RFID Backscatter Sensing for Contact-Free Road Surface Detection

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Solution Overview

Problem

Existing vehicle-mounted sensors for detecting road surface conditions, such as LIDAR and cameras, are costly, heavy, and unreliable in inclement weather, while smartphone-based solutions rely on vehicle vibrations and are not contact-free.

Innovation Solution

A system using commodity passive RFID tags and readers attached to a vehicle's front end for transmitting and receiving radiofrequency signals to analyze backscattered signals, employing signal cancellation to determine road surface conditions, including bumps and potholes, without requiring line-of-sight.

Engineering Contradictions & Design Principles

VSEngineering Contradiction Analysis

1Measurement precision

If LIDAR or camera sensors are used to detect road surface shape, then measurement precision is improved, but device complexity and cost increase

Engineering Contradiction:

Improveroad surface shape detection accuracyVSAvoidsensor system complexity

Core Design Contradiction:

Measurement precisionVSDevice complexity

Solution Approach 1:

The patent replaces complex optical sensing systems (LIDAR, cameras) with a simplified electromagnetic field-based RFID sensing system. The RFID reader uses radio frequency signals to detect road surface conditions through backscattering effects, eliminating the need for complex optical components while maintaining detection capability.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

Solution Approach 2:

The patent employs inexpensive RFID tags and readers instead of costly LIDAR or camera systems. These commodity RFID components can be easily replaced or upgraded, providing a cost-effective solution for road surface detection that significantly reduces system complexity and expense.

Inventive Principle:

Principle #27Cheap short-living objects (Disposable)

2Measurement precision

If LIDAR or camera sensors are used to detect road surface shape, then measurement precision is improved, but weight increases

Engineering Contradiction:

Improveroad surface shape detection accuracyVSAvoidsensor system weight

Core Design Contradiction:

Measurement precisionVSWeight of moving object

Solution Approach 1:

The patent substitutes heavy optical sensors with lightweight RFID electronic components. The RFID reader and tags use electromagnetic fields for detection, requiring minimal physical mass compared to LIDAR lasers, cameras, and their supporting mechanical structures, thereby significantly reducing vehicle weight.

Inventive Principle:

Principle #28Mechanics substitution (Replace mechanical system)

3Measurement precision

If visual-wavelength sensors (LIDAR, cameras) are used to detect road surface, then measurement precision is improved, but reliability deteriorates in inclement weather

Engineering Contradiction:

Improveroad surface detection accuracyVSAvoiddetection reliability in fog, rain, dust

Core Design Contradiction:

Measurement precisionVSReliability

Solution Approach 1:

The patent changes the detection parameter from visual wavelength (optical frequency) to radio frequency. RFID signals operate at lower frequencies that penetrate fog, rain, and dust more effectively than visible light or near-infrared LIDAR wavelengths, maintaining reliable detection in inclement weather conditions where optical sensors fail.

Inventive Principle:

Principle #35Parameter changes

4Device complexity

If smartphone-based vibration sensing is used, then device complexity is reduced, but measurement precision deteriorates due to reliance on vehicle vibrations

Engineering Contradiction:

Improvesensor system simplicityVSAvoidroad surface condition detection accuracy

Core Design Contradiction:

Device complexityVSMeasurement precision

Solution Approach 1:

The patent introduces RFID tags as intermediary sensing elements that directly interact with the road surface through electromagnetic backscattering. Instead of relying on indirect vehicle vibrations, the RFID tags detect road conditions directly and transmit this information to the reader, improving measurement precision while keeping the system simple.

Inventive Principle:

Principle #24Intermediary (Mediator)

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

Enables low-cost, contact-free, and reliable road surface sensing in various weather conditions, providing accurate information on road surface conditions for safe driving.

Implementation Method 1

receiving, by a first radiofrequency identification (RFID) tag, a first backscattered radiofrequency signal from the road surface

Methodology Applied

Scientific EffectBackscattering: Scattering

Data Source

PatentUS12411082B2Methods and systems for sensing a road surface

Publication Date: 2025.09.09 OHIO STATE INNOVATION FOUND

AI summary

An example system for remote sensing of a road surface includes an antenna configured to transmit and receive radiofrequency (RF) signals, where the antenna is configured to attach to a front end of a vehicle; at least one radiofrequency identification (RFID) tag, where the at least one RFID tag is configured to attach to the front end of a vehicle; and an RFID reader, wherein the RFID reader is configured to: cause the antenna to transmit a radiofrequency signal toward a road surface, where the at least one RFID tag receives a backscattered RF signal from the road surface; receive, from the antenna, an RFID signal from the first RFID tag, the RFID signal comprising phase and magnitude information; and analyze the phase and magnitude information to determine a condition of the road surface.