Vehicle Radar Self-Calibration via Phase Correction
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Solution Overview
Problem
Vehicle radars can become misaligned due to external impacts, leading to errors in distance measurement and potential safety hazards during vehicle travel.
Innovation Solution
A self-calibration device and method for vehicle radars, which includes a transmission part and a reception part with phase correction and angle calculation capabilities, using a reflection plate to correct angular errors by comparing and adjusting the phases of reception signals from multiple receivers.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a radar is installed in a vehicle to measure distance and detect obstacles, then the vehicle can recognize forward vehicles and obstacles for safety, but the radar may become misaligned due to external impacts causing angular errors in measurement
Solution Approach 1:
The system performs preliminary calibration by transmitting a signal to a reflection plate and comparing phases before normal operation. This preliminary phase comparison establishes reference values that compensate for potential misalignment, preventing angular errors from affecting subsequent measurements.
Solution Approach 2:
The radar system performs self-calibration using its own transmission and reception capabilities. By comparing phases of signals received by different receivers and automatically adjusting based on the comparison, the system corrects its own angular errors without external intervention.
2Measurement precision
If phase comparison and correction mechanisms are added to correct angular errors, then measurement accuracy is improved, but device complexity increases
Solution Approach 1:
The transmission part and reception part serve dual purposes: they perform both normal radar operation (detecting obstacles and measuring distances) and calibration functions (phase comparison and correction). This multi-functionality allows the system to achieve precise angular measurement without adding dedicated calibration hardware.
Solution Approach 2:
The system implements a feedback mechanism where the phase comparison part continuously compares phases of reception signals and feeds back correction information to the angle calculation part. This automatic feedback loop maintains measurement accuracy by continuously compensating for angular errors based on real-time phase differences.
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 self-calibration device improves the reliability and safety of vehicle radar systems by correcting angular errors, ensuring accurate distance measurement and obstacle detection.
Implementation Method 1
a transmission part for outputting a transmission signal to a reflection plate disposed at the front of the vehicle; and a reception part for receiving a reception signal reflected by the reflection plate
Data Source
AI summary
A self-calibration device for a vehicle radar, according to one embodiment of the present invention, comprises: a transmission part for outputting a transmission signal to a reflection plate disposed at the front of a vehicle; and a reception part for receiving a reception signal reflected by the reflection plate, wherein the reception part comprises: a phase correction part for correcting a phase of the reception signal; and an angle calculation part for setting the corrected phase as a reference value.