A Few-Shot Open-Set Recognition Method for Radar Target HRRP Based on Multi-Hypersphere Spatial Topological Constraints

XU Hanzheng; LIU Zheng; XU Shuwen; GUO Zekun

doi:10.12263/DZXB.20250705

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A Few-Shot Open-Set Recognition Method for Radar Target HRRP Based on Multi-Hypersphere Spatial Topological Constraints

PAPERS | 更新时间：2026-06-16

- A Few-Shot Open-Set Recognition Method for Radar Target HRRP Based on Multi-Hypersphere Spatial Topological Constraints
- ACTA ELECTRONICA SINICA Vol. 54, Issue 3, Pages: 1209-1220(2026)
- 作者机构：
  
  西安电子科技大学雷达信号处理全国重点实验室，陕西西安 710071
- 作者简介：
- 基金信息：
  
  National Natural Science Foundation of China(62371382;U24A20217)
- DOI：10.12263/DZXB.20250705
  CLC： TN959.1+7;
- Received：14 August 2025，
  
  Accepted：04 March 2026，
  
  Published：25 March 2026
- 稿件说明：
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徐寒铮, 刘峥, 许述文, 等. 基于多球体空间拓扑约束的雷达目标HRRP少样本开集识别方法[J]. 电子学报, 2026, 54(03): 1209-1220.

XU Hanzheng, LIU Zheng, XU Shuwen, et al. A Few-Shot Open-Set Recognition Method for Radar Target HRRP Based on Multi-Hypersphere Spatial Topological Constraints[J]. Acta Electronica Sinica, 2026, 54(03): 1209-1220.
徐寒铮, 刘峥, 许述文, 等. 基于多球体空间拓扑约束的雷达目标HRRP少样本开集识别方法[J]. 电子学报, 2026, 54(03): 1209-1220. DOI：10.12263/DZXB.20250705

XU Hanzheng, LIU Zheng, XU Shuwen, et al. A Few-Shot Open-Set Recognition Method for Radar Target HRRP Based on Multi-Hypersphere Spatial Topological Constraints[J]. Acta Electronica Sinica, 2026, 54(03): 1209-1220. DOI：10.12263/DZXB.20250705

摘要

雷达目标高分辨距离像（High Resolution Range Profile，HRRP）因其能够有效表征目标的几何结构与电磁散射特性，在雷达目标识别领域具有重要的应用价值。近年来，深度学习方法凭借其强大的特征表征能力被广泛应用于HRRP目标识别任务。然而，现有基于深度学习的HRRP目标识别方法在少样本开集识别（Few-Shot Open-Set Recognition，FSOSR）场景中，其性能因训练样本少且本身不具备对未知类别的判别能力而受限。为此，本文提出一种基于多球体空间拓扑约束的雷达目标HRRP FSOSR方法。首先，在训练策略上引入元学习框架，从类别充足、样本丰富的辅助数据集采样大量相似且互不重复的任务作为训练单元，学习跨任务共通的知识，使模型在样本稀缺的任务数据集上具备快速泛化能力，缓解少样本模型过拟合问题；其次，在此基础上，设计适用于少样本场景的多球体决策边界建模机制，以超球体分别建模各已知类特征子空间，形成由多球体组成的已知类空间分布，从而隐式建模未知类分布；再次，在多球体之间引入自适应间隔，维持已知类间特定空间拓扑关系，提升决策边界的精细度和鲁棒性；最后，提出难分样本学习策略，先经难分挖掘筛选高价值样本，再借助样本对加权机制定量刻画样本难分程度，使模型依据权重进行针对性学习，从而利用高价值难分样本挖掘更精细的差异化特征，以增强模型对细粒度未知类判别能力。实验结果表明：该方法在5-shot及10-shot场景下，相较于现有方法，准确率分别提升6.17个百分点和2.94个百分点，AUROC指标分别提升13.1个百分点和12.94个百分点，验证了该方法的有效性与稳健性。此外，通过在瑞芯微RK3588嵌入式人工智能（Artificial Intelligence，AI）芯片上完成模型部署，所提方法推理时延2.197 ms，功耗为2.25 W，充分验证了该方法的工程可实现性。该方法适用于未知类频发的复杂场景，可支撑高分辨体制雷达对非合作目标的探测识别；同时，得益于良好的工程可实现性，该方法亦适用于机载平台等高实时性需求、硬件资源受限的应用场景。

Abstract

Radar target high-resolution range profile (HRRP) has significant application value in radar target recognition due to its ability to effectively characterize the geometric structure and electromagnetic scattering properties of targets. In recent years

deep learning methods have been widely applied to HRRP-based target recognition tasks owing to their powerful feature representation capability. However

existing deep learning-based radar target recognition methods using HRRP suffer from performance degradation in few-shot open-set recognition (FSOSR) scenarios due to limited training samples and inherent inability to discriminate unknown classes. To address this issue

this paper proposes a radar target HRRP few-shot open-set recognition method based on multi-hypersphere spatial topological constraints. First

a meta-learning framework is introduced in the training strategy. A large number of similar yet non-overlapping tasks are sampled from an auxiliary dataset with sufficient categories and abundant samples as training units to learn cross-task common knowledge

enabling the model to generalize rapidly on sample-scarce task datasets and alleviating few-shot overfitting. On this basis

a multi-hypersphere decision boundary modeling mechanism suitable for few-shot scenarios is designed. Each known class feature subspace is modeled by an individual hypersphere

forming a multi-hypersphere representation of the known-class feature space

which implicitly models the distribution of unknown classes. Meanwhile

adaptive margins are introduced between hyperspheres to maintain specific spatial topological relationships among known classes

thereby improving the refinement and robustness of the decision boundaries. Furthermore

a hard sample learning strategy is proposed. High-value samples are first selected through hard sample mining

after which a sample-wise weighting mechanism is employed to quantitatively characterize the hardness of samples. The model then performs targeted learning according to the assigned weights

enabling the extraction of finer discriminative features from informative hard samples and enhancing the model’s capability to distinguish fine-grained unknown classes. Experimental results demonstrate that

in the 5-shot and 10-shot scenarios

the proposed method achieves accuracy improvements of 6.17 percentage point and 2.94 percentage point

and AUROC improvements of 13.1 percentage point and 12.94 percentage point compared with the state-of-the-art methods

respectively

verifying the effectiveness and robustness of the proposed approach. In addition

the model is deployed on the Rockchip RK3588 embedded artificial intelligence (AI) chip

achieving an inference latency of 2.197 ms and a power consumption of 2.25 W

which demonstrates its engineering feasibility. The proposed method is suitable for complex environments where unknown classes frequently appear

and can support high-resolution radar systems in the detection and recognition of non-cooperative targets. Moreover

due to its favorable engineering feasibility

the method is also applicable to scenarios with stringent real-time requirements and limited hardware resources

such as airborne platforms.

关键词

Keywords

references

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