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本文分析了地面移动无线系统中不平坦地形区场强预测的六种已知方法,从中选择一种最适合于工程用途的方法。为了验证这些预测方法的精确度,还进行了综合性场强测量。借助于测试车,测量指定路径各点的场强,并对这些记录数据用统计方法处理,得到参考路径上许多测试点的平均场强值作为判断预测精确度基准值。文中还讨论了比较这几种方法优劣的其他一些特点,诸如其有效性,复杂性、使用计算机的可能性、种种主观因素的影响以及初始数据的估计误差等。在经过一系列讨论剖析之后,选定一种最近提出的“无障碍角”方法——“Clearance angle方法”为工程上最合适的场强预测方法,在本文场强测试一节中已用大量实测数据加以验证。
This paper analyzes six known methods of field strength prediction for uneven terrain in terrestrial mobile wireless systems, choosing one that is most suitable for engineering applications. In order to verify the accuracy of these prediction methods, a comprehensive field strength measurement was also performed. With the help of test car, the field strength of each point in the designated route is measured. The statistical data of these recorded data are processed. The average field strength of many test points in the reference route is obtained as the reference value for predicting the accuracy of prediction. The paper also discusses some other features that compare the advantages and disadvantages of these methods, such as its validity, complexity, the possibility of using a computer, the influence of various subjective factors and the estimation error of the initial data. After a series of discussion and analysis, we choose a recently proposed “Barrier Angle ” method - “Clearance angle method ” as the most suitable field strength prediction method in engineering. In this paper, In a large number of measured data to be verified.