基于损失加权修正的舰船目标HRRP小样本元学习识别方法

Ship Target HRRP Meta-learning Recognition with Small Samples Based on Loss Weighted Correction

  • 摘要: 针对现有小样本高分辨距离像(high resolution range profile,HRRP)元学习识别方法难以适应任务经验差异的问题,提出了基于损失加权修正的舰船目标元学习识别方法。该方法以元学习理论为基础,设计了基础学习器与元学习器相结合的预训练模型。由于不同的特性损失可反映出学习经验的差异程度,故基于任务损失值对元学习器的损失函数进行加权处理,以减轻不同任务的偏差影响。然后,利用预训练模型对仿真数据的学习经验,在小样本测试任务集上进行舰船目标实测HRRP的分类识别。实验结果表明,所提方法与对比模型相比,可在小样本条件下获得更佳的识别效果,具备良好的小样本分类识别能力。

     

    Abstract: ‍ ‍Due to the decreasing recognition rate of the existing small sample recognition methods ignoring the different effects of various task experiences on new tasks, a meta-learning recognition method with small sample was proposed for high resolution range profile (HRRP) of ship targets, based on loss weighted correction. Based on the meta-learning theory, a pre-training model composed of a basic learner and a meta learner was designed. The characteristic loss of different tasks exhibits difference degrees of learning experience, hence the loss function of meta learner was weighted by the loss, to reduce the biased impact from different tasks. By using the learning experience of simulation data, resulted from the pre-training model, the recognition of measured HRRP was carried out for ship targets, on a small sample test task set. Experimental results show that, the proposed method outperforms the existing contrastive models, especially in the case of smaller samples, in the view of classification and recognition abilities.

     

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