@Capt Kremin: Even
if JORN was operational, it would not necessarily have detected the aircraft. The factsheet says
OTHR systems operate on the Doppler principle, where an object will
only be detected if its motion toward or away from the radar is different from the movement of
its surroundings. Objects travelling tangentially to an OTHR are therefore unlikely to be
detected by that radar.
And also:
OTHRs do not continually ‘sweep’ an area like conventional radars but rather ‘dwell’ by focusing
the radar’s energy on a particular area – referred to as a ‘tile’ – within the total area of coverage