Vehicle Antenna Array Position Authentication

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Solution Overview

Problem

Existing vehicle remote control systems are vulnerable to theft due to indirect communication with repeaters, which can allow unauthorized access and starting of vehicles without proper authentication.

Innovation Solution

A remote controller with two key antennas spaced apart and a vehicle with multiple car antennas perform authentication by comparing received signal strength values to determine the distance between the antennas, ensuring only authorized devices can communicate and start the vehicle.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Ease of operation

If indirect communication with repeaters is allowed, then communication convenience is improved, but vehicle security deteriorates

Engineering Contradiction:

Improvecommunication convenienceVSAvoidvehicle security

Core Design Contradiction:

Ease of operationVSReliability

Solution Approach 1:

The remote controller is divided into multiple key antennas (first key antenna and second key antenna) spaced at a predetermined distance, allowing the system to segment the authentication process into multiple signal reception points for more reliable position verification

Inventive Principle:

Principle #1Segmentation

Solution Approach 2:

The vehicle controller acts as an intermediary that receives signal strength information from multiple car antennas and key antennas, processes this data to calculate distance, and performs authentication based on the calculated position, thereby mediating between communication convenience and security requirements

Inventive Principle:

Principle #24Intermediary (Mediator)

2Reliability

If multiple key antennas are used for authentication, then vehicle security is improved, but device complexity increases

Engineering Contradiction:

Improvevehicle securityVSAvoidremote controller structure

Core Design Contradiction:

ReliabilityVSDevice complexity

Solution Approach 1:

The multiple key antennas in the remote controller serve multiple functions: they enable both the authentication process and the position calculation simultaneously, rather than requiring separate components for each function

Inventive Principle:

Principle #6Universality (Multi-functionality)

Solution Approach 2:

The system changes from a single antenna to multiple antennas spaced at a predetermined distance, using the spatial parameter change to enable distance calculation through signal strength comparison, thereby improving security without requiring complex internal structures

Inventive Principle:

Principle #35Parameter changes

3Reliability

If distance-based authentication is implemented, then unauthorized access prevention is improved, but measurement precision requirements increase

Engineering Contradiction:

Improveauthentication accuracyVSAvoiddistance measurement precision

Core Design Contradiction:

ReliabilityVSMeasurement precision

Solution Approach 1:

The system replaces direct physical distance measurement with signal strength-based distance calculation, using electromagnetic signal propagation characteristics to infer distance without requiring complex measurement mechanisms

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The vehicle controller receives signal strength information from multiple antennas, calculates distance based on this feedback, and uses the calculated position to determine authentication outcome, creating a closed-loop system that improves reliability through iterative verification

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

Enhances security by accurately recognizing the remote controller's position and preventing unauthorized access, thereby reducing the risk of theft and improving user convenience and vehicle safety.

Implementation Method 1

a first key antenna; a second key antenna disposed at a predetermined distance from the first key antenna; a detector configured to detect the strength of a signal received by the first key antenna and the second key antenna

Methodology Applied

Scientific EffectElectromagnetic radiation: Electromagnetic Induction

Data Source

PatentUS10569741B1Remote controller, vehicle for communicating with the same and method for controlling the vehicle

Publication Date: 2020.02.25 HYUNDAI MOTOR CO LTD

AI summary

A vehicle communicating with a remote controller is provided. A vehicle includes a plurality of car antennas; a storage configured to store a distance value between the first and second key antennas; and a controller configured to select at least two of the plurality of car antennas, control transmission of signals through the selected at least two car antennas, obtain a distance value between the first and second key antennas of the remote controller based on the received signal strength and the transmission strength of the at least two car antennas when a received signal strength of at least two signals received by the first key antenna and a received signal strength value of at least two signals received by the second key antenna are received from the remote controller, and authenticate the remote controller based on the obtained distance value and the distance value stored in the storage.