For the case of planar interception, the so called relative heading error angle between the relative velocity vector and the LoS (Line of Sight) is chosen as the output to be controlled to zero.

Arbitrary Angle of sight line rotation is measured and Angle measurement is stopped at any time to start shooting by using the device.

Based on the analysis of present methods for atmospheric refraction correction, a new correction model is put forward based on the refraction Angle of the line of sight.