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Combat Optimization and Analysis Program - COAP Volume III: Programmer's Manual

Report Number: AFFDL TR 71-52 Volume III
Author: Hague, D. S.
Author: Jones, R. T.
Author: Glatt, C. R.
Corporate Author: Aerophysics Research Corporation
Laboratory: Air Force Flight Dynamics Laboratory
Date of Publication: 1971-05
Pages: 488
Contract: F33615-70-C-1036
Project: None Given
AD Number: AD0735293

A program for trajectory optimization by the variational steeoest-descent is described in detail. The program capability includes search for optimal initial conditions; search for optimal arc (stage) lengths; constraints defined at terminal point, intermediate corners (stage points), or along the path; payoff function at termianl point or intermediate corner (stage point); search for optimum parameter (design variable) values; and two system (vehicle) problems with or without reacting feed-back from the second system (vehicle). The program also incorporates an alternative direct multivariable search approach to trajectory optimization employing a variety of multivariable search algorithms including elemental perturbation (one parameter at a time), organized first- and second-order methods, and randomized methods. A method for solution for problems exhibiting multiple extremals and a procedure for the location of saddle points is also included in the program. Point mass equations of motion for a two-vehicle system are available in the program. Motion takes place about a rotating oblate planet having up to four harmonics in its gravitational field, non-uniform atmosphere (1959 or 1962 ARDC), and winds. Auxilliary computations for aerodynamic heating are included. The vehicles may have arbitrary and independent aerodynamic and propulsive characteristics. Combative logic defined in terms of vehicle relative states is available in the program. The logic defines feedback control on the basis of relative state. Variational optimization procedures may be employed to determine optimal open loop control against a reacting opponent employing feedback control defined by combat logic. Alternately, the combative feedback control logic can be parameterized permitting the use of multivariable search for the definition of optimal feedback control parameters against a reacting opponent. By parameterization of both vehicle feedback control logic, a "mini-max" situation capable of solution by multivariable search for a saddle point can be considered. All capabilities described are available in a single general purpose FORTRAN IV digital computer program developed for the CDC 6600 computer.

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