2015 Volume 39 Issue 4 Pages 156-160
A new tracking system for a wireless magnetic ribbon type marker has been developed by using high-speed analog-to-digital [A/D] converters and a field programmable gate array (FPGA) module. The quality factor of the resonated marker (ribbon: 38 mm in length and 4 mm in width) was about 130. The standard deviation (position accuracy) was smaller than ～1/10 that of the previous system because the sampling frequency of the A/D converters was more than 100 times higher and because the FPGA operated at high speed. The distance between the driving coil and the pickup coil array was ～820 mm, which was ～2.7 times larger than that in the previously reported system. The profile of the marker we obtained was relatively smooth and reasonable up to a distance of 475 mm from the pickup coil array.
