Patent ID: 8176834
Filing Date: 2012-05-15
Classification: F41A,F41G

Abstract:
1. An automated method for determining fratricide probability of projectile collision from a projectile launcher on a platform and an interception hazard ejectable from a deployment position, the method comprising: determining a firing zone of the platform, said firing zone presenting an area through which the projectile launcher operates; calculating an angular firing zone area from said firing zone that extends from the projectile launcher; quantifying a frontal area of the interception hazard to produce an intercept area with respect to the projectile launcher; translating said frontal area across a flight trajectory of said intercept area to produce a path area; and determining the fratricide probability for said deployment position from dividing said path area by said angular firing zone are, wherein the platform is a combat vessel, the projectile launcher is a gun, the interception hazard is a missile, and the deployment position is a vertical launch cell, further including: calculating an integral for a rectangular solid angle as  as said firing solid angle Ω evaluating an intercept solid angle Ω where scaler magnitudes a, b, c represent distances and tensors {right arrow over (a)}, {right arrow over (b)}, {right arrow over (c)} represent vectors between respective said triangular points and the projectile launcher such that Ω ordnance =ΣΩ triangle , and dividing an intercept solid angle determined from discretizing said path area by a firing solid angle determined from azimuth bounds and elevation bounds of said firing zone as: where P f represents fratricidal probability, Ω ordnance represents said intercept solid angle, and Ω firingzone represents said firing solid angle.