A guidance system includes a first laser device coupled to a mount, the first
laser
device adapted to generate a first laser signal having a first wavelength. A second
laser device is also coupled to the mount and directed substantially parallel with
the first laser device. The second laser device is adapted to generate a second
laser signal having a second wavelength. A first photodiode is adapted to detect
the first laser signal, retro-reflected from a first wavelength matched section
of a reflector system, and the second laser, signal retro-reflected from a second
wavelength matched section of the reflector system. The first photodiode is adapted
to generate a first photodiode signal therefrom.
