1,360
edits
Space Shuttle Avionics: Difference between revisions
Jump to navigation
Jump to search
→HORIZ SIT (SPEC 50)
| Line 220: | Line 220: | ||
With a somewhat misleading designation, the HORIZ SIT display is actually the central managing display for the landing site selection and area navigation, and only in addition to that it provides a horizontal view of the TAEM guidance. | With a somewhat misleading designation, the HORIZ SIT display is actually the central managing display for the landing site selection and area navigation, and only in addition to that it provides a horizontal view of the TAEM guidance. | ||
The upper left is used to enter the landing site and choose the runway. Below the TAEM pattern is specified, i.e. whether to fly and overhead or straight-in approach and whether to use nominal or minimal entry point. The right portion of the display allows to enter navigation corrections manually. Finally, the lower portion contains the navigation data management during entry and TAEM - it shows the various sensors (TACAN, GPS, drag altitude, air data probe altitude), their residual with respect to the currently used state vector and their usability ratio as well as the target azimuth and target range obtained by using the respective sensor. | |||
Finally, the graphical portion shows the heading alignment cone (HAC), the final approach and the touchdown point as well as predictors of the Shuttle position 20, 40 and 60 seconds into the future which allow to aim the trajectory properly onto the HAC. | |||
Most of the items are meaningful in FG, in particular every sensor is characterized by a quality with respect to the currently propagated and the true state vector. | |||
=== OVERRIDE (SPEC 51) === | === OVERRIDE (SPEC 51) === | ||