UDC 629.762 Estimation of Aerodynamic Derivatives of Projectiles from Aeroballistic Range Data using Maximum Likelihood Method

niis paper describes tlie application of the maxiniuni likelihood method to estimate the aerodynamic derivatives of ( i) the AGARD sfandard ballistic niodel HB-2 from supersonic free flight data available in liferature, and (ii) ballistic mode simulated data of a surface-to-air missile. For the AGARD dam, two types of dynamic models have been used: (i) body axis coordinate system model, and (ii) hybrid type offorniulafioii. wherein flie aerodynamic forces are irr wind axis arid the aerodynamic monients are represenfed in body axis coordinale system. For surface-to-air rnissile data tlie equations offnotion are solved in fin-body axis systern. The results ofthis analysis denionsfrate the suitabiliry arid fiincliortol adequacy of the mathernutical models used, the consistoicy of data arid power of tlie parameter estimation r?iefhodology in generating aerodytiarnic derivatives froin realistic free flighf trajectories. reference area axial force coefficients in the body-coefficients of drag, lift and normal coefficients of rolling, pitching and inerti