The essence of air defence is to detect hostile aircraft and destroy them. The critical issue is to hit a target moving in three-dimensional space; an attack must not only match these three coordinates, but must do so at the time the target is at that position. This means that projectiles either have to be guided to hit the target, or aimed at the predicted position of the target at the time the projectile reaches it, taking into account speed and direction of both the target and the projectile. COUNT 5
QSN1 What is the first purpose of air defence? ANS1 detect hostile aircraft QSN2 What is the second purpose of air defence? ANS2 destroy them QSN3 What is the critical issue in air defence? ANS3 to hit a target moving in three-dimensional space QSN4 Projectiles must either be guided to the target or aimed where? ANS4 at the predicted position of the target at the time the projectile reaches it QSN5 What two things must be considered in regards to the projectile and target? ANS5 speed and direction