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本方法的关键在于建立对最小可见频率f_(min)以上包括九至十五个视高h′数据的同步换算范围进行精确可靠的换算方法。对同步换算范围给出三个各包含二个未知数的高层模式,对f_(min)以下给出六或八个各包含二个未知数的低层模式。按照最小二乘法对每一条频高曲线最多可以得到二十个各不相同的换算结果。通过一定的方法可以从中挑选出精确的结果。对468条其形状、临界频率f_c、半厚H以及f_(min)各不相同的其精度为0.1公里左右的理论夜间频高曲线进行了换算。其中462条曲线的极大换算误差不超过5公里,6条曲线介于5公里至9公里之间。
The key point of this method is to establish an accurate and reliable conversion method for the synchronous conversion range including data of nine to fifteen hv above the minimum visible frequency f_ (min). Three high-level modes, each containing two unknowns, are given for the synchronous scaling range, and six or eight low-level modes, each containing two unknowns, are given below f_ (min). According to the least square method for each frequency-height curve can get up to twenty different conversion results. Through a certain method can be selected from the precise results. 468 theoretical nighttime frequency curves whose shapes, critical frequencies f_c, half-thicknesses H and f_ (min) are different and whose accuracy is about 0.1 km are converted. 462 of which great conversion error of not more than 5 km, 6 curves between 5 km to 9 km.