Weak signal detection is a multidisciplinary application of detection methods, which through the use of different methods to study and analyze the statistical properties of signal and noise and use a variety of signal processing methods to analyze and process the input signal. Weak signals can be detected from strong noise to meet the requirements of modern scientific research and application of technology required for sophisticated detection technology. This paper describes the characteristics of weak signal detection and introduces the weak signal detection methods of linear and non-linear theory respectively. The emphasis is on comparing the current methods used in weak signal detection technology summarizing the characteristics of each method. Finally, is the development trend of weak signal detection.
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