Comments on "propagation modeling over irregular terrain by the improved two-way parabolic equation method"
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KünyeÖZGÜN, Ö., APAYDIN, G., KUZUOĞLU, M., SEVGİ, L. (2014). Comments on "propagation modeling over irregular terrain by the improved two-way parabolic equation method". IEEE Transactions on Antennas and Propagation, 62 (7), pp. 3894-3894. http://dx.doi.org/10.1109/TAP.2014.2328018.
The above paper  is about the two-way split-step parabolic equation method (2W-SSPE) over irregular terrain, and claims that they have developed the “improved” version of the 2W-SSPE approach that has been proposed and validated by us in literature -. The paper  claims to derive the 2W-PE directly from 2D Helmholtz equation. They do this by listing and explaining equations (1)-(9). The authors needed to state that this is quite different from the formulation given in Levy's book (reference  in ). Actually, factorization before or after does not mean anything; their equations (8) and (9) are exactly the same. As a result listing equations (1)-(9) does not mean derivation of the new two-way PE.