SIRIUS provides continuous passive horizon search against sea-skimming anti-ship missiles. This passive IR search system operates simultaneously in two wavelengths (3-5 μm and 8-12 μm) and provides long-range surveillance under all atmospheric conditions.
As a complementary sensor to the on-board surveillance radar equipment, SIRIUS ensures a most effective capability against threats with respect to the timely evaluation and decision for target engagements, especially under restricted EMCON conditions.