Crosswind Weighting Functions for Direct-Fire Projectiles.
Research and development technical rept,
ARMY ELECTRONICS COMMAND FORT MONMOUTH N J
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This report is a theoretical analysis of the crosswind weighting functions for high-speed direct-fire projectiles. These weighting functions are analogous to the path averaging weighting functions of an optical crosswind sensor. The wind weighting functions provide a convenient method for calculating the total crosswind correction required when variable crosswinds are encountered. Crosswind weighting functions are determined for variations in crosswinds along the trajectory. The methodology applies the least squares technique to computations from a standard ballistic computer model. This approach provides simple polynomial expressions for the wind weighting functions which are compared to simplified parabolic trajectory weighting functions. The results for three typical armor projectiles are found to be similar to the parabolic trajectory case with agreement best for short ranges. At ranges beyond approximately 2 kilometers, the actual weighting functions shift toward the target. The vertical weighting function is found to be relatively insensitive to the actual trajectory. The ideal parabolic trajectory vertical weighting function should be adequate for many purposes. Author