolutionized navigation and positioning, but its accuracy is often compromised by various errors. These errors, stemming from environmental, satellite, and receiver-related factors, require careful mitigation to ensure reliable performance across applications.Atmospheric ErrorsGPS signals travel through the Earth’s ionosphere and troposphere, introducing delays which affect accuracy. The ionosphere is strongly influenced by charged particles,...
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Design Example: Identifying the Locations of Monuments in the Field Using Global Positioning System Device01:30

Design Example: Identifying the Locations of Monuments in the Field Using Global Positioning System Device

19
Surveyors use Global Positioning System (GPS) technology to measure the precise location and elevation of points on Earth. In a recent survey, GPS receivers were used to determine the coordinates and elevations of two park monuments. The process involved careful mission planning, data collection, and correction to ensure accuracy. The survey began with mission planning to identify optimal satellite visibility and minimize Position Dilution of Precision (PDOP). A geodetic control point...
19
Field Application of Global Positioning System01:28

Field Application of Global Positioning System

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The Global Positioning System (GPS) has become an indispensable tool in fieldwork, offering unparalleled precision and efficiency for surveying, navigation, and infrastructure development. By harnessing signals from a constellation of satellites, GPS receivers determine the location of objects with remarkable speed and accuracy, often completing calculations within a second.Advantages of Modern GPS TechnologyContemporary GPS receivers are designed to meet the practical demands of field...
24
Introduction to Global Positioning System01:30

Introduction to Global Positioning System

44
The Global Positioning System (GPS) revolutionized positioning on Earth, providing precise location data through satellite ranging. The GPS system was developed in 1978 by the U.S. Department of Defense  for military use, and it became available for civilian applications in 1983, transforming fields including navigation, fleet management, and time synchronization for telecommunications systems.GPS consists of satellites in medium Earth orbit, about 20,200 kilometers above the surface,...
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Types of Global Positioning System Surveys01:30

Types of Global Positioning System Surveys

44
GPS surveying methods vary in application, accuracy, and data collection techniques, catering to diverse surveying and mapping needs. Static GPS, kinematic GPS, and real-time kinematic (RTK) surveying are widely used. Each technique offers distinct advantages.Static GPS involves placing one receiver at a known reference point and another at the target point. It collects exact positional data by observing multiple satellite ranges over an extended period, achieving centimeter-level accuracy for...
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Design Example: Marking Boundaries of a Site Using a Compass01:12

Design Example: Marking Boundaries of a Site Using a Compass

30
Marking site boundaries using a compass is a precise surveying technique that ensures the accuracy of boundary delineation. The process begins by using provided site details, including the bearings and lengths of each boundary line. The initial step involves calculating latitudes and departures for all sides of the site. This computation verifies that the traverse is free of errors, ensuring a closed and accurate boundary.The process starts at a known point, such as Point A, which is often...
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Related Experiment Video

Updated: May 25, 2025

Author Spotlight: UAV Remote Sensing for Efficient Invasive Plant Biomass Estimation
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An Improved UWB Indoor Positioning Approach for UAVs Based on the Dual-Anchor Model.

Zhengrong Xiang1,2, Lei Chen1, Qiqi Wu1

  • 1School of Automation, Guangxi University of Science and Technology, Liuzhou 545006, China.

Sensors (Basel, Switzerland)
|February 26, 2025
PubMed
Summary
This summary is machine-generated.

This study introduces a dual-anchor ultra-wideband (UWB) positioning system for UAVs, reducing deployment costs. The novel approach achieves decimeter-level accuracy, outperforming traditional three-anchor systems.

Keywords:
altitude fusionindoor positioningultra-wideband (UWB)unmanned aerial vehicle (UAV)unscented Kalman filter (UKF)

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Area of Science:

  • Robotics
  • Navigation Systems
  • Sensor Fusion

Background:

  • Ultra-wideband (UWB) technology offers excellent range performance for Unmanned Aerial Vehicle (UAV) indoor positioning.
  • Traditional UWB positioning requires a minimum of three anchors for 3D localization, increasing deployment complexity and cost.
  • Reducing the number of anchors is crucial for practical and economical UAV navigation systems.

Purpose of the Study:

  • To develop a cost-effective UAV positioning model utilizing only two UWB anchors.
  • To enhance positioning accuracy by integrating data from multiple sensors, including rangefinders, barometers, and accelerometers.
  • To improve the reliability of altitude measurements by fusing rangefinder and barometer data.

Main Methods:

  • A dual-anchor positioning model was proposed, projecting 3D positioning onto a 2D horizontal plane using rangefinder altitude data.
  • An altitude fusion method was developed to integrate rangefinder and barometer data, enabling barometer calibration and obstacle avoidance.
  • The Unscented Kalman Filter (UKF) algorithm was employed for multi-sensor data fusion, combining UWB, rangefinder, barometer, and accelerometer data.

Main Results:

  • The dual-anchor model successfully converted 3D positioning into 2D positioning with enhanced accuracy.
  • The altitude fusion method improved altitude measurement reliability, mitigating issues caused by ground obstacles.
  • Simulations and experiments demonstrated that the dual-anchor model achieved decimeter-level positioning accuracy, surpassing the three-anchor model.

Conclusions:

  • The proposed dual-anchor positioning model offers a viable and accurate solution for UAV indoor navigation.
  • Multi-sensor data fusion using UKF significantly enhances positioning precision in the dual-anchor system.
  • This approach provides a practical and cost-effective alternative to traditional multi-anchor UWB positioning systems for UAVs.