Radar Device Vertical Axis Deviation Estimation
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Solution Overview
Problem
Conventional radar devices face challenges in accurately estimating vertical axis deviation, especially when the radar beam is directed upward, as the reception intensity of the reflected wave from the road surface is insufficient, making it difficult to detect axis deviations.
Innovation Solution
The proposed solution involves an axis deviation estimation device with an object information acquisition unit, a roadside object extraction unit, and an axis deviation angle estimation unit, which acquires and processes information from roadside objects to estimate the vertical axis deviation angle, even when the radar beam is deviated upward, by detecting reflected waves from roadside objects rather than the road surface.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the radar device is mounted in a reference state with the beam directed at the road surface, then the detection of axis deviation is simplified, but the reception intensity of the reflected wave becomes insufficient when the beam is directed upward, making it difficult to detect axis deviations
Solution Approach 1:
The patent introduces roadside objects (guardrails, signs, poles) as intermediary targets for radar wave reflection. Instead of relying on road surface reflection which becomes weak when the beam is directed upward, the system uses these roadside objects as mediators that provide sufficient reflected wave intensity for accurate axis deviation detection even when the radar beam is oriented upward
2Area of stationary object
If the radar beam is directed upward to detect axis deviation, then the detection range is improved, but the reception intensity of the reflected wave from the road surface becomes insufficient
Solution Approach 1:
The patent uses roadside objects as intermediary reflection targets that enable upward-directed radar beams to maintain sufficient reception intensity. These mediators allow the system to expand detection range by directing beams upward while preserving measurement precision through adequate signal strength from the roadside object reflections
3Measurement precision
If roadside objects are used for axis deviation estimation, then accurate detection is achieved even when the radar beam is directed upward, but the device complexity increases due to the need to extract and process roadside object information
Solution Approach 1:
The patent implements self-service by using the radar device's own existing detection capabilities to identify and extract roadside object information from the captured reflection data. The system automatically identifies roadside objects, extracts their positional information, and uses this data for axis deviation estimation without requiring additional specialized sensors or complex external processing systems
Solution Approach 2:
The patent introduces roadside objects as intermediary elements that simplify the measurement process. By using these natural roadside features as reference points, the system achieves accurate vertical axis deviation estimation without requiring complex calibration equipment or additional sensors, thereby managing device complexity while improving measurement precision
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 accurate estimation of vertical axis deviation angles by easily detecting reflected waves from roadside objects, even when they are located away from the radar device, thereby improving the accuracy of axis deviation detection.
Implementation Method 1
a reflection point of a radar wave that is detected by the radar device
Data Source
AI summary
An object information acquisition unit acquires object information including an object distance between a radar device and a reflection object and an object azimuth angle at which the reflection object is located. A roadside object extraction unit extracts roadside object information on a roadside object from the object information. An axis deviation angle estimation unit estimates a vertical axis deviation angle from the roadside object information. The vertical axis deviation angle is an angle of deviation of an actual mounting direction from a reference mounting direction in a vertical direction. The actual mounting direction is an actual direction of the radar device, and the reference mounting direction is a direction of the radar device when the radar device is mounted in a reference state.