Use this URL to cite or link to this record in EThOS: https://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.782170
Title: eLoran service volume coverage prediction
Author: Lebekwe, Caspar
ISNI:       0000 0004 7967 7769
Awarding Body: University of Bath
Current Institution: University of Bath
Date of Award: 2018
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Abstract:
This thesis answers the following research questions: 1. Given the current transmitter configuration, what is the accuracy, availability, and continuity performance of the coverage network in the General Lighthouse Authorities of United Kingdom and Ireland's geographical area if differential eLoran is only applicable at harbour and port locations? 2. What is the best method of placing the reference stations in the coverage area given the constraints? The previous work done by other researchers has been extended to include an improved accuracy model that accounts for the variation of signal delays due to conductivity changes along the path from the transmitter to the user and weather changes experienced at the user's location. Availability and continuity models have been derived using historical transmitter off-air data obtained from Loran control centre located in Brest, France. Ananalytical model that accounts for additional secondary factor delay over a flat terrain has been modelled and included in the coverage tool. A model which determines the optimization of the separation distance between any two given reference stations has been developed herein. All these techniques have been built into the GLAs coverage software tool thereby extending the software tool's capability to evaluate accuracy, availability and continuity at any location in the GLAs coverage area. Accuracy, availability and continuity are part of the four eLoran system performance parameters. The other performance parameter called integrity is discussed but not modelled in this thesis. The developed coverage software tool enables administrators overseeing the movement of ships into harbours and in coastal waters to ensure that system performance requirements of accuracy, availability and continuity are met within the chosen geographical area. Administrators can select transmitters to be used to predict coverage, identify and plan where new transmitters and reference stations need to be installed to meet international standards for accuracy, availability and continuity, giving a safe and reliable service. The developed coverage tool's outputs serve as a guide to administrators as to whether resources such as reference stations are optimized or not.
Supervisor: Astin, Ivan ; Smith, Nathan Sponsor: Not available
Qualification Name: Thesis (Ph.D.) Qualification Level: Doctoral
EThOS ID: uk.bl.ethos.782170  DOI: Not available
Keywords: eLoran ; Accuracy
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