Passive Long-range ESM Surveillance System (PLESS) is a passive Over-The-Horizon (OTH) Direction Finding (DF) system developed by ERA. This direction finding system can detect, locate, identify and track air, land and naval targets with a focus on slow-moving or stationary platforms. The system processes signals from radars, jammers and datalinks emitting in a frequency band from 100 MHz to 18 GHz.
Using the unique passive detection technology by ERA, the PLESS direction finding system provides a covert mode of operation, ideal for long-term cross-border and maritime surveillance. Thanks to the utilization of tropospheric reflectivity properties, the PLESS direction finding system can see targets located even beyond the radio horizon.
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