I've read the LockOn manual but i do not understand this passge (can't imagine)
Su-27 BVR - Scan mode:
"The expected target aspect hemisphere is controlled with the [Win-I] key. АВТ (ILV) mode can be used if the target aspect is unknown. The expected target aspect determines the pulse repetition frequency (PRF) to be used by the fighter radar in search mode. High PRF (HPRF), which provides the longest detection range against approaching forward-hemisphere targets, is indicated by ППС (HI), whereas medium PRF (MPRF) for receding rear-hemisphere targets is indicated by ЗПС (MED). In АВТ (ILV) mode, high and medium PRFs are interleaved on alternate bars of the radar scan pattern. This provides all-aspect target detection at the expense of a 25% reduction in maximum range"
What's "the expected target aspect hemisphere" or "expected target range" ?
ILV = Interleave mode ?
I don't understand these 2 phrases "against approaching forward-hemisphere targets" and "receding rear-hemisphere targets". Could anybody explain me this problem by drawing a diagram or smth like that ?
Thx