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Reference.org
VERA passive sensor
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<p>The VERA <a href="/facts/Passive_radar/F5qAPPXr">passive surveillance ESM system</a> is an <a href="/facts/Electronic_support_measures/ClAT0G7x">electronic support measures</a> (ESM) system that uses measurements of <a href="/facts/Time_difference_of_arrival/4UIdVk4Q">time difference of arrival</a> (TDOA) of pulses at three or four sites to accurately detect and track airborne emitters. The manufacturer is ERA a.s. [cz], based in <a href="/facts/Pardubice/xAIgQue1">Pardubice</a>. </p>