Navigation Accuracy Improvement Using a New Integrated Algorithm of TOA/TDOA in Ground-based Loran Systems

For positioning in navigation systems¡ at first the signal arrival time or arrival time differences is calculated and then the time differences is converted to geographical Lat/Long information using a specific algorithm. The aim of this study is to analyze the integrated algorithms for estimation of arrival time in order to improve positioning accuracy in ground-based loran systems. For this goal¡ the common algorithms of arrival time and arrival time difference were investigated firstly and were compared based on CRLB approach. Afterwards¡ by calculating RMSE index the performance of the suggested algorithm was evaluated using information of three transmitter stations. The results have shown that the proposed approach had promising performance in compare to TOA (the lower noise variances and the minimum error) algorithm.