Hybrid Navigation Track Correction via GPS Feedback
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Solution Overview
Problem
Existing self-contained navigation techniques suffer from inaccuracies due to errors in reference directions and positions, leading to cumulative errors over time, making it difficult to correct estimated vehicle positions and directions accurately.
Innovation Solution
A device and method that combines self-contained navigation data with GPS information to correct navigation tracks by comparing the self-contained navigation track with a GPS track, using a smaller correction amount to achieve higher accuracy and reduce erroneous corrections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If self-contained navigation is used to track vehicle position and direction, then the navigation system operates independently without external signals, but cumulative errors increase over time causing inaccurate position and direction estimation
Solution Approach 1:
The patent combines self-contained navigation (inertial sensors) with GPS navigation to create a hybrid system. The self-contained navigation provides continuous tracking independent of external signals, while GPS provides periodic absolute position references to correct cumulative errors, achieving both independence and accuracy
Solution Approach 2:
The system uses GPS position information as feedback to detect and correct cumulative errors in the self-contained navigation system. By comparing the self-contained navigation track with the GPS track, the system identifies deviations and applies corrections to maintain accuracy over time
2Measurement precision
If correction is applied to align self-contained navigation track with GPS track, then position accuracy improves, but erroneous corrections may occur when GPS data itself contains errors
Solution Approach 1:
The patent applies partial correction by using a correction coefficient (alpha) between 0 and 1 to blend the self-contained navigation position with the GPS position. This partial action allows the system to benefit from GPS correction while maintaining the stability of self-contained navigation and reducing the impact of potential GPS errors
Solution Approach 2:
The system dynamically adjusts the correction coefficient (alpha) based on the reliability of GPS signals and the characteristics of the self-contained navigation system. This parameter change allows optimal balancing between using GPS corrections and maintaining self-contained navigation accuracy under different conditions
Data Source
AI summary
Track information generating devices, methods, and programs acquire a self-contained navigation track of a vehicle indicated by time-series pieces of self-contained navigation information, and acquire a GPS track that is a track of the vehicle indicated by time-series pieces of GPS information. The devices, methods, and compare the self-contained navigation track with the GPS track to acquire a first correction amount for obtaining the highest degree of coincidence between the self-contained navigation track and the GPS track and then correct the self-contained navigation information using a second correction amount that is smaller than the first correction amount.