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Related Concept Videos

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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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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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Simple Harmonic Motion and Uniform Circular Motion01:42

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While simple harmonic motion and uniform circular motion may be two separate concepts, they correlate and interlink with each other. Simple harmonic motion is an oscillatory motion in a system where the net force can be described by Hooke's law, while uniform circular motion is the motion of an object in a circular path at constant speed.
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Theoretical Upper and Lower Limits for Normalized Bandwidth of Digital Phase-Locked Loop in GNSS Receivers.

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Table-Based Adaptive Digital Phase-Locked Loop for GNSS Receivers Operating in Moon Exploration Missions.

Young-Jin Song1, Jong-Hoon Won1

  • 1Department of Electrical and Computer Engineering, Inha University, Incheon 22212, Republic of Korea.

Sensors (Basel, Switzerland)
|December 23, 2022
PubMed
Summary

A novel table-based adaptive digital phase-locked loop (DPLL) offers efficient signal tracking in Global Navigation Satellite System (GNSS) receivers. This computationally efficient method enhances performance in harsh environments without compromising jitter metrics.

Keywords:
GNSS receiverMoon exploration missionadaptive digital phase-locked looplook-up table

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Area of Science:

  • Electrical Engineering
  • Signal Processing
  • Aerospace Engineering

Background:

  • Adaptive digital phase-locked loops (DPLLs) are crucial for Global Navigation Satellite System (GNSS) receivers to track signals.
  • Conventional adaptive DPLLs exhibit high computational complexity, limiting their application in resource-constrained environments.
  • Harsh operational conditions, such as those in space missions, pose significant challenges for signal tracking stability.

Purpose of the Study:

  • To propose a computationally efficient table-based adaptive DPLL for GNSS receivers.
  • To optimize the noise bandwidth adjustment for improved stability and performance in challenging environments.
  • To reduce the computational complexity of adaptive DPLLs while maintaining signal tracking accuracy.

Main Methods:

  • A table-based adaptive DPLL approach was developed, utilizing pre-computed noise bandwidth values.
  • Noise bandwidth table values were optimized considering thermal noise, oscillator phase noise, and dynamic stress.
  • A method for calculating optimal integration time was presented to ensure loop filter stability.
  • Simulations were conducted using trajectory data from a Moon exploration mission.

Main Results:

  • The proposed table-based adaptive DPLL demonstrated stable operation in simulated harsh environments where conventional fixed-bandwidth loops failed.
  • The algorithm achieved phase jitter performance comparable to existing adaptive DPLLs.
  • Execution time was significantly reduced, being 2.4-5.4 times faster than conventional adaptive DPLLs.
  • Computational efficiency was verified without sacrificing jitter performance.

Conclusions:

  • The table-based adaptive DPLL offers a computationally efficient solution for GNSS signal tracking.
  • The algorithm provides robust performance in challenging environments, crucial for applications like space exploration.
  • This approach represents a significant advancement in adaptive DPLL design for GNSS receivers.