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Introduction to Global Positioning System01:30

Introduction to Global Positioning System

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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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Field Application of Global Positioning System01:28

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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...
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Errors in Global Positioning System01:26

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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

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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...
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Types of Global Positioning System Surveys01:30

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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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Azimuths and bearings are essential concepts in surveying, providing methods to express the direction of a line relative to a meridian. Azimuths refer to the clockwise angle measured from the north end of a reference meridian to the given line, ranging from zero to 360 degrees. This method gives a comprehensive directional reference within a full 360-degree circle, making it a straightforward way to communicate direction in various fields, including navigation, cartography, and...
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Precise point positioning with the BeiDou navigation satellite system.

Min Li1, Lizhong Qu2, Qile Zhao3

  • 1GNSS Research Center, Wuhan University, No.129 Luoyu Road, Wuhan 430079, China. limin@whu.edu.cn.

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Summary
This summary is machine-generated.

BeiDou-2 navigation satellite performance was assessed using precise point positioning (PPP). Combining BeiDou with GPS significantly improved kinematic PPP accuracy and reduced convergence time.

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Area of Science:

  • Geomatics Engineering
  • Satellite Navigation Systems
  • Geodesy

Background:

  • China launched 16 BeiDou-2 navigation satellites by the end of 2012, offering initial navigation services in the Asia-Pacific region.
  • Assessing the navigation and positioning performance of the BeiDou-2 system is crucial for its widespread adoption and application.

Purpose of the Study:

  • To evaluate the navigation and positioning performance of the BeiDou-2 system.
  • To implement and analyze BeiDou-only and combined BeiDou/GPS precise point positioning (PPP).

Main Methods:

  • Establishment of a global network of BeiDou Experimental Tracking Stations (BETS).
  • Modification of Position and Navigation Data Analyst (PANDA) software for orbit determination and precise product generation.
  • Processing of BeiDou/GPS observations using static and kinematic Precise Point Positioning (PPP) techniques.

Main Results:

  • BeiDou static and kinematic PPP achieved centimeter-level precision.
  • Combined BeiDou/GPS kinematic PPP solutions showed significant improvement over BeiDou-only or GPS-only solutions.
  • Integration of BeiDou and GPS systems reduced PPP convergence time.

Conclusions:

  • The BeiDou-2 system demonstrates high precision for navigation and positioning applications.
  • Combining BeiDou with GPS enhances kinematic PPP performance, offering faster convergence and improved accuracy.
  • The findings support the utility of BeiDou in global navigation satellite systems.