nvector._core.p_EB_E2n_EB_E

p_EB_E2n_EB_E(p_EB_E, a=6378137, f=0.0033528106647474805, R_Ee=None)

Converts Cartesian position vector in meters to n-vector.

Parameters:

p_EB_E: 3 x n array

Cartesian position vector(s) from E to B, decomposed in E.

a: real scalar, default WGS-84 ellipsoid.

Semi-major axis of the Earth ellipsoid given in [m].

f: real scalar, default WGS-84 ellipsoid.

Flattening [no unit] of the Earth ellipsoid. If f==0 then spherical Earth with radius a is used in stead of WGS-84.

R_Ee : 3 x 3 array

rotation matrix defining the axes of the coordinate frame E.

Returns:

n_EB_E: 3 x n array

n-vector(s) [no unit] of position B, decomposed in E.

depth: 1 x n array

Depth(s) [m] of system B, relative to the ellipsoid (depth = -height)

Notes

The position of B (typically body) relative to E (typically Earth) is given into this function as cartesian position vector p_EB_E, in meters. (“ECEF-vector”). The function converts to n-vector, n_EB_E and its depth, depth. The calculation is excact, taking the ellipsity of the Earth into account. It is also non-singular as both n-vector and p-vector are non-singular (except for the center of the Earth). The default ellipsoid model used is WGS-84, but other ellipsoids/spheres might be specified.