LORAN-C receiver position estimation from noisy time-difference data Public Deposited

http://ir.library.oregonstate.edu/concern/graduate_thesis_or_dissertations/nc580q24z

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  • In order to analyze the accuracy of the navigation system LORAN-C, we have collected time - difference (TD) data from the U.S. west coast chain (9940) at a fixed receiver location (Corvallis, Oregon). The analysis of the TD data shows an unexpected high correlation between the TDs as well as a repetitive error pattern with a period of 119.1 seconds which is traced to cross-rate interference (CRI) from the Cana- dian west-coast chain (5990). For each TD, we extract the periodic error pattern, and then subtract it from the corresponding TD. For a receiver in Corvallis, the observed errors due to CRI ranged over 40 nanoseconds (TDW), 60 nanoseconds (TDX), and 120 nanoseconds (TDY). The constant and time-varying TD errors and the resulting constant and time-varying position errors for the location Corvallis are computed both before and after subtraction of the CRI component. As a result, we find that in addition to CRI another non -white TD error (yet unknown) must be considered.
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