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Method and system for fast tracking of rotating magnetic field based on four-point measurement

A technology of rotating magnetic field and tracking system, applied in the field of electromagnetic tracking, can solve problems such as affecting system performance

Active Publication Date: 2017-11-10
FUDAN UNIV
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Problems solved by technology

[0004] However, for the above-mentioned electromagnetic tracking system based on the rotating magnetic field, how to quickly and accurately point the maximum magnetic induction intensity generated by the magnetic field source to the sensor will directly affect the performance of the entire system

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  • Method and system for fast tracking of rotating magnetic field based on four-point measurement
  • Method and system for fast tracking of rotating magnetic field based on four-point measurement

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Embodiment Construction

[0042] Attached below Figure 4~7 The present invention is further described.

[0043] Figure 4 It is the composition of an electromagnetic tracking system applicable to the fast tracking method of the rotating magnetic field based on four-point measurement in the present invention, including a magnetic field source unit 10 , a magnetic sensor unit 20 and a control processing unit 30 . Wherein the control processing unit 30 controls the magnetic field source 10 to scan and search in the range of 180 °; the magnetic field source 10 rotates every 45 °, and the magnetic sensor 20 collects the magnetic induction data once, and stores the data in the control processing unit 30; the control processing unit 30 passes through The rotation angle corresponding to the maximum value of the magnetic induction intensity data is determined by the fast tracking method of the rotating magnetic field based on the four-point measurement.

[0044] Figure 5 is a detailed block diagram of the ...

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Abstract

The invention belongs to the technical field of electromagnetic tracking and particularly relates to a rotary magnetic field rapid tracking method and system based on four-point measurement. The method comprises the following steps: firstly, when rotating a magnetic field source in a 180-degree rotary searching range of any plane for 45 degrees, acquiring a magnetic induction intensity value by a three-axis magnetic sensor and totally acquiring four values; then, dividing the four sampling values into two groups located on the two sides of a maximum value of magnetic induction intensity according to a certain rule; then connecting data at two points of each group to form a straight line, and calculating the slopes of the two straight lines; and finally, revising the two straight lines according to a certain rule so that a rotary angle corresponding to the crossed point of the two straight lines is consistent to a rotary angle corresponding to the maximum value of the magnetic induction intensity. The invention further provides an electromagnetic tracking system for realizing the rotary magnetic field rapid tracking system based on the four-point measurement. With the adoption of the rotary magnetic field rapid tracking method and system based on the four-point measurement, the accuracy and speed of pointing a rotary magnetic field to the magnetic sensor can be improved, so that the performance of the electromagnetic tracking system is improved.

Description

technical field [0001] The invention belongs to the technical field of electromagnetic tracking, and in particular relates to an optimization method for measuring the maximum rotation angle of magnetic induction intensity of an electromagnetic tracking system and a system thereof. Background technique [0002] Electromagnetic Tracking (Electromagnetic Tracking), or electromagnetic field positioning, is a method of detecting and real-time tracking the spatial position and attitude of the tracking target using electromagnetic fields. This method can be applied to the navigation of minimally invasive surgery, and can also be applied to fields such as virtual (augmented) reality and three-dimensional ultrasound imaging. The electromagnetic tracking system generally consists of three parts: a magnetic field source (such as a permanent magnet, an electromagnet coil), a magnetic field sensor, and a control processing unit. The magnetic field source generates a magnetic field at a ...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): G01C21/00G01V3/00
CPCG01C21/00G01V3/00
Inventor 邬小玫王一枫盛昶宋彪
Owner FUDAN UNIV
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