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 transmitter configured to transmit a magnetic field having a time derivative component; a sensor including terminals having a polarity, wherein the sensor is responsive to the time derivative component of the transmitted magnetic field and outputs a sensor signal; a computing system for computing data representative of one or both of position and angular orientation of a device based on the sensor signal; and a polarity inverter configured to cause the polarity of the terminals to be reversed according to a switching signal, wherein magnetic field errors that are caused by conductors that are responsive to the time derivative component of the transmitted magnetic field are substantially removed from the sensor signal.