It means that the NOA cannot deal with unexpected situations. Finally, flight path generation using NOA is possible when designers know the physical characteristics and information of the target maneuvers. So the NOA cannot be used in battlefields because the environment of battlefields rapidly changes. This is the most critical disadvantage of NOA. Second, NOA does not guarantee existence of solution satisfying the constraints and boundary conditions. So, small aircraft cannot use the state-of-the-art processor.
Also, the electric power consumption is increased. However, state-of-the-art processors using parallel processing methods raise the weight and volume of the payload. To overcome this disadvantage, the parallel processing method is applied to the NOA. The increment of the number of constraints and boundary conditions reduces the calculation speed of NOA. The constraints and boundary conditions are defined when the flight path is generated. First, the NOA cannot guarantee the real-time flight path generation. However, the NOA has the two disadvantages. Most researchers have developed the flight path generation techniques by using a numerical optimization algorithm (NOA) to maximize the flight performance and to guarantee the survivability of aircraft. The flight performance of manned or unmanned aircraft has to be maximized to perform the entire mission in dynamically changing environments such as battlefields. This study can affect the development of flight techniques for aircraft tactical maneuvers and the modification of air force operational manuals. Finally, flight simulations are implemented for the longitudinal loop and Immelmann-turn maneuvers to check the usefulness of the proposed maneuver library generation technique. Moreover, the FCS is used for implementing tactical maneuvers. The attitude command attitude hold (ACAH) system, the rate command rate hold (RCRH) system, and the speed command speed hold (SCSH) system using the proportional-integral-derivative (PID) control technique are designed to minimize the complexity of the flight control system (FCS) and to reduce the weight and volume of the payload. Firstly, the general maneuver libraries are defined, and then 7 th-order polynomials are used to create the maneuver libraries. This study develops the real-time maneuver library generation technique for performing aggressive maneuvers of fixed-wing aircraft.