 Low-flying military plane with countermeasure alert for hostile radar track acquisition can turn perpendicular to the hostile radar to nullify its Doppler frequency, which usually breaks the lock and drives the radar off by hiding against the ground return which is much larger.Doppler radar tends to be lightweight because it eliminates heavy pulse hardware.The associated filtering removes stationary reflections while integrating signals over a longer time span, which improves range performance while reducing power.