SCIENTIFIC AND TECHNICAL AEROSPACE REPORTS

A Biweekly Publication of the National Aeronautics and Space Administration
VOLUME 43, ISSUE 20 - OCTOBER 07, 2005

04 AIRCRAFT COMMUNICATIONS AND NAVIGATION
Includes all modes of communication with and between aircraft; air navigation systems (satellite and ground based); and air traffic control.

For related information see also 06 Avionics and Aircraft Instrumentation, 17 Space Communications, Spacecraft Communications, Command and Tracking, and 32 Communications and Radar.

20050215313 Alabama Univ., Huntsville, AL, USA

Controls for Reusable Launch Vehicles During Terminal Area Energy Management

Driessen, Brian J.; The 2004 NASA Faculty Fellowship Program Research Reports; January 2005, pp. XIII-1 - XIII-5; In English; See also 20050215300; No Copyright; Avail.: CASI: A01, Hardcopy

During the terminal energy management phase of flight (last of three phases) for a reusable launch vehicle, it is common for the controller to receive guidance commands specifying desired values for (i) the roll angle roll q(sub roll), (ii) the acceleration a(sub n) in the body negative z direction, -k(sub A)-bar, and (iii) omega(sub 3), the projection of onto the body-fixed axis k(sub A)-bar, is always indicated by guidance to be zero. The objective of the controller is to regulate the actual values of these three quantities, i.e make them close to the commanded values, while maintaining system stability. Derived from text

Reusable Launch Vehicles; Terminal Area Energy Management

Source: NASA.