FIELD: armament and military equipment, in particular, protection of fighting vehicle against means of air attack, for example, by means of machine-gun (gun) mountings. SUBSTANCE: after a time not less than the time of observation Tob(t≥Tob) from the moment of target lock-on the target range is predicted as a function of range, closure rate at the last reliable measurement of range, parameters of relative motion of sighting line, fighting vehicle speed, frequency of range finding and quantity of doubtful measurements, and the analysis of the quantity of reliable measurements m is performed out of number n made during time of observation Tob, and before computation of angular corrections determined is the rate of closure of target with fighting vehicle according to one of three mathematic expressions, depending on the results of performed range measurements. The device for determination of angles of lead of the computing system additionally comprises a device for determination of range D and closure rate D; as well as units for computation of the closure rate according to the respective three mathematic expressions. EFFECT: enhanced efficiency of fire of fighting vehicle at air target due to enhanced accuracy. 6 cl, 13 dwg
