CAJ | 학술논문

为了提高海岸区域低频地波传播特性预测精度，研究了基于 J．R．Wait 及 FDTD 全波分析算法的罗兰-C 信号海岸效应预测模型；对罗兰-C 信号传播至海岸线时的电场幅度与相位的空间驻波状扰动现象进行了仿真比较；分析了突变和线性渐变两种陆海分界模型下，该扰动在近海岸区域的地／海面及其上空的分布规律，并指出该扰动存在波前倾斜现象。仿真分析表明：该研究进一步克服了 J．R．Wait 算法的局限，限定了驻波扰动变化量级与其在三维空间的分布范围，有助于同时提高罗兰-C 系统在海岸区域地／海面及空中的导航授时精度。
위료제고해안구역저빈지파전파특성예측정도，연구료기우 J．R．Wait 급 FDTD 전파분석산법적라란-C 신호해안효응예측모형；대라란-C 신호전파지해안선시적전장폭도여상위적공간주파상우동현상진행료방진비교；분석료돌변화선성점변량충륙해분계모형하，해우동재근해안구역적지／해면급기상공적분포규률，병지출해우동존재파전경사현상。방진분석표명：해연구진일보극복료 J．R．Wait 산법적국한，한정료주파우동변화량급여기재삼유공간적분포범위，유조우동시제고라란-C 계통재해안구역지／해면급공중적도항수시정도。
In order to improve the prediction accuracy of the low frequency wave propagation charac-teristics in coastal areas,this paper makes a study of the models for predicting the coast effect in the propagation of a Loran-C signal across the coastline according to J.R.Wait and FDTD methods and a comparison of the standing wave pattern disturbances on the electric field amplitude and phase of a Loran-C signal.The analysis of sharp and linear changes in the two coastline models,disturbance va-lue,3D spatial distribution and change on the earth/sea surface and in the air are carried out.The FDTD results indicate that there is a wavefront tilt phenomenon in the disturbance.The simulation study shows that the limitations of J.R.Wait algorithm can be overcome further so as to determine the standing wave change value and 3D spatial distribution range,which is helpful to improving the navigation/timing accuracy on the earth/sea surface and in the air of the seashore.