Vehicle Object Detection Angle Correction for Bumper Phase Distortion
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Solution Overview
Problem
Existing vehicle control systems face challenges in accurately calculating angles between vehicles and objects due to phase distortion caused by vehicle bumpers, which is difficult and costly to measure individually for each vehicle, leading to reduced efficiency and accuracy.
Innovation Solution
A vehicle control system that generates and corrects phase curves using the ratio of relative speed between the vehicle and detected objects, compensating for phase distortion caused by bumpers to enhance angle calculation accuracy.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If a sensor is mounted on the rear side portion of the vehicle to calculate angle using phase mono-pulse algorithm, then angular ambiguity is minimized compared to beamforming scheme, but phase distortion occurs due to diffuse reflection in the bumper
Solution Approach 1:
The patent changes the parameter of phase curve by generating a new phase curve that reflects the specific phase distortion characteristics of each vehicle's bumper. This is achieved by measuring the phase difference between signals received by multiple antennas and calculating the corresponding phase curve, then using this vehicle-specific phase curve to correct angle calculations, thereby compensating for the phase distortion caused by bumper reflection.
2Measurement precision
If the optimal sensor mounting location is determined by measuring the phase curve individually for each vehicle, then phase distortion is minimized, but time and cost consumption increases
Solution Approach 1:
The system performs self-characterization by automatically measuring and storing the phase curve specific to each vehicle during or after manufacturing. This self-service approach allows the vehicle to independently determine its own phase distortion characteristics without requiring external manual measurement processes for each individual vehicle, thereby reducing time and cost consumption while maintaining measurement precision.
3Productivity
If the phase curve is generalized from a few exemplary vehicles, then manpower and financial consumption is reduced, but accuracy is compromised due to inability to reflect individual vehicle deviation
Solution Approach 1:
The patent implements preliminary action by pre-measuring and storing the phase curve for each specific vehicle model during the manufacturing or setup phase. This pre-characterization creates a lookup table or database of vehicle-specific phase curves that can be quickly referenced during operation, eliminating the need for real-time individual measurements while maintaining high accuracy for each vehicle type.
4Device complexity
If a sensor is installed in a position where there is no phase distortion, then angle calculation is simplified, but the optimal mounting position is difficult to determine due to bumper mounting requirements
Solution Approach 1:
The patent introduces an intermediary element - the phase curve - that mediates between the physical constraint of bumper mounting and the computational requirement for accurate angle calculation. Instead of trying to eliminate phase distortion through careful sensor placement, the phase curve serves as an intermediary data structure that captures and compensates for the distortion, allowing the sensor to be mounted in the convenient rear bumper position while maintaining calculation accuracy.
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
The system improves angle calculation accuracy by generating phase curves that reflect bumper-specific distortions, enabling precise detection of objects around the vehicle despite phase distortions, thus enhancing operational efficiency and reducing resource consumption.
Implementation Method 1
a sensor device (e.g., radar) to which the phase mono-pulse algorithm is applied is mounted on the rear side portion of the vehicle
Implementation Method 2
phase distortion is inevitable due to diffuse reflection in the bumper
Data Source
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Figure 2B
AI summary
A vehicle control system may include a controller that detects an object outside a vehicle, calculates an angle based on a ratio of a relative speed between the object and the vehicle to a speed of the vehicle, and updates a phase curve reflecting a phase distortion of an input signal based on the calculated angle.