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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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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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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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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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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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A Precise and Stable Space-Based Time System for Navigation in Smart Cities.

Shaoqian Li1,2,3,4, Baojun Lin1,2,3,4,5, Rui Li2,3,4

  • 1Aerospace Information Research Institute, Chinese Academy of Sciences, Beijing 101408, China.

Sensors (Basel, Switzerland)
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Summary
This summary is machine-generated.

A new space-based time system enhances satellite navigation for smart cities. This precise system improves timekeeping accuracy and stability, crucial for reliable positioning services.

Keywords:
inter-satellite linksatellite navigation systemsmart cityspace-based time system

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Area of Science:

  • * Satellite Navigation Systems
  • * Smart City Applications
  • * High-Accuracy Timekeeping

Background:

  • * High-accuracy and high-stability space-based time systems are essential for Quality of Service (QoS) in satellite navigation for smart cities.
  • * Current systems require precise time references for reliable navigation and positioning.

Purpose of the Study:

  • * To propose a precise and high-stability space-based time system using an autonomous time scale.
  • * To research the generation, maintenance, and transfer of high-precision space-based time references.
  • * To improve satellite clock offset modeling and prediction for enhanced navigation services.

Main Methods:

  • * Development of a centralized time comparison method using the ALGOS algorithm for inter-satellite link two-way time comparison.
  • * Simultaneous estimation of clock difference, speed, and drift parameters for satellites relative to a reference.
  • * Utilizing relative clock difference observations from all satellite links over a period.

Main Results:

  • * Demonstrated high accuracy and stability of the proposed space-based time system under an autonomous time scale reference.
  • * Achieved significantly higher clock offset monitoring arc coverage compared to direct observation methods.
  • * Validated the system's efficiency using real-world data from the Beidou navigation system.

Conclusions:

  • * The proposed space-based time system effectively meets the demands for high-accuracy and high-stability timekeeping in smart city navigation.
  • * The system offers superior clock offset monitoring capabilities, enhancing the reliability of satellite navigation.
  • * This research provides a robust framework for advanced satellite clock offset modeling and prediction.