Engineers from the Southwest Research Institute have developed a cyber security system that can test for vulnerabilities in air vehicles and automated vehicles that use GPS receivers for positioning, navigation and timing.
Victor Murray, head of SwRI’s Cyber Physical Systems Group in the Intelligent Systems Division said, “This is a legal way for us to improve the cyber resilience of autonomous vehicles by demonstrating a transmission of spoofed or manipulated GPS signals to allow for analysis of system responses.”
GPS spoofing is a malicious attack that broadcasts incorrect signals to deceive GPS receivers, while GPS manipulation modifies a real GPS signal. GPS satellites orbiting the Earth pinpoint physical locations of GPS receivers embedded in everything from smartphones to ground vehicles and aircraft.
Southwest Research Institute (SwRI) designed the new tool to meet US federal regulations. Testing for GPS vulnerabilities in a mobile environment had previously been difficult because federal law prohibits over-the-air re-transmission of GPS signals without prior authorization.
SwRI’s spoofing test system places a physical component on or in line with a vehicle’s GPS antenna and a ground station that remotely controls the GPS signal. The system receives the actual GPS signal from an on-vehicle antenna, processes it and inserts a spoofed signal, and then broadcasts the spoofed signal to the GPS receiver on the vehicle. This gives the spoofing system full control over a GPS receiver.
The new system has so far been tested on an autonomous car and researchers will next explore the role of GPS spoofing in drones and aircraft.
While testing the system on an automated vehicle on a test track, engineers were able to alter the vehicle’s course by 10m, effectively causing it to drive off the road. The vehicle could also be forced to turn early or late.
“Most automated vehicles will not rely solely on GPS because they use a combination of sensors such as lidar, camera machine vision, GPS and other tools,” Murray said. “However, GPS is a basis for positioning in a lot of systems, so it is important for manufacturers to have the ability to design technology to address vulnerabilities.”
SwRI develops automotive cybersecurity solutions on embedded systems and internet of things (IoT) technology featuring networks and sensors. Connected and autonomous vehicles are vulnerable to cyber threats because they broadcast and receive signals for navigation and positioning.