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A Method for Obtaining Aerodynamic Coefficients from Yawsonde and Radar Data
ARMY BALLISTIC RESEARCH LAB ABERDEEN PROVING GROUND MD
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A numerical integration method for the reduction of yawsonde data from instrumented projectiles in free flight has been developed. Yawsonde data represent two-dimensional information solar aspect angle and spin while the actual motion is three-dimensional pitch, yaw, and spin. The method obtains a best fit of the aerodynamic coefficients in the equations of motion using numerical integration. The coefficients are iteratively adjusted. Linear aerodynamic coefficients have been derived from the flight of an M549, 155mm rocket assisted projectile.
APPROVED FOR PUBLIC RELEASE