Vehicle Radar Phase Correction for Accurate Target Direction

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Solution Overview

Problem

Vehicle radar devices face challenges in accurately measuring the direction of targets due to phase measurement errors and the setting of pulse repetition intervals, which can lead to deteriorated direction measurement accuracy.

Innovation Solution

A vehicle radar device with an antenna unit, signal processor, and controller that uses a phase difference between reception signals to determine target direction information. The device operates in two modes with different pulse repetition intervals, allowing for phase correction of reception signals if a preset condition is met.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Reliability

If signal transmission uses two or more transmission antennas, then the radar device can achieve better target detection performance, but the direction measurement accuracy deteriorates due to time difference between transmission antennas or pulse repetition interval settings

Engineering Contradiction:

Improvetarget detection performanceVSAvoiddirection measurement accuracy

Core Design Contradiction:

ReliabilityVSMeasurement precision

Solution Approach 1:

The patent applies preliminary action by measuring the phase difference between reception signals from multiple receiving antennas and calculating the direction of arrival before final target detection. This preliminary phase difference measurement allows the system to establish reference direction information that can be used to correct timing-related measurement errors in subsequent multi-antenna transmission operations, thereby maintaining high direction measurement accuracy while achieving good target detection performance

Inventive Principle:

Principle #10Preliminary action

Solution Approach 2:

The patent implements feedback by using the measured phase difference information and calculated direction of arrival as reference data to correct timing synchronization and pulse repetition interval settings in multi-antenna transmission. The system continuously monitors direction measurement accuracy and adjusts transmission timing parameters based on this feedback, resolving the contradiction between using multiple transmission antennas for better detection and maintaining accurate direction measurement

Inventive Principle:

Principle #23Feedback

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 solution improves direction measurement accuracy for targets by correcting phase measurement errors and optimizing pulse repetition intervals, thereby enhancing the overall performance of the vehicle radar device.

Implementation Method 1

a receiving antenna for receiving a reception signal reflected from a target

Methodology Applied

Scientific EffectElectromagnetic radiation reflection: Reflection

Implementation Method 2

determine target direction information by using a phase difference between the reception signals received from the respective receiving antennas

Methodology Applied

Scientific EffectPhase difference:

Data Source

PatentUS12332345B2Radar device for vehicle and controlling method thereof

Publication Date: 2025.06.17 HL KLEMOVE CORP

AI summary

The embodiments of the present disclosure relate to a radar device including an antenna unit including a transmission antenna for transmitting a transmission signal and a receiving antenna for receiving a reception signal reflected from a target, a signal processor configured to determine target direction information by using a phase difference between the reception signals received from the respective receiving antennas, and a controller configured to control to perform a first mode and a second mode for transmitting and receiving signals at different pulse repetition intervals, respectively.