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An Infrared Search and Track (IRST) system detects and tracks objects that emit infrared radiation, such as the infrared signatures of jet aircraft and helicopters. Some naval surface vessels, such as the Istanbul-class frigate, are also equipped with IRST.
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Search interest data over the past 12 months indicates that this topic periodically attracts global attention. Sudden spikes often correlate with major news events, public statements, or geopolitical developments.