‘Hyperbolic Airborne Radio Navigation’

Vlf Airborne Navigation Requirements

Autonomous Airborne Video-Aided Navigation

We present an autonomous airborne video-aided navigation system that uses video from an onboard camera, data from an IMU, and digitally stored georeferenced landmark images. The system enables self-contained navigation in the absence of GPS. Relative position and motion are tracked by comparing simple mathematical representations of consecutive video frames. Periodically, a single image frame i...

Guidance and Navigation for UAV Airborne Docking

Unmanned aerial vehicle (UAV) capability is currently limited by the amount of energy that can be stored onboard. Airborne docking, for mid-air refueling, is a viable solution that has been implemented with manned aircraft for decades, but has yet to be achieved with their unmanned counterparts. The prohibitive challenge is the highly accurate and reliable relative positioning performance that ...

Radio Navigation: Perspectives and Challenges

Society, including many European governments, has a strong belief in the reliability of today’s primary radio navigation system, GPS. Unfortunately, space-based as well as terrestrial-based systems have some serious limitations that cannot be ignored if continuity of service plays a keyrole in the process in which these systems are used. The paper indicates some weaknesses of radio navigation s...

Hyperbolic Self-Organizing Maps for Semantic Navigation

We introduce a new type of Self-Organizing Map (SOM) to navigate in the Semantic Space of large text collections. We propose a “hyperbolic SOM” (HSOM) based on a regular tesselation of the hyperbolic plane, which is a non-euclidean space characterized by constant negative gaussian curvature. The exponentially increasing size of a neighborhood around a point in hyperbolic space provides more fre...