Abstract

Data-driven deep learning has been well applied in radar target detection. However, the performance of the detection network is severely degraded when the detection scene changes, since the trained network with the data from one scene is not suitable for another scene with different data distribution. In order to address this problem, an adaptive network detector combined with scene classification is proposed in this paper. Aiming at maximizing the posterior probability of the feature vectors, the scene classification network is arranged to control the output ratio of a group of detection sub-networks. Due to the uncertainty of classification error rate in traditional machine learning, the classifier with a controllable false alarm rate is constructed. In addition, a new network training strategy, which freezes the parameters of the scene classification network and selectively fine-tunes the parameters of detection sub-networks, is proposed for the adaptive network structure. Comprehensive experiments are carried out to demonstrate that the proposed method guarantees a high detection probability when the detection scene changes. Compared with some classical detectors, the adaptive network detector shows better performance.

Highlights

  • As the most basic task of radar signal processing, radar target detection is widely used in military and civil aviation activities

  • In order to address above problem, an adaptive network detector combined with scene classification is proposed in this paper

  • A new network training strategy, which freezes the parameters of the scene classification network and selectively fine-tunes the parameters of detection sub-networks, is devised for the network structure

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Summary

Introduction

As the most basic task of radar signal processing, radar target detection is widely used in military and civil aviation activities. Due to the complexity of clutter distribution, various methods can not match the clutter and target characteristics accurately, resulting in performance degradation. In this case, the different features of clutter and target are usually extracted to realize a binary classification, which is called feature detection technology. The different features of clutter and target are usually extracted to realize a binary classification, which is called feature detection technology These features usually include the radar echo amplitude, doppler spectrum, time-frequency map, polarization information, and other aspects [4,5,6,7,8]. According to the fractal feature of the sea clutter and the target, some detectors are proposed to gain a high performance [9,10,11]

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