The Terrain Following Task for the Advanced Tactical Fighter Using Discrete Optimal Control.
Abstract
Through the use of state space, continuous optimal control, and discrete optimal control, a digital flight control system was designed for the terrain following task. After formulating the aircraft linear perturbation model, the deterministic regulator problem was solved with a quadratic performance index to provide the desired continuous closed loop system. The system and performance index were then discretized to form a discrete deterministic regulator problem. This discrete regulator problem was then solved as a function of sample rate using eigenvector decomposition to determine a minimum acceptable rate for sampling. The effects of sample rate on the system were then examined. A sample rate of five hertz was shown to be high enough to adequately form the desired controls. A reference command generator based on constant energy path legs was developed to provide the required reference states and control inputs. The reference terrain following path was generated by an optimal cubic spline algorithm. The aircraft was shown to track the desired path in a highly acceptable manner through the use of a hybrid simulation. The design method utilized is recommended for consideration in designing the digital flight control system for other flight control tasks. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 01, 1977
- Accession Number
- ADA055196
Entities
People
- Ross Leon Simmons
Organizations
- Air Force Institute of Technology