Russian term (edited): местные предметы

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ERAD 2002

Even at high elevation angles of the target, the sought signal can be concealed by reflections from local ground objects at the expense of the flank lobes of the antenna direction diagram. Neglecting these flank lobes, let us accept that the whole radiation is concentrated in the major lobe. Then, under the elevation angle of the target exceed-ing half of direction diagram width γ > θ/2, the whole an-tenna beam is located above the Earth surface, thus enabling to get rid of reflections from the local ground objects. It must be noted here that distant local ground objects cause no re-flection, since radar-tracking beam avoids the Earth surface because of its curvature. At the lowest position of antennaγ > θ/2 the minimum target height depends on its range