T he dissemination of warning messages in a reliable and timely fashion is critical for safety in vehicular ad hoc networks. Conventional telematics solutions use a radar-type mechanism that detects an obstacle ahead of a vehicle and then activates the brakes to avoid a crash. But this technology lets vehicles perceive an obstacle only when it's physically in front of them. If vehicles could ta...

Abstract Positioning, Navigation and Timing (PNT) are services generally provided by Global Satellite Systems (GNSS). GNSS reside in medium to high orbital altitudes from the Earth’s surface, resulting weak signal reception. However, user applications increasingly need of higher power strength or alternative PNT solutions. An influx satellites Low Earth Orbit (LEO) driving such innovation techn...

Falsifying Global Navigation Satellite System (GNSS) data with a simulator or with a fake receiver can have a significant economic or safety impact in many transportation applications where Position, Velocity and Time (PVT) are used to enforce a regulation. In this context, the authentication of the source of the PVT data (i.e., the GNSS receiver) is a requirement since data faking can become a...

In Stage 1 of 4 experiments in which rats completed a water-maze blocking procedure, experimental groups were trained to use a predictive beacon (hanging above, connected to, or displaced from the platform) to find a submerged escape platform in the presence of predictive or irrelevant background cues and in the presence or absence of irrelevant landmarks. In Stage 2, a fixed beacon, landmarks,...

| Jamming is the act of intentionally directing powerful electromagnetic waves toward a victim receiver with the ultimate goal of denying its operations. This paper describes the main types of Global Navigation Satellite System (GNSS) jammers and reviews their impact on GNSS receivers. A survey of state-of-the-art methods for jamming detection is also provided. Different detection approaches ar...

Beacon attraction is a movement system whereby a robot (modeled as a point in 2D) moves in a free space so as to always locally minimize its Euclidean distance to an activated beacon (also a point). This results in the robot moving directly towards the beacon when it can, and otherwise sliding along the edge of an obstacle. When a robot can reach the activated beacon by this method, we say that...

In some security-critical applications, a GPS satellite-navigation receiver is integrated with a tamper-resistant cryptographic module in order to provide remote attestation of location. Those in possession of the receiver may have an interest in it producing an incorrect output. Vehicle and container tracking, usage-based road charging, prisoner tagging, location-based access control are just ...