External vision system

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An external vision system (XVS) refers to any of several methods to provide the pilot of an aircraft with a means to see outside the aircraft where traditional windscreens may not be feasible due to the aircraft configuration. An XVS would consist of external sensors, primarily video imagery, which is provided to the pilot(s) in real time via one or more displays intended to augment or replace the windscreen.

In recent[ when? ] years, other types of vision systems have been introduced primarily on business jets. Both enhanced vision systems (EVS) and synthetic vision system (SVS) have become standard equipment on many larger business jets such as those manufactured by Gulfstream, Bombardier, Dassault, and most recently, Embraer. However, EVS typically provides the pilot(s) with an infrared video image, usually displayed on the head-up display (HUD), which overlays the pilot view of the outside world through the windscreen. SVS is a computer generated version of the outside world created from an onboard terrain database. SVS can also be displayed conformally on the HUD, but it is not real time in that anything that is not part of the static terrain database cannot be displayed.

Both EVS and SVS are primarily intended to improve situational awareness of the flight deck crew, especially at night and in poor visibility weather conditions such as rain, snow, fog, or smoke. XVS is different in that it is intended to provide the flight deck crew a real time view of the outside world in visual meteorological conditions (VMC).

Research Efforts

NACA and later NASA conducted several flight experiments with onboard video systems in the late 1950s and 1960s. Renewed interest in XVS came again when civil supersonic transport aircraft such as the Concorde. Supersonic aircraft typically have long, protruding noses to reduce drag at high speeds. This creates a problem for designers who then may not be able to incorporate large enough windows to allow pilots the required view of the outside world. The solution on the Concorde was to have an articulating nose that drooped, exposing larger windows and allowing the pilots a better view during taxi, takeoff, approach, and landing. However, the structural and mechanism weight penalty for a solution similar to that used on the Concorde is undesirable and thus designers began looking for other solutions.

During the High Speed Civil Transport (HSCT) program, NASA and its industry partners began looking at an early XVS for use on a proposed US supersonic civil transport. [1] XVS was again proposed on the follow-on High Speed Research (HSR) program. [2]

In 2008, following the Quiet Spike supersonic research program, NASA and Gulfstream again collaborated on an XVS flight demonstration program using NASA's TF-18 flight test aircraft [3] [4] using commercial off-the-shelf High Definition video cameras and video displays while artificially restricting the aft seat pilot's view of the outside world.

As a follow-on research project, NASA Langley Research Center equipped a test aircraft with multiple HD cameras and displays to provide resolution nearly equivalent to "20/20" human visual acuity. [5]

Related Research Articles

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Tupolev Tu-144 Soviet supersonic passenger airliner

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Sonic boom Sound created by a object going as fast as the speed of sound

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Bell X-1 Experimental rocket-powered aircraft, the first airplane to break the sound barrier in level flight

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Supersonic transport Type of commercial airliner

A supersonic transport (SST) or a supersonic airliner is a civilian supersonic aircraft designed to transport passengers at speeds greater than the speed of sound. To date, the only SSTs to see regular service have been Concorde and the Tupolev Tu-144. The last passenger flight of the Tu-144 was in June 1978 and it was last flown in 1999 by NASA. Concorde's last commercial flight was in October 2003, with a November 26, 2003 ferry flight being its last airborne operation. Following the permanent cessation of flying by Concorde, there are no remaining SSTs in commercial service. Several companies have each proposed a supersonic business jet, which may bring supersonic transport back again.

Head-up display Transparent display presenting data within normal sight lines of the user

A head-up display, also known as a HUD, is any transparent display that presents data without requiring users to look away from their usual viewpoints. The origin of the name stems from a pilot being able to view information with the head positioned "up" and looking forward, instead of angled down looking at lower instruments. A HUD also has the advantage that the pilot's eyes do not need to refocus to view the outside after looking at the optically nearer instruments.

