Abstract: In view of the fact that more and more importance is attached to electronic counter measures (ECM) while the searching angle of terminal guidance radar of an anti-ship missile is becoming widened, this article introduces a model to confirm the minimal searching angle of terminal guidance radar of an anti-ship missile. First, a basic model is established by means of an analytic algorithm according to the requirement that acquisition probability should reach no less than 0.99, and by supposing the target moving area in searching pie slice and the error of target indication precision as a circularity. Second, the model is improved based on a synthesis of the main error as an error of the target indication precision and an error of the moving horizontal distance to the side. Then, the minimal searching angle of terminal guidance radar of the anti-ship missile is simulated at a working distance of 30, 35 and 40 km on conditions of high subsonic and supersonic speeds. The minimal searching angle of the high subsonic speed anti-ship missile is found to be in the range between -40°and +40°while the range for the supersonic speed anti-ship missile is between -27° and +27°. This represents a smaller search range than that of certain in-service anti-ship missiles.

Key words: anti-ship missile, terminal guidance radar, minimal searching angle, errors, acquisition probability