Inertial Navigation Reference Position Correction
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Solution Overview
Problem
Inertial navigation systems face challenges in determining an accurate starting position, especially when satellite navigation systems fail due to operational failures or atmospheric disturbances, leading to incorrect positioning.
Innovation Solution
The method involves detecting environmental conditions around a vehicle and associating them with known reference positions, which are used to correct the starting position, allowing the system to operate independently of satellite navigation and improve positioning accuracy by using probability-based storage of frequently visited locations and averaging to filter out errors.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If satellite navigation systems are used to determine absolute position, then positioning accuracy is improved, but the system becomes vulnerable to atmospheric disturbances and operational failures
Solution Approach 1:
The patent introduces environmental conditions (landmarks, recognizable features) as intermediary reference points that mediate between the vehicle and the satellite navigation system. These environmental references serve as backup positioning mechanisms that can compensate for satellite failures or atmospheric disturbances, thereby improving system reliability while maintaining positioning accuracy through multiple reference sources
Solution Approach 2:
The patent changes the reference parameter from solely satellite-based geometric positioning to a hybrid system that incorporates environmental condition parameters. By detecting and associating environmental conditions with position data, the system can switch between satellite-based positioning and environment-based positioning, adjusting the positioning method based on signal availability and reliability
2Adaptability or versatility
If inertial navigation system operates without satellite signals, then system independence is improved, but positioning accuracy deteriorates due to incorrect starting positions
Solution Approach 1:
The patent applies preliminary action by pre-establishing reference positions associated with detectable environmental conditions before the actual navigation operation. The system detects environmental conditions, determines positions, and stores these as reference data in advance. When navigation begins, these pre-stored references provide accurate starting positions and ongoing position corrections, enabling the inertial navigation system to operate independently while maintaining accuracy
Solution Approach 2:
The system implements feedback by continuously detecting environmental conditions and comparing them with stored reference positions. When the vehicle passes recognizable environmental features again, the system uses this feedback to correct accumulated drift in the inertial navigation system, maintaining positioning accuracy without requiring constant satellite signals
3Loss of information
If multiple sensor sizes are used to increase information, then information content is improved, but device complexity increases
Solution Approach 1:
The patent applies universality by making the environmental condition detection system multi-functional. The same detection mechanism used for initial position determination is also employed for ongoing position corrections and navigation throughout the operation. This multi-functional approach increases information content without proportionally increasing complexity, as the system uses a single detection framework for multiple purposes
Data Source
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AI summary
The invention relates to a method for determining a reference position (46) as the basis for a starting position (40) for an inertial navigation system (36) which is designed to determine the location of a vehicle (2) on the basis of the starting position (40) and a change (16) in the relative position of said vehicle (2), said method including the steps of: - detecting an ambient condition (52) around the vehicle (2), - determining a position (34, 18) of the vehicle (2) at the location of the detected ambient condition (52), and - assigning the determined position (34, 18) to the detected ambient condition (52) as a reference position (46).