Navigation System Overlapping Map Data Loading
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Solution Overview
Problem
Conventional navigation systems face issues when a vehicle moves into areas not initially transferred to the hard disk, leading to sudden map data unavailability and navigation system failure due to the need for simultaneous loading of multiple block map data at boundaries.
Innovation Solution
A navigation system configuration that includes a reading unit for partially overlapping maps, a storage unit for identifying overlapping areas, and a control unit to manage map data loading based on current coordinates, allowing seamless transitions between overlapping map sections, with the option to use a portable memory card for convenient data access.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Area of stationary object
If multiple block map data are loaded simultaneously at boundaries, then navigation coverage is improved, but system reliability deteriorates due to sudden map data unavailability
Solution Approach 1:
The patent applies preliminary action by loading map data from overlapping areas in advance before the vehicle actually reaches those areas. The control unit determines that map data in overlapping areas should be loaded beforehand, ensuring continuous navigation capability without sudden data unavailability when the vehicle crosses block boundaries.
Solution Approach 2:
The overlapping map data areas act as a cushion or buffer zone. When the vehicle approaches a block boundary, the overlapping data provides a buffer that prevents sudden navigation failure, ensuring smooth transition between map blocks without interruption.
2Speed
If map data is transferred from DVD to hard disk, then navigation speed is improved, but device complexity increases due to multiple storage media management
Solution Approach 1:
The patent segments map data into block units that can be independently managed and transferred. Each block map data is treated as a separate unit that can be loaded, stored, and managed independently, simplifying the overall data management process despite using multiple storage media.
Solution Approach 2:
The hard disk acts as an intermediary storage medium between the DVD and the navigation processing system. Map data is first transferred from DVD to hard disk, and then loaded as needed, providing a buffer that simplifies data management and improves access speed.
3Ease of operation
If DVD ejection is allowed during navigation, then ease of operation is improved, but reliability deteriorates due to potential navigation interruption
Solution Approach 1:
The system performs preliminary loading of map data from overlapping areas before the DVD is ejected. This ensures that sufficient map data is already available in the hard disk to maintain navigation continuity even after DVD ejection, allowing users to eject DVDs during navigation without interruption.
Data Source
AI summary
A navigation system comprises: a GPS for detecting a current position; a DVD drive for reading a map from a DVD on which a plurality of partially overlapping maps are recorded; a Memory card for storing information to identify a portion overlapping with another map, in a map being used for navigation; and a CPU for judging, based on coordinates of a current position and the information stored in the Memory card, whether the coordinates of the current position are contained in the overlapping portion or not, and for controlling, in response to a judgment that the coordinates of the current position are contained in the overlapping portion, the DVD drive to read from the DVD the map sharing the overlapping portion. Consequently, map data to be loaded can be smoothly changed according to the current position.