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Estimation of the TOA performance of Loran-C
Responsible organisation
2004 (English)Conference paper, (Refereed) Published
Abstract [en]

Loran-C is a navigational aid that relies on the ability to make correct estimates of the Times of Arrival (TOAs) of signals received over a noisy radio channel. How good is the performance of Loran-C in this respect? Is it close to optimal? Are there perhaps better estimation techniques available than we currently employ? In this paper we use Estimation Theory to find the optimal limit of the accuracy of TOA estimates, for a given signal-to-noise ratio (SNR). Specifically, we compute the Cramer-Rao Lower Bound (CRLB) which specifies the absolute minimum error variance that can be achieved by an unbiased estimator. From the CRLB we can estimate the best repeatable accuracy that can be attained using a set of TOAs. We compute here the CRLBs for the TOA of a Loran-C signal with both Additive White Gaussian Noise (AWGN) and Additive Coloured Gaussian Noise (ACGN). We then employ the Maximum Likelihood Estimator (MLE) and compare its results with that of CRLB. Simulation results show that the MLE approaches the minimum variance obtained by CRLB for SNR values of practical and reliable Loran-C operation.

Place, publisher, year, edition, pages
2004.
Keyword [en]
TOA, Estimation of TOA, CRLB, ACGN
National Category
Signal Processing
Identifiers
URN: urn:nbn:se:bth-9541Local ID: oai:bth.se:forskinfoCC494983AB92D14EC1256F6900532F49OAI: oai:DiVA.org:bth-9541DiVA: diva2:837412
Conference
The International LORAN Association's 2004 Convention and Technical Symposium
Available from: 2012-09-18 Created: 2004-12-13 Last updated: 2015-06-30Bibliographically approved

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CiteExportLink to record
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Citation style
  • apa
  • harvard1
  • ieee
  • modern-language-association-8th-edition
  • vancouver
  • Other style
More styles
Language
  • de-DE
  • en-GB
  • en-US
  • fi-FI
  • nn-NO
  • nn-NB
  • sv-SE
  • Other locale
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Output format
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  • asciidoc
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