Target Device Positioning Using Two Anchor Devices
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Solution Overview
Problem
Conventional positioning methods require three or more anchor devices for accurate location determination in 3D space, which is challenging due to the difficulty in finding suitable anchor devices and is prone to errors from multipath signal transmission and reflection.
Innovation Solution
A method using two anchor devices to measure distances and angles, allowing the target device to determine its location based on these measurements, reducing the need for multiple anchor devices and minimizing errors from signal interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If three or more anchor devices are used for positioning, then positioning accuracy is improved, but device complexity and difficulty of finding suitable anchor devices increases
Solution Approach 1:
The patent introduces the target device's movement trajectory as an intermediary element. By having the target device move to multiple locations and measure distances at each location, the system converts a multi-anchor problem into a multi-position measurement problem. The trajectory information serves as additional geometric constraints that enable accurate positioning with fewer anchors.
Solution Approach 2:
The patent transitions from static positioning measurements to dynamic trajectory-based measurements. By adding the temporal dimension of movement and utilizing the trajectory path as an additional dimension of information, the system can determine position with fewer anchor devices. The movement trajectory provides extra geometric relationships that compensate for the reduced number of anchors.
2Reliability
If conventional positioning methods are used, then positioning can be achieved, but errors from multipath signal transmission and reflection occur
Solution Approach 1:
The patent replaces wave-based signal transmission measurements with geometry-based trajectory analysis. Instead of relying on signal propagation that is susceptible to multipath effects, the system uses the target device's movement trajectory and distance measurements to geometrically determine position. This substitution eliminates the harmful multipath signal errors by avoiding wave transmission dependencies.
3Adaptability or versatility
If multiple anchor devices are deployed, then positioning coverage is improved, but ease of operation and anchor device placement complexity increases
Solution Approach 1:
The patent extracts the positioning problem from the anchor device framework and reformulates it as a trajectory-based measurement problem. By removing the requirement for multiple anchor devices and instead utilizing the target device's own movement trajectory, the system simplifies deployment while maintaining positioning coverage. The anchor devices become reference points rather than the core positioning mechanism.
Data Source
AI summary
Embodiments of the present disclosure relate to positioning target device. According to embodiments of the present disclosure, the location of the target device is measured by two anchor devices. The distances between the target device at a location and the anchor devices are measured and the distances between the target device at a further location and the anchor devices are also measured. The location of the target device is estimated based on the distances. In this way, fewer anchor devices are used to perform the positioning.