DEM在电视塔定位中应用的研究

Study on the Application of DEM in the Location of TV Tower

本文应用DEM(Digital Elevition Model)的理论,根据电视波在大气中传输的规律,计算出某电视塔在区域的覆盖面积,借助一个计算机程序,通过对区域的地形分析,自动地对最佳电视塔位进行预估,最后准确地对电视塔定位。根据该塔位的覆盖面积与塔高的关系(或根据覆盖面积的要求)确定最佳塔高。从而实现区域内以最低塔高覆盖面积较大(或满足覆盖面积的要求)之设想。

This paper presents a method of determining the optimal position and height of TV tower by means of computing the area covered by TV wave. This method is based mainly on the theory of DEM (Digital Elevation Model)and the spreading law of TV wave. In the method the position of the tower is predicted with a computer programme after the terrain in which the TV tower will be set up is analyzed, and the optimal position of the tower can be obtained automatically according to the predicted position. The optimal height of the tower is found in light of the relation- ship between the position and the height of the tower, thus a TV tower with lowest height and largest covering area can be realized. An illustrative example is presented.