FlightTracker Foxlin, Eric; Altshuler, Yury; Naimark, Leonid ...
Proceedings of the 3rd IEEE/ACM International Symposium on Mixed and Augmented Reality,
11/2004
Conference Proceeding
One of the earliest fielded augmented reality applications was enhanced vision for pilots, in which a display projected on the pilot's visor provides geo-spatially registered information to help the ...pilot navigate, avoid obstacles, maintain situational awareness in reduced visibility, and interact with avionics instruments without looking down. This requires exceptionally robust and accurate head-tracking, for which there is not a sufficient solution yet available. In this paper, we apply miniature MEMS sensors to cockpit helmet-tracking for enhanced/synthetic vision by implementing algorithms for differential inertial tracking between helmet-mounted and aircraft-mounted inertial sensors, and novel optical drift correction techniques. By fusing low-rate inside-out and outside-in optical measurements with high-rate inertial data, we achieve millimeter position accuracy and milliradian angular accuracy, low-latency and high robustness using small and inexpensive sensors.
The Wide Area Augmentation System (WAAS) will provide real‐time differential GPS corrections and integrity information for aircraft navigation use. The most stringent application of this system will ...be precision approach, which requires the use of differential ionospheric corrections. WAAS must incorporate information from reference stations to create an ionospheric correction map. More important, this map must contain confidence bounds describing the integrity of the corrections. The difficulty in generating these corrections is that the reference station measurements are not collocated with the aviation user measurements. This is not a problem for an undisturbed ionosphere over the conterminous United States (CONUS), as the ionosphere is nominally smoothly varying. However, a concern is that irregularities in the ionosphere will decrease the correlation between the ionosphere observed by the reference stations and that seen by the user. It is essential to detect when such irregularities may be present and increase the confidence bounds.
