Magnetic Navigation Mode Switching for GNSS-Denied Localization
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Solution Overview
Problem
Global Navigation Satellite Systems (GNSS) face reliability issues in environments with signal interference or malicious attacks, and existing geomagnetic field maps lack sufficient resolution for precise localization and navigation, especially in urban areas.
Innovation Solution
Magnetic navigation systems utilize geomagnetic measurements from devices to create and continuously update high-resolution geomagnetic maps, combining with GNSS and inertial data to enhance navigation reliability, especially in environments where GNSS is unreliable.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If geomagnetic field maps are used for navigation, then reliability in GNSS-denied environments is improved, but measurement precision is insufficient for precise localization
Solution Approach 1:
The patent combines multiple magnetic field maps from different sources and time periods into a single composite magnetic field map. This merging process integrates data from various magnetic navigation devices and updates the map continuously, thereby improving both the reliability and measurement precision of localization in GNSS-denied environments.
Solution Approach 2:
The magnetic field map is continuously updated with new magnetic field measurements as devices traverse different areas. This continuous update process ensures the map remains current and accurate, improving measurement precision over time while maintaining reliability across changing environmental conditions.
2Measurement precision
If magnetic navigation systems continuously update geomagnetic maps, then measurement precision is improved, but use of energy increases
Solution Approach 1:
The system performs magnetic field measurements and map updates at periodic intervals rather than continuously. Magnetic field maps are updated based on trigger events such as device traversal of new areas or accumulation of sufficient measurement data, reducing energy consumption while maintaining measurement precision.
Solution Approach 2:
The magnetic navigation device utilizes its own magnetic field measurements to contribute to the collective magnetic field map. Each device serves itself and the community by providing measurements that improve the overall map accuracy, distributing the computational and energy burden across multiple devices rather than requiring centralized continuous updating.
3Measurement precision
If multiple magnetic field measurements are collected from different devices, then measurement precision is improved, but device complexity increases
Solution Approach 1:
The patent introduces a magnetic field map server as an intermediary that receives, processes, and stores magnetic field measurements from multiple devices. This centralized intermediary simplifies the complexity by handling data aggregation and map generation remotely, allowing individual devices to remain relatively simple while still contributing to and benefiting from high-resolution collective data.
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
Provides reliable localization and navigation by leveraging high-resolution geomagnetic maps, improving accuracy and reliability in environments where GNSS is compromised.
Implementation Method 1
a magnetometer 156 to make magnetic field measurements
Data Source
Figure 1A
Figure 1B
Figure 2
AI summary
In one embodiment, a method includes collecting, by a magnetic navigation device, magnetic measurements of a particular geographical region in accordance with a position and trajectory of the magnetic navigation device; accessing a global navigation satellite system (GNSS) signal status and a network connection status on the magnetic navigation device; determining an operational mode for the magnetic navigation device based on the GNSS signal status and the network connection status; determining whether to transmit the magnetic measurements to a server or store the magnetic measurements locally on the magnetic navigation device based on the operational mode; and performing navigation or localization operations using the operational mode.