“…At present, the low signal-to-noise ratio (SNR) infrared dim target detection is one of the core difficult problems of infrared search and track (IRST) systems, it always is the research hot spot and difficulty in this field [1][2]. As for IRST systems, the target is demand to possible earliest detect at a long distance (typically a few tens of kilometers or even hundreds of kilometers), since the influence of many factors such as complex battle environment, inhomogeneous atmospheric thermal radiation, internal noise of the detector, the target only about one or a few pixels in infrared images, the infrared radiation intensity is weak, so the SNR of the target is low, the target almost is submerged in clutter background, and sometimes even is lost, all these bring about great difficulties to dim target detection.…”