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Related Concept Videos

Errors in Global Positioning System01:26

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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Common Leveling Mistakes and Errors01:17

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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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Distance Corrections01:15

Distance Corrections

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To achieve precise distance measurements, especially in surveying and construction, certain corrections must be applied to account for potential sources of error like the standardization errors, temperature variations, and slope adjustments.Standardization error emerges when measurement equipment undergoes changes, such as wear, repairs, or weather impacts. To address this, surveyors compare the equipment’s readings to a standard. This process identifies any deviation that might lead to...
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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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Influence of Earth's Curvature and Atmospheric Refraction on Leveling01:26

Influence of Earth's Curvature and Atmospheric Refraction on Leveling

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During leveling, the Earth's curvature and atmospheric refraction introduce deviations in the line of sight from a true horizontal reference. When the line of sight is leveled, it remains perpendicular to the plumb line only at a single point. Beyond this, it deviates due to the Earth’s curvature, represented by the correction C. For a sight distance D, the deviation can be derived using the relationship:This relationship shows that the deviation increases quadratically with distance.
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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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A Method for Correcting Signal Aberrations in Ultrasonic Indoor Positioning.

Riccardo Carotenuto1, Demetrio Iero1,2, Massimo Merenda1,2

  • 1Department of Information Engineering, Infrastructure and Energy Sustainable (DIIES), Mediterranea University of Reggio Calabria, 89124 Reggio Calabria, Italy.

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Summary
This summary is machine-generated.

A new technique improves indoor positioning accuracy by analyzing the symmetry of distorted ultrasonic signals, overcoming limitations of traditional peak detection methods for reliable tracking.

Keywords:
acoustic SNRacoustic signal aberrationcross-correlation aberrationultrasonic ranging

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Area of Science:

  • Acoustics
  • Signal Processing
  • Indoor Positioning Systems

Background:

  • Indoor positioning is crucial for many applications, driving demand for accurate tracking technologies.
  • Ultrasonic systems offer good accuracy and refresh rates for indoor positioning.
  • Linear chirp signals used in ultrasonic ranging can suffer from shape aberration due to acoustic diffraction.

Purpose of the Study:

  • To address the limitations of classical cross-correlation techniques in ultrasonic positioning caused by signal aberration.
  • To propose and evaluate an alternative range estimation technique that leverages the symmetry of aberrated cross-correlation functions.

Main Methods:

  • Numerical simulations using Field II acoustic simulation software.
  • Comparison of classical global peak detection with a proposed symmetry-based technique.
  • Analysis under various conditions including acoustic reflections and noise levels.

Main Results:

  • The proposed technique accurately estimates range even with severe cross-correlation shape aberrations.
  • Effective performance is demonstrated at signal-to-noise ratio levels typical for indoor environments.
  • The method accommodates reflections and noise, enabling reliable indoor positioning.

Conclusions:

  • The novel symmetry-based technique overcomes classical cross-correlation errors in ultrasonic positioning.
  • It allows the use of larger transducer apertures, increasing acoustic power and improving SNR.
  • This enhances the feasibility of robust indoor positioning solutions.