Hi mreda,
If I understand correctly, you're trying to find your location based off other reference-points with known locations. This is the way GPS technology works. Using the known location of three or more satellites and your distance from them, you can calculate your own location with a linear system of equations.
I have a
patent on a similar, reference-point-based, 3D location algorithm. Feel free to PM me if this is helpful and you have any more questions.