Abstract: “There are many errors to affect the system hit probability. Fixed bias, variable bias and random error are main categories for many errors. In this paper, a parallax error is considered. The parallax error belongs to the fixed bias. The fixed bias cannot be controlled by the shooting control device. The parallax error depends on the distance between the positions of the EOTS (electronic optical tracking device) and the gun. We calculate the error effect at the target by using the mil unit. The definition of a mil is based on a unit circle with a radius of one and 6400 mils mean the circumference in one turn. This analysis for the parallax error is a good guideline for design of the combat vehicle with gun having good system hit probability.”

Keywords: system hit probability, combat vehicle, target, gun, fixed bias.