Algorithms for LORAN-C time difference error minimization
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Authors
Cristi, Roberto
Tummala, Murali
France, Frederick M. Jr.
Subjects
Advisors
Date of Issue
1998-01
Date
Publisher
Naval Postgraduate School
Language
en_US
Abstract
The United States Coast Guard (USCG) is in the process of upgrading the hardware of the LORAN-C Radionavigational System Control System. As part of this effort, the Computer-Assisted LORAN-C Controller (CALOC), is also in need of improvement. CALOC performs four tasks: abnormality detection, time difference control, recordkeeping and blink control. The work reported in this report focuses on time difference control. In many instances, CALOC does not accurately control the time difference error (TDE) within the established USCG control procedures. Two new algorithms are proposed here to control TDE more effectviely; a proportional-integraal-derivation (PID) controller and a Kalman filer. Actual TDE data recorded at three different master stations covering five LORAN-C chains is used to evaluate the performance of the proposed controllers. The PID controller shows a substantial improvement in control compared to CALOC, and the Kalman filter exhibits even better performance, based on preliminary results. This improvement i control correlates directly with an increase in both predictable accuracy and repeatable accuracy.
Type
Technical Report
Description
Series/Report No
NPS-EC-98-002
Department
Electrical and Computer Engineering
Identifiers
NPS Report Number
NPS-EC-98-002
Sponsors
U.S. Coast Guard, LORAN Support Unit, Wildwood, NJ 08260-3232