Patent ID: 8779879

Claim:
A system for positioning a part comprising: a first magnetic assembly comprising a plurality of magnetic field devices, said magnetic field devices arranged according to a first code, said first code derived from a source code by replacing each source code element by a product of the source code element and a first symbol, said first symbol having at least two elements, at least one element is nonzero; said source code having an autocorrelation function with a single maximum magnitude and a maximum off maximum peak value less than half of the single maximum magnitude; a second magnetic assembly comprising a second plurality of magnetic field devices, said magnetic field devices arranged according to a second code, said second code derived from said source code by replacing each source code element by a product of the source code element and a second symbol, said second symbol having at least two values, at least one value is nonzero; wherein the first symbol and second symbol have the same length.