/// <summary>
/// 计算A,B,C等参数
/// </summary>
/// <param name="sinA0">sinA0</param>
/// <param name="ABC">ABC数组</param>
/// <param name="alpha">alpha</param>
/// <param name="beta">beta</param>
private void CalABC_AlphaBeta(double sinA0, double[] ABC, ref double alpha, ref double beta, ref double gama)
{
double cos2_A0 = 1 - sinA0 * sinA0;
double k_2 = 0;
double e2 = Ell.e2, b = Ell.b;
double e1 = Ell.e1;
k_2 = GeoPro.Getk_2(e2, cos2_A0);
GeoPro.GetABC(b, k_2, ABC);
alpha = GeoPro.GetAlpha(e1, cos2_A0);
beta = GeoPro.GetBeta(e1, cos2_A0);
gama = GeoPro.GetGama(e1, cos2_A0);
}
/// <summary>
/// 趋近法算角度
/// </summary>
/// <param name="dL">初始经度差</param>
/// <param name="cosu2">cosu2</param>
/// <param name="cosu1">cosu1</param>
/// <param name="ab">ab参数数组</param>
/// <param name="lamda">lamda经度差估计值</param>
/// <param name="A1">A1坐标方位角</param>
/// <param name="del">del</param>
/// <param name="cos2_A0">cos2_A0</param>
/// <param name="x">x</param>
private void CalA1_Lamda(double dL, double u2, double u1, double [] ab, ref double lamda, ref double A1,
ref double del, ref double cos2_A0)
{
double deltat = 0, delta = 0;
double cos_del = 0, sin_del = 0;
double e1 = Ell.e1;
double alpha = 0, beta = 0, gama = 0;
double sinA0;
double p = 0;
double q = 0;
lamda = dL;
do
{
deltat = delta;
p = Math.Cos(u2) * Math.Sin(lamda);
q = ab[2] - ab[3] * Math.Cos(lamda);
A1 = Math.Abs(Math.Atan(p / q));
A1 = GeoPro.InvJudgeA1A2(p, q, A1);
sin_del = p * Math.Sin(A1) + q * Math.Cos(A1);
cos_del = ab[0] + ab[1] * Math.Cos(lamda);
del = Math.Atan(sin_del / cos_del);
del = GeoPro.InvJudgedel(del, cos_del);
sinA0 = Math.Cos(u1) * Math.Sin(A1);
double del1 = Math.Atan(Math.Tan(u1) / Math.Cos(A1));
cos2_A0 = 1 - sinA0 * sinA0;
alpha = GeoPro.GetAlpha(e1, cos2_A0);
beta = GeoPro.GetBeta(e1, cos2_A0);
gama = GeoPro.GetGama(e1, cos2_A0);
delta = (alpha * del + (beta) * Math.Cos(2 * del1 + del) * Math.Sin(del)
+ gama * Math.Sin(2 * del) * Math.Cos(4 * del1 + 2 * del)) * sinA0;
lamda = dL + delta;
} while (Math.Abs(delta - deltat) * 206265 > 0.00001);
}