The VERA passive surveillance ESM system[1] (known as Věra in Czech) is an electronic support measures (ESM) system that uses measurements of time difference of arrival (TDOA) of pulses at three or four sites to accurately detect and track airborne emitters.

The system is generally line-of-sight limited, with a nominal range of 450 km, the normal radio horizon.

In addition, the shorter range VERA-P3D system is marketed for highly accurate monitoring of transponder-equipped ground vehicle movement at airports.

Czech company ERA in cooperation with the German SMAG introduced a brand new mobile antenna mast for its system VERA-NG.

Public domain literature claim VERA-E systems have been exported to Malaysia, Estonia, Pakistan and the United States.

[5] Newspaper reports also claimed that in January 2004 the Czech defence sales company, Omnipol, received licence to sell six systems to China.

Within the Czech Republic, a mobile VERA-E unit is operated by the 53rd Passive Radiotechnical Reconnaissance System and Electronic Warfare Centre at Planá near České Budějovice.