Calculation by computer Clause Samples

Calculation by computer. The calculation of the usable field strength with the simplified multiplication method is based on the probability integral for a normal distribution: 2π L( x) = 1 × ∫ −∞ − t 2 dt This integration can, however, be avoided in the practical calculation by replacing it with a polynomial approximation as follows: with a1 = 0.196854 a2 = 0.115194 a3 = 0.000344 a4 = 0.019527 L(x) = 1 – ½(1 + a1x + a2x2 + a3x3 + a4x4)–4 + ε(x) ε(x) represents the error between the approximation and the exact value, obtained by the probability integral. Since |ε(x)| is less than 2.5 . 10–4, this error can be neglected. The above approximation was used to calculate the multiple interference by the simplified multiplication method.