将电磁散射物理先验融入复数状态空间模型,提升极化雷达图像分类精度。
Physics-Aware Complex-Valued State Space Model with Scattering-Prior Feature Modulation for PolSAR Image Classification

- 在复数域构建状态空间模型,捕捉长程空间依赖关系。
- 用7类散射先验动态调制特征,提升区域一致性与边界保持能力。
- 适合需要物理可解释性的遥感图像分类研究者使用。
极化合成孔径雷达(PolSAR)图像分类是物理感知地理人工智能的典型任务,地表覆盖语义与电磁散射机制紧密相关。现有复数网络虽能保留幅度-相位信息,但普遍缺乏对长程空间依赖的建模能力,且仅将极化先验作为输入层或浅层辅助特征,导致物理知识未能有效引导深层特征演化。为此,本文提出CV-SSMNet:一种融合散射先验的物理感知复数状态空间网络。该方法在原始复数域构建复数状态空间模型(CV-SSM),以保留极化幅度-相位耦合的同时捕捉长程空间依赖;同时将7个物理意义明确的散射先验编码为FiLM风格调制信号,在特征演化过程中自适应重校准复数表示。CV-SSMNet还结合多尺度复数卷积、分支式CV-SSM编码、先验引导重校准及轻量级全局上下文聚合,实现从局部散射结构到全局空间上下文的物理引导表征学习。在三个L波段基准数据集和一个P波段BIOMASS数据集上的实验表明,CV-SSMNet在分类精度、区域一致性与边界保持方面均表现优异,验证了将极化散射机制嵌入复数长程地理表征学习的有效性。
原文摘要 · Abstract (English)
Polarimetric synthetic aperture radar (PolSAR) image classification is a representative task for physics-aware GeoAI, where land-cover semantics are closely coupled with electromagnetic scattering mechanisms. Many existing complex-valued networks can preserve amplitude-phase information, but they are often limited in long-range spatial dependency modeling and usually incorporate polarimetric priors only as input-level or shallow auxiliary features. As a result, physical knowledge is insufficiently used to guide deep feature evolution. To address this issue, this paper proposes CV-SSMNet, a physics-aware complex-valued state-space network with scattering-aware feature modulation for PolSAR image classification. The proposed method builds a complex-valued state-space model (CV-SSM) in the original complex domain to capture long-range spatial dependencies while preserving polarimetric amplitude-phase coupling. Meanwhile, seven physically meaningful scattering priors, are encoded as FiLM-style modulation signals to adaptively recalibrate complex-valued representations during feature evolution. CV-SSMNet further integrates multi-scale complex convolutions, branch-wise CV-SSM encoding, prior-guided recalibration, and lightweight global context aggregation, enabling physically guided representation learning from local scattering structures to global spatial context. Experiments on three L-band benchmark datasets and an additional P-band BIOMASS evaluation demonstrate that CV-SSMNet achieves competitive accuracy, improved regional consistency, and better boundary preservation, supporting the effectiveness of embedding polarimetric scattering mechanisms into complex-valued long-range GeoAI representation learning.
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