Navigation Apparatus Position Correction via Map Matching
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Solution Overview
Problem
Conventional navigation systems, including GPS and inertial navigation, face challenges in providing accurate positioning due to signal obstructions from underground passages, elevated highways, and high-rise buildings, leading to accumulated errors and deviations in navigation routes.
Innovation Solution
A navigation apparatus that senses a carrier's moving status and compares it with characteristic information at specific points on a navigating route, modifying the carrier's position in real-time using azimuth and attitude angle data to correct deviations and provide accurate navigation information.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If GPS is used for navigation, then positioning function is provided, but satellite signal reception is impeded by underground passages, elevated highways, and high-rise buildings
Solution Approach 1:
The patent combines GPS positioning with inertial navigation system (INS) to create a hybrid navigation system. When satellite signals are obstructed, the INS continues to provide positioning information, ensuring continuous and reliable navigation functionality without complete dependence on GPS signals.
Solution Approach 2:
The patent introduces map matching technology as an intermediary to correct INS accumulated errors. By comparing INS-derived position with pre-stored map route information, the system identifies and corrects deviations, maintaining positioning accuracy without requiring continuous satellite signals.
2Reliability
If inertial navigation system is used to continue navigation when GPS signals are obstructed, then navigation function is maintained, but accumulated error causes position deviation from theoretical route
Solution Approach 1:
The patent implements a feedback mechanism where the system continuously compares INS-derived position with map route information. When deviations are detected, the system generates correction signals to adjust the position estimate, preventing accumulated error from causing significant positioning drift.
Solution Approach 2:
The patent performs preliminary actions by pre-storing detailed map route information including road geometries and characteristics before navigation begins. This pre-prepared data serves as a reference framework that enables real-time error correction without requiring complex computations during navigation.
3Measurement precision
If map matching is performed to correct position deviation, then positioning accuracy is improved, but the system assumes carrier cannot deviate from route and only corrects transverse deviation
Solution Approach 1:
The patent transitions from static map matching (assuming fixed route adherence) to dynamic route deviation analysis. The system dynamically determines whether position deviations represent actual route changes or INS errors by analyzing multiple factors including road geometry, carrier movement patterns, and environmental context, enabling accurate correction in both scenarios.
Data Source
AI summary
A method for modifying navigation information is provided in the present invention. The method comprises steps of detecting a status information with respect to a moving carrier guiding by a navigating route; comparing the status information with a characteristic information corresponding to a characteristic point on the navigating route; and finally, determining whether the moving carrier is passing the characteristic point according to the comparing result and modifying the coordinate position of the carrier. In another embodiment, the present invention further provides a navigating apparatus comprising a sensing module for detecting the status of the moving carrier, a signal processing unit, and a storage unit for storing a map information. The signal processing unit comparing the status information to the characteristic information with respect to the characteristic point on the navigating route, and modifying the deviation of the moving carrier to the modify location according to the comparing result.