Abstract
The non-homogeneous earth surface causes warpage of the Loran-C signal and induces a bias error on the measurements for the time of arrival. The purpose of this paper is to decrease this error, using the correction value calculated from the Envelope to Cycle Difference of the received pulse signal itself. In our previous study, we assumed the ECD variation model for the mixed propagation path. To appreciate that model and to indicate the advantage of the correction values, the experiment was carried out in the domain of the 9970 Loran-C chain. Using the results of this experiment, we can describe as follows, 1. The ECD had a correspond value at the same position, in proof of repeatability. 2. There were significant changes in the ECD values over the land propagation. 3. The fixed position by the corrected time differences from above method were closer to the fixed position by NNSS than case of non-corrected one.
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