Besides, a global ray-tube tracing method is presented, which is to trace the global wave tubes instead of the many small ray tubes for simulating wave propagations in urban areas.

• 另外，本论文提出广射线柱追踪法，其中乃是追踪整体射向建筑物表面之辐射电波，有别于一般射线追踪法将发射天线的辐射电波以多个小射线柱来模拟。