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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...
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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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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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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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Introduction to Global Positioning System01:30

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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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When measuring distances in areas with physical obstructions, such as a lake in a field, surveyors must employ techniques to calculate accurate lengths without direct line measurements. One effective method is the offset technique, which allows for precise distance estimation over inaccessible stretches.In this scenario, a surveyor must measure a side of an area that crosses a lake. Since the measuring tape cannot span the lake, the surveyor begins by establishing a baseline that aligns with...
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Precise Point Positioning Algorithm for Pseudolite Combined with GNSS in a Constrained Observation Environment.

Chuanzhen Sheng1,2, Xingli Gan1,2, Baoguo Yu1,2

  • 1State Key Laboratory of Satellite Navigation System and Equipment Technology, Shijiazhuang 050081, China.

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Summary
This summary is machine-generated.

This study introduces a Global Navigation Satellite System (GNSS) Precision Point Positioning (PPP) algorithm combined with pseudolites (PLS) for accurate positioning in urban canyons. The enhanced method improves positioning availability and accuracy, even with limited GNSS signals.

Keywords:
GNSS/pseudolite precise point positioningambiguity resolution and validationdistributed pseudolitehigh-precision time synchronizationlow-cost receiverurban canyon

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Area of Science:

  • Geomatics Engineering
  • Satellite Navigation Systems
  • Geodesy

Background:

  • Urban canyons present significant challenges for Global Navigation Satellite System (GNSS) due to signal obstruction and multipath errors.
  • High-precision, continuous positioning is crucial for public users in complex urban environments.

Purpose of the Study:

  • To develop and evaluate a Global Navigation Satellite System (GNSS) Precision Point Positioning (PPP) algorithm integrated with pseudolites (PLS).
  • To overcome limitations of existing pseudolite PPP techniques, such as reliance on known points and time synchronization.

Main Methods:

  • Introduced a real-time equivalent clock error estimation algorithm for pseudolite PPP.
  • Implemented ambiguity fixing and validation methods to improve positioning accuracy.
  • Conducted experiments using a low-cost receiver in urban canyon environments.

Main Results:

  • Achieved accuracy better than 0.15 m with sufficient GNSS satellites (>7) and fixed ambiguity.
  • Obtained accuracy better than 0.3 m with limited GNSS (<4) using pseudolite support.
  • Demonstrated accuracy better than 0.5 m with only four pseudolites, even without GNSS signals.

Conclusions:

  • The proposed pseudolite/GNSS PPP algorithm significantly enhances positioning availability in GNSS-constrained environments like urban canyons.
  • The method provides reliable high-precision positioning even with reduced or absent GNSS signals.