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MULTAN法推引相角是以起始套反射开始逐轮进行迭代、扩大。由于起始套中的特殊反射包括确定原点的一般反射取值有限,所以一旦由它们组合的新反射的相角值有较大偏差时,就无法利用MULTAN的多解值特性从自身来缩小它,而只能依靠正切式中的其它项给以弥补。然而,当这种情况发生在相角推引的最初几步时,由于此时往往仅有很少几项参与运算,加之它们的|E|值较大,权也高,势必会左右全过程的成败。处置这类失败的可行办法应该是从分析收敛图入手,改换那些可疑的反射。 本文在一个MULTAN-80失败的例子上进行了7项试验,其结果充分证实了这一切。
The MULTAN method derives the phase angle by iterating and expanding by the beginning of a set of reflections. Since the special reflections in the initial envelope, including the finite reflections that determine the origin, are of limited value, once the phase angle values of the new reflections combined by them have large deviations, they can not be narrowed down by themselves using the multi-solution property of MULTAN , But can only rely on the other items in the tangent to make up. However, when this happens in the first few steps of phase angle derivation, since there are often only a few involved operations at this time, and their larger | E | Success or failure. Possible ways to deal with this failure should start with the analysis of the convergence map, to change those suspicious reflections. This article carried out seven experiments on a MULTAN-80 failure example, the results of which fully confirm all this.