A satellite navigation system using multiple antennas for providing the position of multiple fiduciary points on an object even when fewer than four satellites are visible to some or all the antennas. The novel rotor assembly comprises a plurality of conductor elements connected in series by superconducting series connections. In particular, the optical connector includes an optical spreader component disposed on a substrate. Passage openings are positioned on each winding surface section relative the winding surface so that a portion of the partition is always between the passage opening and the oppositely disposed winding surface section. Accordingly, the leading-end side of the second contact piece need not be bent to form a curved-surface contacting portion.