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SFOL Pulse: A High Accuracy DME Pulse for Alternative Aircraft Position and Navigation.

Euiho Kim1, Jiwon Seo2,3

  • 1Department of Mechanical & System Design Engineering, Hongik University, 94, Wausan-ro, Mapo-gu, Seoul 04066, Korea. euihokim@hongik.ac.kr.

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Summary
This summary is machine-generated.

This study presents a new Distance Measuring Equipment (DME) pulse shape to improve aircraft navigation accuracy during Global Navigation Satellite System (GNSS) outages. The enhanced DME pulse shape significantly reduces ranging errors, addressing a key limitation of current DME systems.

Keywords:
APNTGNSSdistance measuring equipmentgenetic algorithms

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Area of Science:

  • Aeronautical Engineering
  • Navigation Systems
  • Signal Processing

Background:

  • The Federal Aviation Administration (FAA) plans to maintain and expand Distance Measuring Equipment (DME) infrastructure as a backup for Global Navigation Satellite System (GNSS).
  • Current DME systems suffer from poor distance measuring accuracy beyond 100m, necessitating significant infrastructure expansion for reliable backup.
  • Multipath effects degrade DME accuracy, posing a challenge for its use as a robust GNSS alternative.

Purpose of the Study:

  • To introduce a novel DME pulse shape designed to enhance distance measuring accuracy.
  • To mitigate the impact of multipath effects on DME ranging accuracy.
  • To provide a more accurate and reliable DME system for aircraft navigation, especially during GNSS outages.

Main Methods:

  • Development of a new DME pulse shape using Genetic Algorithms.
  • Evaluation of the proposed pulse shape's susceptibility to multipath effects.
  • Comparison of ranging error reduction with existing DME pulse shapes (Gaussian and Smoothed Concave Polygon).

Main Results:

  • The proposed DME pulse shape demonstrated reduced susceptibility to multipath effects.
  • Ranging error reduction varied between 36.0% and 77.3% compared to Gaussian and Smoothed Concave Polygon pulses.
  • The effectiveness of the error reduction is dependent on the specific noise environment.

Conclusions:

  • The novel DME pulse shape offers a significant improvement in distance measuring accuracy.
  • This advancement addresses a critical limitation of DME as a GNSS backup system.
  • The developed method provides a pathway for more resilient aircraft navigation capabilities.