Abstract
At present, there are two main problems in the commonly used radar emitter identification methods. First, when the distribution of training data and testing data is quite different, the identification accuracy is low. Second, the traditional identification methods usually include an offline training stage and online identifying stage, which cannot achieve the real-time identification of the radar emitter. Aimed at the above problems, this paper proposes a radar emitter identification method based on transfer learning and online learning. First, for the case where the target domain contains only a small number of labeled samples, the TrAdaBoost method is used as the basic learning framework to train a support vector machine, which can obtain useful knowledge from the source domain to aid in the identification of the target domain. Then, for the case where the target domain does not contain labeled samples, the Expectation-Maximization algorithm is used to filter the unlabeled samples in the target domain to generate the available training data. Finally, to make the identification quickly and accurately, we propose a radar emitter identification method, based on online learning to ensure real-time updating of the model. Simulation experiments show that the proposed method, based on transfer learning and online learning, has higher identification accuracy and good timeliness.
Highlights
Radar emitter identification is the key link in radar reconnaissance
Simulation methods, we propose a radar emitter identification method based on online learning
The ideas of transfer learning and online learning are applied to the field of radar emitter identification
Summary
Radar emitter identification is the key link in radar reconnaissance. It extracts the characteristic parameters and working parameters on the basis of radar signal sorting. Based on these parameters, we can obtain information such as the system, use, type, and platform of the target radar, and further deduce the battlefield situation, threat level, activity rule, tactical intention, etc., and provide important intelligence support for its own decision-making [1]. The types of radar emitters are simple and the number is limited, so the above methods can solve the problem of radar emitter identification well. When the distribution of training data and testing data is quite different, the identification accuracy is low and the traditional identification methods are unable to respond effectively to an unknown radar emitter; second, the above identification methods usually adopt two stages of offline training and online identification, which make the model training and update speed slow, which cannot realize the real-time identification of the radar emitter
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