Sky–ground wave signal separation in enhanced Loran based on Levenberg–Marquart algorithm

Abstract

Abstract This study proposes a high‐precision algorithm used in enhanced Loran sky–ground wave separation based on the Levenberg–Marquart algorithm. The simulation results show that, compared with the existing algorithms, the algorithm proposed in this study has higher accuracy, especially in the case of a low signal‐to‐noise ratio. Furthermore, when the skywave of enhanced Loran has at least a 35 μs time delay compared with the groundwave, the performance of the algorithm is significantly better than that of other algorithms. Analysis of an actual signal showed that the average correlation coefficient was greater than 99% and that the signal was successfully separated.

Keywords

• electromagnetic wave propagation
• enhanced loran signal
• ionospheric electromagnetic wave propagation
• levenberg–marquart algorithm
• sky‐ground wave separation
• signal processing