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The Electronic Surveillance Payload (ESP) is an ESM payload developed for UAV applications. The primary purpose of ESP is to provide the enemy Electronic Order of Battle (EOB) through emitter identification and location. It is designed to operate as a stand-alone ESM system integrated with UAV systems and is based on the Saab Emitter Location System (ELS) with an improved Probability Of Intercept (POI) for search radars.