a2.m

迭代实现非线性函数（电离层延迟模型）的参数拟合问题

function A2=a2(alpha0,alpha1,alpha2,alpha3,fm)
A2=alpha0+alpha1*fm+alpha2*fm*fm+alpha3*fm*fm*fm;
%A2=5.5-0.00000000001*(fm-35)^2
if A2<=0;
    A2=0;
    %A2=1;
end