Magnetic Field Database Corrects Inertial Navigation Accuracy
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Solution Overview
Problem
Inertial navigational systems using electronic compasses suffer from reduced location accuracy due to strong magnetic field variations caused by devices like large screen televisions, magnets, and generators, leading to potential safety issues in critical situations such as emergency responses.
Innovation Solution
A magnetic field database is introduced to correct real-time data from inertial navigational devices by correlating user motion history with dimensional renderings of predefined areas, using magnetic field disturbance maps to adjust location data and improve accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If electronic compasses are used in inertial navigational systems, then location information can be obtained, but location accuracy deteriorates in areas with strong magnetic field variations
Solution Approach 1:
The system performs preliminary magnetic field mapping of the environment before navigation occurs. Magnetic field strength and direction are measured at multiple predetermined locations and stored in a database. This pre-collected magnetic field data is then used to correct location accuracy issues that arise when the electronic compass operates in areas with magnetic field variations, allowing the system to compensate for magnetic interference without requiring real-time remapping.
2Measurement precision
If magnetic field mapping is implemented to correct location data, then location accuracy improves, but device complexity increases
Solution Approach 1:
The system introduces a magnetic field database as an intermediary component that stores pre-measured magnetic field characteristics of the environment. This database acts as a reference that mediates between the electronic compass readings and the actual location, allowing correction of magnetic field errors without adding complex real-time calculation algorithms or additional hardware sensors to the inertial navigational device itself.
3Measurement precision
If real-time magnetic field correction is performed, then location accuracy improves, but processing time increases
Solution Approach 1:
The magnetic field mapping data is collected and stored in advance at multiple predetermined locations in the environment. When the inertial navigational device needs location correction, the system simply queries the pre-stored database using the device's current position estimates, rather than performing real-time magnetic field measurements and calculations. This eliminates time-consuming real-time magnetic field analysis while still providing accurate location correction.
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 solution enhances location accuracy by correcting for magnetic field influences, reducing the risk of fatal errors in crisis management by providing precise user location information even in areas with significant magnetic interference.
Implementation Method 1
magnetic field mapping to correct real-time data generated at the inertial navigational device
Data Source
AI summary
Method and apparatus of increasing location accuracy of an inertial navigational device is described. The inertial navigation device generates real-time data and transmits the real-time data to a second device so that the second device may obtain a location of the inertial navigational device. The inertial navigational device receives an update message from the second device, wherein the update message is created at the second device based on a comparison of the real-time data generated by the inertial navigational device against a magnetic field database and adjusts the depicted location of the inertial navigational device based on the update message in order to increase the location accuracy of the inertial navigational device.