Vehicle Positioning Switching Between Ground and Satellite Corrections
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Current positioning systems face challenges in achieving high precision and real-time accuracy, particularly during sudden ionospheric storms, due to limitations in data transmission time and accuracy when using either ground or satellite channels for positioning reinforcement information.
Innovation Solution
A positioning apparatus that selectively uses either ground-based or satellite-based positioning reinforcement information, depending on the automatic driving mode, to calculate and output a final own position. This apparatus includes units for receiving satellite positioning information, ground and satellite reinforcement information, and determining the appropriate position calculation based on driving mode signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If positioning reinforcement information is acquired by satellite channel, then coverage area is expanded, but transmission time increases and real-time property deteriorates
Solution Approach 1:
The system dynamically switches between satellite channel and ground channel based on driving mode. In automatic driving mode, satellite channel is used for wide coverage despite longer transmission time. In manual driving mode, ground channel is used for faster real-time correction. This dynamic adaptation resolves the contradiction between coverage area and transmission time.
2Loss of time
If positioning reinforcement information is acquired by ground channel, then real-time property is improved, but coverage area is limited
Solution Approach 1:
The positioning system incorporates multiple information acquisition channels (satellite channel and ground channel) that can be selectively used based on requirements. The satellite channel provides wide coverage, while the ground channel provides fast real-time correction. This multi-functional approach allows the system to overcome the limitation of single-channel coverage area.
3Area of stationary object
If satellite channel is used for positioning reinforcement, then positioning coverage is expanded, but positioning accuracy may deteriorate due to data compression
Solution Approach 1:
The ground base station acts as an intermediary that receives uncompressed positioning reinforcement information from reference points and transmits it to the receiver via ground channel. This intermediary approach allows the system to maintain high positioning accuracy while still providing wide coverage through satellite positioning information.
4Area of stationary object
If positioning reinforcement information is transmitted from multiple reference points via satellite, then coverage area increases, but data amount increases and transmission time increases
Solution Approach 1:
The system extracts only the necessary positioning reinforcement information from multiple reference points via satellite channel, then supplements it with ground channel information. This selective extraction approach reduces the overall data amount and transmission time while maintaining wide coverage capability.
Data Source
AI summary
To provide a positioning apparatus which can reduce the error of the positioning information of the positioning satellite, by using either appropriate one of the positioning reinforcement information by the ground channel or the positioning reinforcement information by the satellite channel, according to execution state of the automatic driving. A positioning apparatus receives positioning information from positioning satellites; calculates a first own position based on the positioning information and the positioning reinforcement information of the ground base station; calculates a second own position based on the positioning information and the positioning reinforcement information of the satellite; determines either the first own position or the second own position to be used, based on whether or not the driving mode is the automatic driving mode; and outputs the first own position or the second own position determined to be used, as a final own position.