Inductive angular position sensing over 360-degree target measurement range using 180-degree sensor area

An apparatus comprising:

• a target, the target including a target body to rotate about an axis, the target body having a generally planar annular shape, the target body comprising:
• an outer annulus region including a first outer half annulus region and a second outer half annulus region, at least a substantial portion of the first outer half annulus region comprising conductive material, the second outer half annulus region comprising non-conductive material;
• and
• an inner annulus region including a first inner half annulus region and a second inner half annulus region, the first inner half annulus region adjacent the first outer half annulus region, the second inner half annulus region adjacent the second outer half annulus region, at least a substantial portion of the second inner half annulus region comprising conductive material, the first inner half annulus region comprising non-conductive material.

An apparatus comprising:

• a support structure;
• and
• a set of coils on, or in, the support structure, the set of coils arranged at least generally in a half annulus centered about an axis, the set of coils comprising:
• one or more oscillator coils having a coil winding pattern arranged at least generally along or within boundaries of the half annulus;
• a first sense coil including a first continuous path defining a number of first lobes, respective lobes of the number of first lobes substantially proportionally arranged in the half annulus;
• and
• a second sense coil including a second continuous path defining a number of second lobes, the number of second lobes greater than the number of first lobes, respective lobes of the number of second lobes substantially proportionally arranged in the half annulus.