Dynamic Antenna Positioning for GNSS Multipath Mitigation
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Solution Overview
Problem
Satellite positioning by GNSS is affected by radio wave shielding and multipaths, leading to errors in positioning results due to obstacles like buildings, which conventional methods fail to adequately address.
Innovation Solution
A positioning device with an antenna that can change its position to optimize radio wave reception, using a motorized arm system to adjust the antenna's position based on detected multipath interference and shielding, ensuring accurate positioning by determining the optimal antenna position for improved signal quality.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the antenna position is fixed, then the device complexity is low, but the positioning accuracy deteriorates due to shielding and multipath effects
Solution Approach 1:
The antenna position is made dynamic through a motor-driven adjustment mechanism that can change the antenna's position in three-dimensional space. The control unit dynamically adjusts the antenna position based on positioning accuracy feedback, transforming the static antenna system into a dynamic one that adapts to shielding and multipath conditions to maintain high positioning accuracy.
Solution Approach 2:
A feedback control mechanism is implemented where the positioning unit provides feedback on positioning accuracy to the control unit. The control unit uses this feedback information to determine optimal antenna positions and adjust the antenna accordingly, creating a closed-loop system that continuously improves positioning accuracy by learning from previous positioning results.
2Reliability
If the antenna position is adjusted to avoid shielding, then the positioning accuracy improves, but the device complexity increases due to additional control mechanisms
Solution Approach 1:
The system employs a motor-driven antenna position adjustment mechanism that can dynamically change the antenna's three-dimensional position. This dynamic capability allows the antenna to move to optimal positions that avoid shielding and multipath effects, thereby improving positioning stability and reliability.
Solution Approach 2:
The control unit autonomously determines optimal antenna positions by processing positioning accuracy feedback without requiring external manual intervention. The system self-adjusts the antenna position based on the positioning results, enabling the system to serve itself in optimizing its own performance and maintaining stable positioning.
3Measurement precision
If multiple antenna positions are tested, then the positioning accuracy improves, but the time consumption increases
Solution Approach 1:
The system performs preliminary actions by pre-determining multiple candidate antenna positions based on predicted shielding and multipath conditions before actual positioning occurs. The control unit can prepare position adjustment plans in advance, allowing the antenna to be positioned optimally without requiring extensive real-time testing, thus reducing time consumption while maintaining high positioning accuracy.
Solution Approach 2:
The control unit continuously monitors positioning accuracy and maintains the antenna at optimal positions without requiring repeated testing. Once an optimal position is found, the system maintains this position continuously, eliminating the need for repeated time-consuming position testing while ensuring sustained high positioning accuracy throughout operation.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
This approach stabilizes satellite positioning by reducing the impact of radio wave shielding and multipaths, achieving accurate positioning even in environments with obstacles, by dynamically adjusting the antenna's position to maximize signal reception.
Implementation Method 1
an antenna (11) that is mounted on the mobile object (3) and receives radio waves from a satellite (4)
Data Source
AI summary
A positioning device (1) according to the present invention includes an antenna (11) that is mounted on a mobile object (3) and receives radio waves from a satellite, a positioning unit (12) that calculates a positioning result and positioning accuracy on the basis of radio waves received by the antenna (11), an antenna position changing unit (13) that changes a position of the antenna (11), an antenna position detection unit (14) that detects a relative position of the antenna (11) with respect to the mobile object (3) after changing the position of the antenna (11), and a control unit (15) that controls the position of the antenna (11) and determines a position of the mobile object (3) on the basis of the positioning result and the relative position in a case where the positioning accuracy is equal to or more than a threshold.