Side-Lobe Blanking In Doppler-Domain For An Airborne Side-Looking Phased Array PD Radar

For airborne PD Radar, some strong side-lobe clutter would be detected as targets, because the Doppler shift of the side-lobe clutter is different from the Doppler shift of main-beam clutter when the angle between the side-lobe clutter scatter and the main-beam direction is over some value. However, when we filter the main-beam clutter with Doppler filter, the side-lobe clutter would be remained and then be detected as targets. These side-lobe false alarms shows an equal-range ring on radar display. This paper discusses a Side-Lobe Blanking (SLB) method in Doppler-domain, which compares the Doppler filter output amplitude of Σ channel with that of auxiliary channel, if Σ channel is smaller, it's a side-lobe false alarm, blank it. Practical results shows effectiveness.