Exploited Emitters
The current generation sensor can only detect and track pulsed emissions, due to the requirement to measure the time of arrival of pulses. The receivers operate in the frequency range of 1-18 GHz and typically exploit secondary surveillance radar (SSR) transponders, identify friend or foe (IFF) transponders, airborne radars, weather radars, tactical air navigation (TACAN) transponders, distance measurement equipment (DME) beacons, digital communications signals and pulsed jamming signals.
Read more about this topic: VERA Passive Sensor
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—C. John Sommerville (20th century)