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Related Concept Videos

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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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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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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Interference: Path Lengths01:10

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1.3K
Consider two sources of sound, that may or may not be in phase, emitting waves at a single frequency, and consider the frequencies to be the same.
Two special sources may be considered when they are in phase. This can be easily achieved by feeding the two sources from the same source. An example would be synchronizing the two speakers by feeding them with the same source, such as the sound waves produced by a tuning fork. This setup ensures that the two sources have the same frequency and are...
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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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Updated: Jul 5, 2025

Implementation of a Reference Interferometer for Nanodetection
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Software Defined Radio for GNSS Radio Frequency Interference Localization.

Fred Taylor1, Evan Gattis1, Lucca Trapani1

  • 1Ann and H.J. Smead Aerospace Engineering Sciences, University of Colorado Boulder, Boulder, CO 80303, USA.

Sensors (Basel, Switzerland)
|January 11, 2024
PubMed
Summary
This summary is machine-generated.

New low-cost radio hardware like the KrakenSDR shows promise for Global Navigation Satellite System (GNSS) interference detection. Testing confirms its phase coherence and angle of arrival capabilities for improved GNSS signal security.

Keywords:
global positioning system (GPS)radio direction findingsoftware defined radio (SDR)

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Area of Science:

  • Radio Frequency Engineering
  • Signal Processing
  • Navigation Systems

Background:

  • Harmful interference in Global Navigation Satellite System (GNSS) bands is a persistent challenge.
  • Advances in commercial off-the-shelf (COTS) radio hardware enable new solutions for interference detection.
  • Phase coherent receiver platforms offer potential for improved GNSS signal monitoring.

Purpose of the Study:

  • To test and characterize the KrakenSDR, a low-cost, compact, phase coherent receiver platform.
  • To evaluate the KrakenSDR's suitability for Global Navigation Satellite System (GNSS) applications, particularly interference identification.
  • To assess the performance of angle of arrival (AoA) estimation and related metrics.

Main Methods:

  • Benchtop and field testing of the KrakenSDR platform.
  • Characterization of phase coherence and AoA estimation accuracy.
  • Analysis of received signal strength indicators (RSSI) and AoA confidence values.
  • Testing at 900 MHz and 1575.42 MHz (GNSS L1 band).

Main Results:

  • KrakenSDR demonstrated phase coherence and AoA estimates within array-dependent resolution bounds.
  • RSSI and AoA confidence values correlated strongly with AoA estimate quality.
  • The platform proved capable of operating at GNSS frequencies.

Conclusions:

  • The KrakenSDR is a viable, low-cost platform for GNSS interference detection and signal monitoring.
  • Its performance metrics provide valuable insights into signal quality and direction.
  • Calibration of active antenna arrays is crucial for accurate AoA estimation in GNSS signal collection.