[7] [7] BARRIOS E.A terrain parabolic equation model for pro-pagation in the troposphere［J］.IEEE Transactions on Antennas and Propagation,1994,42:90-98.

[8] [8] KUTTLER J R, DOCKERY G D.Propagation modeling over terrain using the parabolic wave equation［J］.IEEE Transactions on Antennas and Propagation, 2000, 48:260-277.

[12] [12] DOCKERY G D, KUTTLER J R.An improved impen-dence-boundary algorithm for Fourier split-step solution of the parabolic wave equation［J］.IEEE Transactions on Antennas and Propagation,1996,44(12):1592-1599.