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Errors in Global Positioning System01:26

Errors in Global Positioning System

282
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,...
282
Types of Global Positioning System Surveys01:30

Types of Global Positioning System Surveys

273
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...
273
Introduction to Global Positioning System01:30

Introduction to Global Positioning System

383
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,...
383
Field Application of Global Positioning System01:28

Field Application of Global Positioning System

265
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...
265
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

337
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...
337
Common Leveling Mistakes and Errors01:17

Common Leveling Mistakes and Errors

363
A survey team is tasked with determining the elevation difference between points Point A and Point B, separated by uneven terrain. They use a leveling instrument and a leveling rod.Common MistakesMisreading the Rod: During a backsight reading at Point A, the instrumentman observes the rod partially obscured by tall grass. Instead of reading 1.135 m, they mistakenly record 1.735 m due to the misalignment of the crosshair with the wrong graduation. This error adds 0.600 m to all subsequent...
363

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Related Experiment Video

Updated: Jan 3, 2026

Continuous-Wave Propagation Channel-Sounding Measurement System - Testing, Verification, and Measurements
09:36

Continuous-Wave Propagation Channel-Sounding Measurement System - Testing, Verification, and Measurements

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A Triple Checked Partial Ambiguity Resolution for GPS/BDS RTK Positioning.

Liguo Lu1,2,3, Liye Ma4, Wanke Liu5

  • 1Faculty of Geomatics, East China University of Technology, Nanchang 330013, China.

Sensors (Basel, Switzerland)
|November 23, 2019
PubMed
Summary
This summary is machine-generated.

Triple Checked Partial Ambiguity Resolution (TC-PAR) improves Global Navigation Satellite System (GNSS) positioning by selecting a subset of ambiguities. This method enhances the success rate of fixing ambiguities while maintaining centimeter-level baseline precision.

Keywords:
GPS/BDS RTK positioningbaseline precision defectbootstrapping success ratebounded fixed-failure ratio testpartial ambiguity resolution

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Area of Science:

  • Geomatics Engineering
  • Satellite Navigation Systems

Background:

  • High-precision Global Navigation Satellite System (GNSS) positioning relies on accurate carrier phase ambiguity resolution.
  • Modern GNSS advancements present challenges in fixing a high number of ambiguities completely and correctly.

Purpose of the Study:

  • To introduce a novel partial ambiguity resolution method to enhance the success rate and reliability of GNSS positioning.
  • To evaluate the performance of the proposed method against established techniques.

Main Methods:

  • Developed the Triple Checked Partial Ambiguity Resolution (TC-PAR) method, incorporating bootstrapping success rate, bounded fixed-failure ratio test, and baseline precision defect for ambiguity subset selection.
  • Utilized a model and data dual-driven approach for partial ambiguity resolution.
  • Compared TC-PAR with the full-fixed LAMBDA method using metrics like fixed rate, fixed success rate, correct fixed rate, precision defect, and Root Mean Square (RMS) of baseline solution.

Main Results:

  • TC-PAR significantly improves the success rate of ambiguity fixing.
  • The method achieves comparable centimeter-level baseline precision to the LAMBDA method after ambiguity fixing.
  • TC-PAR demonstrates robust performance in challenging GNSS ambiguity resolution scenarios.

Conclusions:

  • Partial ambiguity fixing, specifically TC-PAR, offers a viable strategy to overcome limitations in high-dimensional ambiguity resolution.
  • TC-PAR provides a reliable and accurate approach for achieving high-precision GNSS positioning, comparable to traditional full-fixing methods.