Research of projectile trajectory correction methods in function of their range and precision enhancement

Long- and medium-range artillery rockets are used for indirect fire on distant targets. As they have a large impact point dispersion, they are considered to be area weapons. Nevertheless, a control system is required in order to reduce the dispersion and increase the hit probability. The pulse jet control systems are simple and efficient enough to be implemented on artillery rockets and to produce acceptable impact point dispersions. However, as they are highly energy-limited, it is necessary to perform an optimization of the control logic in order to obtain a satisfactory performance with the minimum number and intensity of control pulses. A modification of the published Window-based Trajectory Tracking control method has been presented for the application on artillery rockets, as well as the new, two-phase guidance scheme named Trajectory Tracking with Pulse Frequency Modulation. Both schemes are considering the fact that an artillery rocket flies through different atmospheric environments, which demands a time- or altitude-varying control law in order to achieve high hit precision with the limited number of pulse jets aboard. Also a simplified and cost-effective control scheme called Active Damping is presented with the purpose to perform correction of disturbances at the muzzle. Simulation studies have been conducted in order to perform parametric and performance analyses. It is shown that the Modified Window-based Trajectory Tracking achieves satisfactory performance for artillery rockets hit points dispersion. The Trajectory tracking with Pulse Frequency Modulation performs significantly better, and, in the case of high number of pulse jets, this control scheme is capable of achieving an almost pinpoint precision. The Active Damping control method introduces a cost effective method to significantly lower the number of rockets needed for destruction of the target. Artiljerijske rakete srednjeg i velikog dometa se koriste na bojištu za indirektno gađanje udaljenih ciljeva. Imajući veliko rasturanje pogodaka, koriste se za gađanje celih oblasti iz višecevnih lansera. Primenom odgovarajućeg upravljačkog sistema moguće je znatno smanjiti rasturanje i povećati verovatnoću pogađanja ciljeva. Upravljački sistemi sa reaktivnim impulsima su dovoljno jednostavni da se mogu primeniti na artiljerijskim raketama i efikasni da ostvare zadovoljavajuće rasturanje pogodaka. Njihov energetski resurs je, međutim, ograničen, tako da je neophodno da se izvrši optimizacija