A very powerful method of predicting single-frequency TM sub rho ground wave propagation over irregular and/or inhomogeneous terrain is by a Volterra integral equation, based on Compensation Theorem for inhomogeneities is discussed. Such a treatment utilizes terrain elevation and surface impedance profiles and neglects backscatter and variations transverse to the propagation path. For very rough terrains, the computed relative field (attenuation) function may become physically unrealistic, indicating the need to include backscatter. For this situation a modified Volterra treatment with a first-order Fredholm integral equation correction is appealing.
NASA STI/Recon Technical Report N
- Pub Date:
- June 1989
- Electromagnetic Wave Transmission;
- Integral Equations;
- Communications and Radar