GPS Navigation Movement Area Masking Positioning Errors
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Solution Overview
Problem
Current location specifying services using GPS signals often result in positioning errors due to geographical features and multipath propagation, leading to inaccurate user location displays, which can cause inconvenience and stress during navigation.
Innovation Solution
An information processing device that sets a destination and acquires positional information using multiple signals, determines a movement area based on the current and destination locations, and controls the display to show or hide the current location within this area, thereby masking errors and providing user-acceptable navigation guidance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If GPS signals are used to specify current location, then positioning service can be provided, but positioning accuracy deteriorates due to multipath propagation and geographical features
Solution Approach 1:
The patent introduces a movement area as an intermediary zone between the measured location and the actual location. This movement area serves as a buffer that accounts for positioning errors, allowing the system to determine whether the measured position falls within an acceptable range rather than treating it as definitively accurate or inaccurate.
Solution Approach 2:
The patent changes the parameter of location representation from a single point to a zone (movement area). By transforming the location data from precise coordinates to a spatial region with boundaries, the system can evaluate whether the position is acceptable based on whether it falls within the predetermined movement area, thus resolving the contradiction between providing positioning service and ensuring positioning accuracy.
2Ease of operation
If current location is displayed based on measured positional information, then navigation guidance is provided, but user stress increases due to erroneous positioning results
Solution Approach 1:
The patent applies beforehand cushioning by pre-establishing a movement area that anticipates and accommodates potential positioning errors. This movement area acts as a cushion that absorbs the impact of inaccurate positioning, allowing the system to display location information confidently knowing that minor errors will not mislead the user significantly.
Solution Approach 2:
The patent converts the harmful effect of positioning errors into a benefit by using the movement area concept. Instead of treating positioning errors as problems to be eliminated, the system embraces them by designing a movement area that explicitly accounts for these errors, thereby transforming the uncertainty into a structured approach that maintains navigation convenience while acknowledging positioning limitations.
3Measurement precision
If movement area is set based on current location and destination, then positioning errors can be masked, but device complexity increases
Solution Approach 1:
The patent segments the navigation problem into distinct functional units: a movement area setting unit that defines the acceptable error zone, a judgment unit that evaluates whether measured positions fall within this zone, and a display control unit that decides what to show based on the judgment. This segmentation allows each unit to perform its specific function independently, managing complexity through modular design.
Solution Approach 2:
The patent applies preliminary action by setting the movement area in advance before actual positioning and navigation occur. This pre-established movement area serves as a reference framework that simplifies subsequent positioning evaluations, as the system only needs to check whether measured positions fall within the pre-defined boundaries rather than performing complex error analysis in real-time.
Data Source
AI summary
In an information processing device, when a positional information acquiring unit acquires positional information calculated from GPS signals and the like, a movement area setting unit sets a movement area with a size corresponding to a distance between a current location and a destination. When the positional information acquiring unit acquires positional information indicating a current location after setting this movement area, a judgment unit judges whether the positional information is within the movement area. Then, as a result of this judgment, in a case of being within the movement area, a display control unit executes display control of a display unit so as to display on a map the positional information, and in a case of being outside of the movement area, so as not to display on the map the positional information.