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Space Shuttle: Difference between revisions
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[[File:Shuttle-approach06.jpg|600px|thumbnail|none|Touchdown and drag chute deployed]] | [[File:Shuttle-approach06.jpg|600px|thumbnail|none|Touchdown and drag chute deployed]] | ||
== Avionics and guidance systems == | |||
As of May 2015, the avionics of the simulated Space Shuttle is largely educational and neither HUD nor other displays resemble their real counterparts. However, the existing systems are sufficient to fly the spacecraft. | |||
The primary display is the HUD. This has four different modes - ascent, orbit, entry and approach, and dependent on the HUD mode, different information relevant for the mission phase is displayed. In all cases, the current CSS DAP is identified in the upper left. | |||
There is a calculator for orbital elements available, determining perigee and apogee, orbital inclination and longitude of the ascending node (the latter is currently not so useful as it is obtained in an inertial coordinate system). Based on these orbital elements, the groundtrack map displays current position of the Space Shuttle, selected landing site, ground track history and a prediction of the future orbit - if the perigee is below the surface of Earth, the prediction ends at the estimated ballistic impact point (note that due to the aerodynamical capabilities of the Shuttle, the actual landing site can be within a cross range of about 1000 miles around that point dependent on how the trajectory is managed during the entry phase). | |||
For the entry phase, there is also a guidance computer available which allows to select a landing site in orbit. The entry guidance can only be de-activated if the guidance can compute a halfway plausible de-orbit solution to the site - allow for no more than 10 degrees azimuth deviation and at least 3000 miles to site at the entry interface. If the entry guidance is active, target deceleration and azimuth deviation to site is displayed during the entry phase in the lower right of the HUD - by managing actual deceleration and azimuth of the trajectory the Shuttle can be aimed at the landing site (while the entry display is different in the real Shuttle, the guidance parameters are the same). | |||
[[File:Shuttle-landing01.jpg|600px|thumbnail|none|Groundtrack map and entry guidance computer for the Space Shuttle]] | |||
Apart from these, the Shuttle HUD contains a basic engine status display, speedbrake, body-flap and gear status indicators in the approach mode and yaw, pitch and roll rate indicators in orbit, as well as the normal pitch ladder and flightpath indicator of an airplane. | |||
== Mission phases == | == Mission phases == | ||