Automatic Frequency Selection for Magnetic Tracking Jitter
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Solution Overview
Problem
Magnetic tracking systems face accuracy issues due to unintentional electromagnetic sources causing jitter, which is not effectively addressed by existing technologies.
Innovation Solution
A system and method that automatically selects a frequency set for the magnetic field by comparing expected and actual jitter levels, switching to a different frequency set when the ratio exceeds a predetermined threshold, to minimize interference from extraneous energy sources.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a fixed frequency is used for magnetic field generation, then the system operation is simple, but the accuracy deteriorates due to interference from unintentional electromagnetic sources
Solution Approach 1:
The system dynamically switches between multiple frequency sets based on real-time jitter detection. The processor monitors position stability and automatically transitions to alternative frequencies when interference is detected, making the frequency selection adaptive rather than static.
Solution Approach 2:
The system changes the operating frequency parameter to avoid interference. By having multiple pre-defined frequency sets and switching between them based on environmental conditions, the system maintains accurate tracking despite the presence of unintentional electromagnetic sources.
2Reliability
If multiple frequency sets are available for selection, then the accuracy improves by avoiding interference, but the device complexity increases due to frequency management
Solution Approach 1:
The system performs self-diagnosis by monitoring its own position data for jitter patterns. When instability is detected, the processor automatically initiates frequency switching without external intervention, enabling the system to self-correct interference issues.
Solution Approach 2:
The system uses feedback from position measurement stability to control frequency selection. The processor continuously monitors tracking accuracy and uses this feedback to determine when to switch frequency sets, creating a closed-loop control system that maintains reliability.
3Measurement precision
If automatic frequency switching is implemented, then the jitter is reduced, but the processing complexity increases
Solution Approach 1:
The system applies a simplified jitter detection algorithm that monitors only the essential position stability metric rather than analyzing all tracking parameters. This partial monitoring approach reduces processing complexity while still effectively detecting interference conditions that require frequency switching.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach significantly reduces jitter and improves the accuracy of position and orientation determination in magnetic tracking systems by dynamically selecting the least interfering frequency set, enhancing operational stability and user experience.
Implementation Method 1
a transmitter comprising a plurality of source magnetic coils configured to generate a magnetic field
Implementation Method 2
a receiver comprising a plurality of sensor magnetic coils configured to sense the magnetic field and generate magnetic sensor data
Data Source
AI summary
A system and method that can automatically select a frequency of a magnetic field in a magnetic tracking system. A magnetic tracking system emits an alternating magnetic field using a set of three frequencies. In the present approach, a transmitter is capable of generating multiple sets of three frequencies. A processor selects a first set of frequencies to use and causes the receiver to measure the amplitude of the magnetic field at those frequencies. In one embodiment, the frequency set having the lowest energy is selected. The processor then compares an estimated jitter at those frequencies to the actual jitter experienced using the frequencies. If the actual jitter exceeds the estimated jitter by a predetermined amount, the processor switches to a different set of frequencies and causes the receiver to measure the magnetic field at the new set of frequencies. The process may repeat using the additional sets of frequencies.