Parabolic Equation Method for Loran-C ASF Prediction Over Irregular Terrain

The parabolic equation (PE) method is employed to solve the Loran-C additional secondary factors (ASFs) over irregular terrain. Based on the split-step Fourier transform (SSFT) algorithm, the method has been proven to be numerically efficient. The ASF results are compared to those of the integral equation (IE) method and the finite-difference time-domain (FDTD) method. Very good agreements are observed. The computational time of the PE method is several orders less than that of the other two. The memory requirement is similar to the IE, and less than the FDTD method.

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