Radar Sensor Aiming via Array Antenna Signal Measurement
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Solution Overview
Problem
Conventional radar sensor aiming methods face challenges such as assembly errors due to small radar cover sizes, irregular reflections, and the need for large spaces and electromagnetic wave absorbers, leading to defective inspections and increased costs.
Innovation Solution
A system and method that uses an array antenna to measure radar signal power and detect angular errors, correcting the radar sensor angle by comparing the measured center value with a reference center value, and automatically adjusting the vehicle's position using a centering unit and server to align the radar sensor accurately.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a conventional two-way radar inspection method is used, then the radar sensor can be inspected for signal reflection, but it requires large inspection space, electromagnetic wave absorbers, and causes defective inspection due to irregular reflections
Solution Approach 1:
The patent inverts the conventional two-way radar inspection method by using a one-way transmission method. Instead of transmitting radar signals from the radar sensor and receiving reflected signals, the inspection system transmits electromagnetic waves from an external source through the radar sensor's antenna and measures the transmitted signals directly. This inversion eliminates the need for large inspection spaces and electromagnetic wave absorbers while improving inspection accuracy by avoiding irregular reflections.
2Area of moving object
If the radar cover size is reduced to improve vehicle appearance, then the radar sensor can be mounted with smaller footprint, but assembly errors occur and recognition errors are generated
Solution Approach 1:
The patent implements a feedback mechanism through the one-way radar signal transmission method. The system measures the actual transmitted radar signal characteristics and compares them with expected values to detect assembly errors and recognition errors. This feedback enables real-time detection of mounting inaccuracies, allowing for correction even when the radar cover size is reduced, thereby maintaining manufacturing precision while achieving compact design.
3Area of stationary object
If a one-way radar signal transmission method is used, then the inspection space is reduced and assembly errors are minimized, but the system complexity increases due to additional measurement and correction mechanisms
Solution Approach 1:
The patent extracts the essential function of radar signal transmission from the radar sensor's two-way operation, using only the transmission capability for inspection purposes. By separating the transmission function from the reception and processing functions, the system achieves simplified inspection hardware with reduced inspection space. The extracted transmission signal can be directly measured without requiring complex signal processing chains, thereby reducing overall system complexity while maintaining compact inspection space.
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 reduces recognition errors, minimizes the need for large inspection spaces, and lowers costs by enabling precise radar sensor alignment and reducing the workload in final inspections, while allowing for self-correction of angular errors within specified ranges.
Implementation Method 1
an array antenna configured to measure a propagation intensity of a radar signal transmitted from the radar sensor
Data Source
AI summary
A system for aiming a radar sensor angle which adjusts an angle of the radar sensor mounted on a vehicle entering an inspection line includes: a radar sensor mounted inside a front bumper of the vehicle, a wireless terminal connected to the radar sensor through an in-vehicle communication line and connected to the outside through a repeater, a centering unit for aligning a position of the vehicle by a driving roller based on a reference inspection position of the radar sensor, an array antenna for measuring an intensity of a radar signal transmitted from the radar sensor and detecting a radar center value, and a server detecting an angular error value of the radar sensor by comparing the radar center value with a reference center value of a set mounting specification and transmitting an angular correction value to the radar sensor.