Positioning Device Autonomous Navigation Start Point Data
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Solution Overview
Problem
Positioning devices with autonomous navigation functions face challenges in calculating position data during movement when the starting point position data is not obtained, limiting their ability to determine past movement points both in real-time and retrospectively.
Innovation Solution
A positioning device and method that utilize a movement measuring unit to continuously measure relative positional changes, allowing for the calculation of position data at any point on a moving route excluding the start point, using a combination of autonomous navigation and GPS data to correct and determine past positions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If autonomous navigation function is used to calculate position data during movement, then position data can be obtained without GPS, but it becomes impossible to calculate position data if starting point position data is not obtained
Solution Approach 1:
The system performs preliminary autonomous navigation calculations to obtain temporary position data during movement, storing this data temporarily. Later, when reference position data becomes available, the system retrospectively calculates the offset between temporary and reference positions, and applies this offset to correct all previously calculated position data. This preliminary action allows the system to maintain position calculation capability even when starting point data is initially unavailable.
2Speed
If position data is calculated using autonomous navigation sensors, then real-time position data can be obtained, but measurement errors of the sensors accumulate over time
Solution Approach 1:
The system obtains reference position data from GPS or other positioning devices at specific points during movement. It then calculates the offset between the autonomous navigation position data and the reference position data, and uses this offset as feedback to correct the autonomous navigation position data. This feedback mechanism eliminates cumulative measurement errors while preserving real-time position tracking capability.
3Loss of information
If position data of each point is stored for retrospective analysis, then past movement points can be checked, but storage requirements increase
Solution Approach 1:
Instead of storing only final corrected position data, the system creates and stores temporary position data during autonomous navigation movement. These temporary position data represent the movement trajectory and can be retrospectively corrected using reference position data obtained later. This copying approach enables retrospective analysis while managing storage requirements by storing intermediate calculation results rather than multiple versions of final data.
Data Source
AI summary
A positioning device including a movement measuring unit for measuring a relative positional change and a passing position calculation control unit for continuing measurement of the positional change of the movement measuring unit during movement, being given position data of any first point at the first point on a moving route excluding a start point, and determining position data of a point which has been passed before arrival at the first point on the basis of the given position data of the first point and data of the positional change continuously measured by the movement measuring unit.