Wireless Magnetic Deviation Correction for Urban Navigation
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Solution Overview
Problem
Existing wireless communication systems face challenges in accurately determining magnetic deviation, which is crucial for navigation in urban environments due to the complex and rapidly changing magnetic field disturbances caused by metal structures, making magnetic device readings unreliable for navigation and guidance purposes.
Innovation Solution
A method is introduced where access terminals in wireless communication systems can request and receive magnetic deviation corrections wirelessly, using a repository to store and interpolate magnetic deviation data from nearby positions, allowing for accurate correction of magnetic measurements by including both magnetic declination and deviation.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If magnetic devices are used to determine direction or position, then navigation functionality is provided, but magnetic readings become unreliable in urban environments due to magnetic deviation caused by metal structures
Solution Approach 1:
The patent introduces an intermediary system consisting of a repository and correction server that mediates between the magnetic device and the urban environment. The system collects magnetic deviation data from multiple access terminals, stores it in a repository, and provides correction values to users based on their location, thereby isolating the user from the complex magnetic interference of the urban environment
Solution Approach 2:
The system implements feedback by collecting actual magnetic readings from multiple access terminals in the same area, processing this feedback data to determine average magnetic deviation values, and using these values to correct future readings. This continuous feedback loop allows the system to adapt to changing magnetic conditions in urban environments
2Measurement precision
If magnetic deviation is corrected using data from multiple access terminals, then accuracy of magnetic readings is improved, but system complexity increases due to need for data collection, storage, and processing infrastructure
Solution Approach 1:
The patent makes the correction system universal by implementing it within the existing wireless communication infrastructure. The correction server and repository can serve multiple access terminals simultaneously, and the same infrastructure used for communication can also collect and distribute magnetic deviation data, eliminating the need for dedicated correction hardware at each terminal
Solution Approach 2:
The system enables self-service by allowing access terminals to autonomously request and receive magnetic deviation corrections based on their location. Each terminal independently queries the repository using its determined position and receives the appropriate correction value without requiring manual intervention or complex centralized control
3Measurement precision
If magnetic deviation data is collected and stored in a repository, then correction accuracy is improved, but data management complexity and storage requirements increase
Solution Approach 1:
The patent segments the magnetic deviation data by geographic location, organizing it into location-specific records in the repository. Each record contains corrections for a specific area, allowing the system to retrieve only the relevant data for a user's current location rather than managing and processing all possible deviation data globally
Solution Approach 2:
The system performs preliminary action by pre-collecting and storing magnetic deviation data from multiple access terminals in the repository before users need corrections. This advance data collection allows the correction server to quickly retrieve and apply pre-computed correction values without performing complex real-time calculations when corrections are needed
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 enhances the accuracy of compass applications, enabling better navigation in urban environments by correcting magnetic measurements, and allows for the creation of detailed maps of magnetic disturbances, improving location-based services.
Implementation Method 1
electronic magnetometers are becoming standard equipment in access terminals, performing the function of classic magnetic compasses in navigation
Implementation Method 2
Magnetic deviation, the second correction, is a local disturbance of the Earth's magnetic field caused by metal objects added to the environment by human activity. Each piece of the structure is magnetized and changes the direction of the Earth's local magnetic field
Data Source
AI summary
A method of providing magnetic deviation corresponding to positions in a wireless communication system includes receiving a request wirelessly for a magnetic deviation corresponding to a position of an access terminal, the request including the position of the access terminal; retrieving the magnetic deviation corresponding to the position of the access terminal from a repository; and transmitting wirelessly the magnetic deviation corresponding to the position of the access terminal to the access terminal.