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GUIDANCE, NAVIGATION AND CONTROL
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"GUIDANCE, NAVIGATION AND CONTROL
Guidance, navigation and control software command the GN&C system to effect vehicle control and to provide the sensor and controller data needed to compute these commands. The process involves three steps: guidance equipment and software first compute the orbiter location required to satisfy mission requirements, navigation then tracks the vehicle's actual location, and flight control then transports the orbiter to the required location.
A redundant set of four orbiter general-purpose computer s forms the primary avionics software system; a fifth GPC is used as the backup flight system.
The GPCs interface with the various systems through the orbiter's flight forward and flight aft multiplexers/demultiplexers . The data buses serve as a conduit for signals going to and from the various sensors that provide velocity and attitude information as well as for signals traveling to and from the orbiter propulsion systems, orbiter aerodynamic control surfaces, and displays and controls .
The GN&C system consists of two operational modes: auto and manual (control stick steering). In the automatic mode, the primary avionics software system essentially allows the GPCs to fly the vehicle; the flight crew simply selects the various operational sequences. The flight crew may control the vehicle in the control stick steering mode using hand controls, such as the rotational hand controller , translational hand controller , speed brake/thrust controller and rudder pedals . The translational hand controller is available only for the commander, but both the commander and pilot have a rotational hand controller .
In the control stick steering mode, flight crew commands must still pass through and be issued by the GPCs . There are no direct mechanical links between the flight crew and the orbiter's various propulsion systems or aerodynamic surfaces; the orbiter is an entirely digitally controlled, fly-by-"
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