System and method for magnetic position tracking

摘要

An improved system for magnetic position tracking of a device includes a magnetic transmitter, a magnetic sensor, a computing system and a polarity inverter. The magnetic transmitter includes at least one transmitter coil that outputs a transmitted magnetic field having a time derivative component. The magnetic sensor includes at least one sensor coil that has coil terminals having a polarity, and the sensor coil is responsive to the time derivative component of the transmitted magnetic field and outputs a sensor signal. The computing system computes position and angular orientation data of a device based on the sensor signal and the polarity inverter is configured to connect to the coil terminals and to cause the polarity of the coil terminals to be reversed according to a switching signal.

主权项

1. A system for magnetic position tracking of a device comprising:
a magnetic transmitter including at least one transmitter coil, wherein said transmitter coil outputs a transmitted magnetic field including a time derivative component; a magnetic sensor including at least one sensor coil, wherein said sensor coil includes coil terminals having a polarity, and wherein said sensor coil is responsive to said time derivative component of said transmitted magnetic field and outputs a sensor signal; a computing system for computing position and angular orientation data of a device based on said sensor signal; and a polarity inverter configured to connect to said coil terminals and to cause the polarity of the coil terminals to be reversed according to a switching signal, wherein magnetic field errors that are caused by connectors and traces that are responsive to said time derivative component of said transmitted magnetic field are substantially removed from the sensor signal.