大区域环境下高仰角卫星信号传播的快速计算方法研究OA

The Parabolic Equation(PE)algorithm demonstrates significant advantages in simulating radio wave propagation over large-scale areas.However,it is predominantly applied to near-ground propagation scenarios and is unsuitable for estimating path loss in high-elevation satellite-to-ground links.To address this,a Two-Way PE(2WPE)algorithm adapted to high-elevation satellite signal propagation simulation is investigated,aiming to incorporate the effects of complex terrain and achieve high-precision computation of the electromagnetic situation of satellite signals in large-scale regions.Based on the relative positions of the satellite and the ground station,the incident angle of the satellite signal near the ground is calculated,and the near-ground field strength is estimated using the free-space path loss model.A complex terrain radio wave propagation model is further constructed by integrating digital elevation map and land cover classification algorithms.The 2WPE algorithm is employed to accurately compute both the forward-propagating satellite signal field and the backward-propagating field reflected from complex terrain.In addition,accounting for the high-speed mobility of satellites,the computational plane and stepping grid are adaptively partitioned according to the signal's incident angle to dynamically generate the electromagnetic situation of satellite signals over a fixed area.To verify the correctness of the proposed algorithm,the simulation results of the 2WPE for multi-angle and multi-band satellite signal propagation are compared with theoretical solutions,with a maximum peak error of less than 1%.The 2WPE simulation results for typical wall-based electromagnetic wave propagation scenarios are compared with those obtained by the method of moments,yielding a root mean square error of only 7%.On this basis,a satellite-to-ground link radio wave propagation scenario based on real terrain is established,and simulates the dynamic distribution of the satellite signal's electromagnetic situation.This provides reliable support for satellite ground station site selection and communication assessment.