Electromagnetic Navigation Calibration Using Pre-computed Lookup Tables
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Solution Overview
Problem
Electromagnetic navigation systems face challenges in calibration due to sensor or antenna inductances, signal chain delays, and variations in output current levels and receiver channel gains, leading to inconsistencies in sampled electromagnetic signals and requiring laborious mapping generation for each system.
Innovation Solution
A method and system for calibrating electromagnetic navigation systems by computing calibrated in-phase and quadrature components based on received signal magnitude and phase values, using equations to adjust these components, and storing calibrated values for use during navigation procedures, allowing for synchronization and lookup table usage to optimize signal processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If calibration is performed for each electromagnetic navigation system to account for sensor inductances, signal chain delays, and variations in output current levels and receiver channel gains, then measurement precision is improved, but device complexity and time consumption increase due to laborious mapping generation for each system
Solution Approach 1:
The patent applies preliminary action by pre-calculating and storing calibration parameters (magnitude calibration values and phase calibration values) in lookup tables before actual navigation procedures. The system pre-computes calibrated in-phase and quadrature components based on received signal magnitude and phase values, storing these calibrated values for immediate retrieval during navigation, eliminating the need for time-consuming real-time calibration computations.
Solution Approach 2:
The patent uses copying by creating standardized calibration lookup tables that can be replicated across multiple electromagnetic navigation systems. Once calibration parameters are computed for one system, they can be copied and reused in other systems with similar hardware configurations, avoiding redundant calibration work while maintaining measurement precision through consistent calibration approaches.
2Measurement precision
If detailed calibration computations are performed to compute calibrated in-phase and quadrature components based on received signal magnitude and phase values, then measurement precision is improved, but device complexity increases due to multiple computation steps and calibration tables
Solution Approach 1:
The patent reduces computational complexity during navigation by performing all complex calibration computations in advance. The system pre-computes calibrated in-phase components using the formula I_calibrated = I_non-calibrated × cos(θ_calibrated) + Q_non-calibrated × sin(θ_calibrated), and calibrated quadrature components using Q_calibrated = -I_non-calibrated × sin(θ_calibrated) + Q_non-calibrated × cos(θ_calibrated), storing results in lookup tables for immediate retrieval without real-time computation.
Solution Approach 2:
The patent replaces complex real-time mathematical computations with pre-computed lookup tables. Instead of performing intricate calibration calculations during navigation procedures, the system substitutes these computations with simple table lookups based on received signal magnitude and phase values, dramatically reducing computational complexity while maintaining calibration accuracy.
3Manufacturing precision
If mapping generation is performed for each system to account for system-specific variations, then manufacturing precision is improved, but productivity decreases due to laborious and time-consuming processes
Solution Approach 1:
The patent applies universality by creating calibration lookup tables with standardized structures that can be used across multiple electromagnetic navigation systems. The calibration approach using magnitude calibration values and phase calibration values stored in lookup tables is designed to be universally applicable, allowing the same calibration methodology to serve multiple systems with similar hardware configurations, thereby improving productivity while maintaining manufacturing precision.
Solution Approach 2:
The patent improves productivity by performing mapping and calibration generation as preliminary actions during system manufacturing or initialization phases. Once calibration parameters are computed and stored in lookup tables, multiple systems can rapidly deploy using these pre-prepared calibration data structures, eliminating the need for laborious calibration procedures for each individual system deployment.
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 reduces system sensitivity to inconsistencies and allows for the reuse of previously generated mappings across multiple systems, enhancing calibration efficiency and reducing the need for laborious remapping.
Implementation Method 1
receiving, by way of a receiving antenna, a signal having a first magnitude value and a first phase value
Implementation Method 2
transmitting, by way of a transmitting antenna, the signal
Data Source
AI summary
Systems, methods, and computer-readable media for calibrating an electromagnetic navigation system are provided. A signal having a first magnitude value and a first phase value is received by way of a receiving antenna. A non-calibrated in-phase component and a non-calibrated quadrature component are computed based on the first magnitude value and the first phase value. A calibrated phase value is computed based on the non-calibrated in-phase component and the non-calibrated quadrature component, and a calibrated in-phase component is computed based on the calibrated phase value, the non-calibrated in-phase component, and the non-calibrated quadrature component. A calibrated quadrature component is computed based on the calibrated phase value, the non-calibrated in-phase component, and the non-calibrated quadrature component, and a calibrated magnitude value is computed based on the calibrated in-phase component. The calibrated phase value and the calibrated magnitude value are stored in a table for use during an electromagnetic navigation procedure.