Wavelength-Diverse Laser Sensor for LiDAR Spoofing Detection
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Solution Overview
Problem
Conventional countermeasures against spoofing attacks on LiDAR sensors require multiple LiDARs, which are not feasible for compact devices like UAVs, and no effective solutions exist to prevent deception attacks on sensor fusion processing.
Innovation Solution
A laser sensor system comprising a main laser emitting specific wavelengths, a dummy laser emitting a different wavelength, and light-receiving elements sensitive to these wavelengths, with a mechanism to rotate all components for 360-degree measurement, and signal processing to distinguish between true and false reflections.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If multiple LiDARs are installed to counter spoofing attacks, then sensor fusion integrity is improved, but device cost and complexity increase
Solution Approach 1:
The patent segments the LiDAR system into multiple independent laser transmitters operating at different wavelengths (e.g., 905nm and 1550nm) and a light-receiving element that can detect these wavelengths. This segmentation allows the system to use wavelength diversity for spoofing attack detection without requiring multiple complete LiDAR units, thus maintaining sensor fusion integrity while reducing device complexity and cost.
2Reliability
If multiple wavelengths are adopted for spoofing attack countermeasures, then attack detection capability is improved, but manufacturing cost increases
Solution Approach 1:
The patent implements a universal light-receiving element capable of detecting multiple wavelengths (both 905nm and 1550nm). This multi-functional component allows the system to detect spoofing attacks across different wavelengths using a single sensor, improving attack detection capability while avoiding the need for multiple separate sensors and reducing manufacturing cost.
3Object-affected harmful factors
If light-receiving angle is narrowed to reduce spoofing attack vulnerability, then attack surface is reduced, but measurement coverage decreases
Solution Approach 1:
The patent changes the parameter of laser wavelength to combat spoofing attacks instead of narrowing the light-receiving angle. By using multiple wavelengths and detecting wavelength-specific characteristics, the system maintains a wide light-receiving angle for comprehensive measurement coverage while becoming resistant to spoofing attacks that cannot replicate multiple wavelengths simultaneously.
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
Prevents incorrect object detection due to spoofing attacks by identifying and eliminating false reflections, reducing the attacker's deception capability and cost-effectively securing sensor fusion integrity.
Implementation Method 1
a main laser to emit laser light of a specific wavelength
Implementation Method 2
a dummy laser to emit laser light of a wavelength different from the specific wavelength
Implementation Method 3
a light-receiving element sensitive to light of the specific wavelength
Implementation Method 4
Measurement using the ToF principle refers to a method of calculating a distance based on a time period from when laser light is emitted until the laser light that is reflected after hitting a subject (reflected light) is received by a sensor
Data Source
AI summary
A laser sensor (110) includes a first main laser (111) to emit laser light of a first wavelength, a second main laser (112) to emit laser light of a second wavelength, a dummy laser (113) to emit laser light of a third wavelength, a first light-receiving element (114) sensitive to light of the first wavelength, and a second light-receiving element sensitive to light of the second wavelength. The first main laser and the second main laser alternately emit the laser light.