Glass cockpit Aircraft instrumentation system consisting primarily of multi-function electronic displays

A glass cockpit is an aircraft cockpit that features electronic (digital) flight instrument displays, typically large LCD screens, rather than the traditional style of analog dials and gauges. While a traditional cockpit relies on numerous mechanical gauges to display information, a glass cockpit uses several multi-function displays driven by flight management systems, that can be adjusted to display flight information as needed. This simplifies aircraft operation and navigation and allows pilots to focus only on the most pertinent information. They are also popular with airline companies as they usually eliminate the need for a flight engineer, saving costs. In recent years the technology has also become widely available in small aircraft.

Elevon

Elevons or tailerons are aircraft control surfaces that combine the functions of the elevator and the aileron, hence the name. They are frequently used on tailless aircraft such as flying wings. An elevon that is not part of the main wing, but instead is a separate tail surface, is a stabilator.

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Bristol 188

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Iven C. Kincheloe Award

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Droop nose (aeronautics)

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Supersonic aircraft Aircraft that travels faster than the speed of sound

A supersonic aircraft is an aircraft capable of supersonic flight, which is an aircraft able to fly faster than the speed of sound. Supersonic aircraft were developed in the second half of the twentieth century. Supersonic aircraft have been used for research and military purposes, but only two supersonic aircraft, the Tupolev Tu-144 and the Concorde, ever entered service for civil use as airliners. Fighter jets are the most common example of supersonic aircraft.

Synthetic vision system

A synthetic vision system (SVS) is a computer-mediated reality system for aerial vehicles, that uses 3D to provide pilots with clear and intuitive means of understanding their flying environment.

Quiet Spike 2000s aerospace program

Quiet Spike was a collaborative program between Gulfstream Aerospace and NASA's Dryden Flight Research Center to investigate the suppression of sonic booms. The patent was published with the United States Patent and Trademark Office in 2004 and is owned by Gulfstream Aerospace.

High Speed Civil Transport NASA project to develop a supersonic passenger aircraft

The High Speed Civil Transport (HSCT), a supersonic airliner, was the focus of the High-Speed Research (HSR) Program, a NASA program to develop the technology needed to design and build a supersonic transport that would be environmentally acceptable and economically feasible. The aircraft was to be a future supersonic passenger aircraft, baselined to cruise at Mach 2.4, or more than twice the speed of sound. The project started in 1990 and ended during 1999. The goal was to employ up-to-date technologies.

The Gulfstream X-54 is a proposed research and demonstration aircraft, under development in the United States by Gulfstream Aerospace for NASA, that is planned for use in sonic boom and supersonic transport research.

Enhanced flight vision system

An Enhanced flight vision system is an airborne system which provides an image of the scene and displays it to the pilot, in order to provide an image in which the scene and objects in it can be better detected. In other words, an EFVS is a system which provides the pilot with an image which is better than unaided human vision. An EFVS includes imaging sensors such as a color camera, infrared camera or radar, and typically a display for the pilot, which can be a head-mounted display or head-up display. An EFVS may be combined with a synthetic vision system to create a combined vision system.

Lockheed Martin X-59 QueSST Experimental supersonic aircraft for NASA

The Lockheed Martin X-59 QueSST is an American experimental supersonic aircraft being developed at Skunk Works for NASA's Low-Boom Flight Demonstrator program. Preliminary design started in February 2016, with the X-59 scheduled for delivery in late 2021 for flight tests from 2022. It is expected to cruise at Mach 1.42 and 55,000 ft (16,800 m), creating a low 75 Perceived Level decibel (PLdB) thump to evaluate supersonic transport acceptability.

References

  1. "High Speed Research". Archived from the original on 2013-02-24.
  2. "NASA - High-Speed Research Program Cockpit Fact Sheet".
  3. "NASA - NASA and Gulfstream Flying in High Def". NASA.
  4. "FLIGHTDECK FUTURES".
  5. "NASA Technical Reports Server (NTRS)".