Dead Reckoning Navigation for GPS Signal Obstruction
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Solution Overview
Problem
Mobile transceiver devices, such as smartphones, face challenges in determining a physical position when GPS signals are unavailable due to obstructions like buildings and trees, leading to unreliable navigation assistance.
Innovation Solution
The implementation of dead reckoning navigation using inputs from an automobile data system, such as speed sensors and a compass, to estimate a device's position when GPS signals are inadequate, allowing for dynamic switching between GPS and dead reckoning for accurate positional determination.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If GPS signals are used for navigation, then position information can be obtained, but the system becomes unreliable when GPS signals are obstructed by buildings and trees
Solution Approach 1:
The patent introduces dead reckoning as an intermediary navigation method that bridges the gap between GPS availability and navigation requirements. When GPS signals are obstructed, the system switches to dead reckoning using vehicle speed and heading data from the automobile data system, maintaining navigation continuity without requiring direct GPS line-of-sight
Solution Approach 2:
The system dynamically changes the navigation parameter source based on GPS signal availability. By monitoring GPS signal quality and switching between GPS-based position fixing and dead reckoning-based position estimation, the system adapts to varying signal conditions and maintains reliable navigation across different environmental scenarios
2Duration of action of moving object
If dead reckoning navigation is used when GPS is unavailable, then continuous navigation assistance can be provided, but position estimation accuracy decreases compared to GPS
Solution Approach 1:
The patent implements dynamic switching between GPS and dead reckoning navigation modes based on real-time signal availability. The system continuously monitors GPS signal quality and transitions between high-accuracy GPS mode and continuous dead reckoning mode, optimizing both accuracy and continuity according to environmental conditions
Solution Approach 2:
The system prepares dead reckoning navigation outputs in advance by continuously processing vehicle speed and heading data from the automobile data system. This preliminary computation ensures that when GPS signals are lost, position estimation can continue immediately without interruption, maintaining navigation continuity
Data Source
AI summary
A mobile transceiver device comprises a GPS receiver module to receive GPS signals and calculate current positions. The current positions are used in a navigation module. The mobile transceiver device comprises one or more local interface technologies, such as Bluetooth and USB. These local interface technologies can be used to communicate with an automobile data system. In situations where there is sporadic GPS coverage, the mobile transceiver device receives inputs from the automobile data system, such as speed or velocity information, and heading information, such as output from a compass, as available. These inputs are used in the navigation module of the mobile transceiver device to navigate by dead reckoning until an updated position fix based on received GPS signals can be calculated.