NASA Technical Reports Server (NTRS) : GPS pdf

NASA Technical Reports Server (NTRS) : GPS

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Description of the Book:

A GPS auto-navigation system is designed for Unmanned Air Vehicles. The objective is to enable the air vehicle to be used as a test-bed for novel flow control concepts. The navigation system uses pre-programmed GPS waypoints. The actual GPS position, heading, and velocity are collected by the flight computer, a PC104 system running in Real-Time Linux, and compared with the desired waypoint. The navigator then determines the necessity of a heading correction and outputs the correction in the form of a commanded bank angle, for a level coordinated turn, to the controller system. This controller system consists of 5 controller! (pitch rate PID, yaw damper, bank angle PID, velocity hold, and altitude hold) designed for a closed loop non-linear aircraft model with linear aerodynamic coefficients. The ability and accuracy of using GPS data, is validated by a GPS flight. The autopilots are also validated in flight. The autopilot unit flight validations show that the designed autopilots function as designed.

The aircraft model, generated on Matlab SIMULINK is also enhanced by the flight data to accurately represent the actual aircraft

• Creator/s: NASA Technical Reports Server (NTRS
• Date: 12/10/2003
• Year: 2003
• Book Topics/Themes: NASA Technical Reports Server (NTRS), GLOBAL POSITIONING SYSTEM, NAVIGATION, AIRCRAFT MODELS, AERODYNAMIC COEFFICIENTS, AIRBORNE/SPACEBORNE COMPUTERS, CONTROL THEORY, FEEDBACK CONTROL, FLIGHT CONTROL, REAL TIME OPERATION, Nilsson, Caroline C. A., Heinzen, Stearns N., Hall, Charles E., Jr., Chokani, Ndaona

An excerpt captured from the PDF book