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Errors in Global Positioning System

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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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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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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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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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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...
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Positioning Performance Limits of GNSS Meta-Signals and HO-BOC Signals.

Lorenzo Ortega1, Daniel Medina2, Jordi Vilà-Valls3

  • 1Telecommunications for Space and Aeronautics Lab (TéSA), 31500 Toulouse, France.

Sensors (Basel, Switzerland)
|July 8, 2020
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Summary
This summary is machine-generated.

New Global Navigation Satellite Systems (GNSS) signals offer precise positioning, navigation, and timing (PNT) solutions in challenging environments. GNSS meta-signals provide the best performance, regardless of satellite geometry or conditions.

Keywords:
Cramér–Rao boundGNSSGNSS meta-signalsSPP and RTK positioninghigh-order BOC signalsprecise positioningtime-delay and phase ML estimation

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Area of Science:

  • * Satellite Navigation Systems
  • * Signal Processing
  • * Intelligent Transportation Systems

Background:

  • * Global Navigation Satellite Systems (GNSS) are crucial for Position, Navigation, and Timing (PNT).
  • * Current GNSS face limitations in providing precise PNT in harsh environments.
  • * Advanced signal designs are needed to meet stringent performance requirements for next-generation applications.

Purpose of the Study:

  • * To assess the performance limits of high-order Binary Offset Carrier (HO-BOC) modulations and GNSS meta-signals.
  • * To evaluate the translation of signal estimation performance into positioning accuracy for Single Point Positioning (SPP) and Real-Time Kinematic (RTK) solutions.
  • * To identify optimal GNSS signals for precise PNT in adverse propagation conditions.

Main Methods:

  • * Analysis of time-delay and phase Maximum Likelihood (ML) estimation performance.
  • * Consideration of signal bandwidth limitations and receiver capabilities (e.g., 60 MHz, 135 MHz).
  • * Evaluation across various satellite constellation geometries and propagation conditions.

Main Results:

  • * For receivers limited by bandwidth, L1-M or E6-Public Regulated Service (PRS) signals are recommended.
  • * For receivers operating at 60 MHz, the full-bandwidth Galileo E5 signal is suggested.
  • * GNSS meta-signals (E5 + E6 or B2 + B3) operating at 135 MHz offer the best overall robustness and performance.

Conclusions:

  • * GNSS meta-signals demonstrate superior performance for precise PNT in challenging environments.
  • * Signal bandwidth and receiver capabilities are critical factors in selecting optimal GNSS signals.
  • * The findings guide the development of next-generation PNT systems for safety-critical applications.