Axial Misalignment Estimation for Radar Beam Alignment
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Solution Overview
Problem
Conventional radar devices struggle to accurately estimate axial misalignment angles in both horizontal and vertical directions, leading to detection errors due to the inability to simultaneously estimate these angles effectively.
Innovation Solution
An axial-misalignment estimating device that acquires reflection point information, converts it into three-dimensional coordinates, extracts stationary reflection points, and estimates unknown parameters, including a traveling direction vector, to determine axial misalignment angles in both horizontal and vertical directions using a relational expression and simultaneous equations.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If separate devices are prepared for horizontal and vertical axial misalignment estimation, then each direction can be estimated individually, but the overall estimation accuracy deteriorates due to lack of simultaneous estimation
Solution Approach 1:
The patent merges the horizontal and vertical axial misalignment estimation functions into a single integrated device. The estimation unit simultaneously processes reflection point information from both horizontal and vertical angles to estimate both axial misalignment angles at the same time, eliminating the need for separate devices while improving overall estimation accuracy through coordinated processing.
Solution Approach 2:
The axial misalignment estimation device is designed with multi-functionality to handle both horizontal and vertical direction estimations. The estimation unit can process reflection point information across different angle ranges and estimate multiple types of axial misalignment angles using the same hardware platform, making the device universal rather than specialized for a single direction.
2Measurement precision
If conventional methods are used for horizontal axial misalignment estimation, then horizontal misalignment can be detected, but vertical axial misalignment estimation capability is lost
Solution Approach 1:
The patent extends the estimation capability from a single horizontal dimension to multiple dimensions by incorporating vertical angle information. The estimation unit processes reflection point information that includes both horizontal angles and vertical angles, enabling simultaneous estimation of axial misalignment angles in both horizontal and vertical directions through multi-dimensional data processing.
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 allows for simultaneous and accurate estimation of axial misalignment angles in both directions, improving detection accuracy and enabling correction of radar beam alignment.
Implementation Method 1
a radar device mounted to a moving body, estimates an axial misalignment angle... reflection point information including a horizontal angle and a vertical angle determined relative to a beam direction... and a relative speed of a reflection point
Data Source
AI summary
An acquiring unit acquires, for each of reflection points detected by a radar device, reflection point information including a horizontal angle, a vertical angle, and a relative speed. A converting unit converts each of the reflection points into three-dimensional coordinates. An extracting unit extracts stationary reflection points from the reflection points. An estimating unit uses a relational expression established among unknown parameters including a traveling direction vector and a moving speed of a moving body, three-dimensional coordinates of each of the stationary reflection points, and a relative speed of the stationary reflection point, to estimate the known parameters. A calculating unit determines an axial misalignment angle from the estimated unknown parameters.