...雷达辐射源信号；时频分布 [gap=1252]s：modulation parameter estimation; multi-component LFM signals; Hough transform; radar emitter signals; Time-frequency distributions ..
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无监督学习是解决未知雷达辐射源信号识别的有效方法。
Unsupervised learning is a good method to solve the problem of recognition of unknown radar emitter signal.
对未知雷达辐射源信号进行准确分选是当前电子对抗领域迫需解决的一个难题。
It is a difficult problem to sorting unknown radar emitter in the electronic countermeasure field at present.
雷达辐射源信号识别是衡量雷达对抗设备技术先进程度的重要标志，是现代电子对抗领域急需解决的难题。
Recognition of radar emitter signals is an important symbol to measure the technical level of radar countermeasure in modern electronic countermeasure, besides, it is an urgent problem to solve.
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