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Probability of survival for the position calculation, you can use the literature in a rough estimate for analytical formula, the specific method, the whole position as a point target, that is, to position the center point of the attack. Solving for the position of a certain type of bomb damage radius, can be incorporated into the analytical. However, in practice, as opposed to the destruction of the radius of incoming weapons, and position as a point target is bound to lead to significant error. Therefore, this article intended to be position-level analysis of this system may be targeted by the classification of the sub-indicators in accordance with the importance of the survival probability derived system