Radar radiation identification suffer from the problem that the existing identification method can not process radar radiation data streams which does not in the database. In this paper, in order to solve the problem, we first introduce Online Transfer Learning (OTL) into radar radiation identification field. OTL is a machine learning framework, which aims to attack an online learning task by transferring knowledge from some source domain to a target domain. By extending binary classification online transfer learning to multiple classification tasks, we then consider the problem of training multiple classification online transfer learning using radar radiation data streams. Finally, the simulation results validate the efficacy of radar radiation identification based on online transfer learning techniques.
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