{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2026,7,27]],"date-time":"2026-07-27T12:07:15Z","timestamp":1785154035767,"version":"3.55.0"},"reference-count":60,"publisher":"MDPI AG","issue":"15","license":[{"start":{"date-parts":[[2026,7,27]],"date-time":"2026-07-27T00:00:00Z","timestamp":1785110400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"name":"Defense Industrial Technology Development Program","award":["JCKY2024530C008"],"award-info":[{"award-number":["JCKY2024530C008"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Sensors"],"abstract":"<jats:p>Segmenting key components of space targets using Inverse Synthetic Aperture Radar (ISAR) images is an important interpretation task in space situational awareness. However, the scarcity of pixel-level annotated data, inter-class confusion caused by morphological differences among multiple target classes, and the absence of structural priors for components restrict the performance improvement in existing deep models on this task. Therefore, this paper proposes a Semi-Supervised Structural Prior-Guided Network (SSPNet). First, a Gated Manifold-Constrained Hyper-Connections Vision Transformer (GMHC-ViT) encoder is proposed to broaden the feature representation space via parallel multi-feature streams with adaptive gating, thereby alleviating inter-class confusion and enhancing cross-category generalization. Second, a Prior-Guided Module (PGM) is proposed to extract shape and edge priors of components, and it adaptively enhances the weakly activated channels of encoder features through cross-attention, thereby injecting structural knowledge independent of image quality into the segmentation process. Furthermore, to effectively leverage large amounts of unlabeled data, a strong perturbation strategy tailored to the characteristics of ISAR images is designed for consistency regularization. Experimental results on a simulated ISAR dataset containing 38 classes of space targets demonstrate that SSPNet outperforms existing methods and exhibits strong segmentation capability even under low signal-to-noise ratio (SNR) conditions.<\/jats:p>","DOI":"10.3390\/s26154769","type":"journal-article","created":{"date-parts":[[2026,7,27]],"date-time":"2026-07-27T11:54:26Z","timestamp":1785153266000},"page":"4769","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":0,"title":["Semi-Supervised Structural Prior-Guided Network for Space Target Component Segmentation in ISAR Images"],"prefix":"10.3390","volume":"26","author":[{"given":"Yonghua","family":"He","sequence":"first","affiliation":[{"name":"Space Engineering University, Beijing 101400, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Aoxiang","family":"Pan","sequence":"additional","affiliation":[{"name":"Space Engineering University, Beijing 101400, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Yonggang","family":"Li","sequence":"additional","affiliation":[{"name":"Space Engineering University, Beijing 101400, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Jiahao","family":"Wang","sequence":"additional","affiliation":[{"name":"Space Engineering University, Beijing 101400, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Wei","family":"Qu","sequence":"additional","affiliation":[{"name":"Space Engineering University, Beijing 101400, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Weigang","family":"Zhu","sequence":"additional","affiliation":[{"name":"Space Engineering University, Beijing 101400, China"}],"role":[{"vocabulary":"crossref","role":"author"}]},{"given":"Wenhang","family":"Ji","sequence":"additional","affiliation":[{"name":"Space Engineering University, Beijing 101400, China"}],"role":[{"vocabulary":"crossref","role":"author"}]}],"member":"1968","published-online":{"date-parts":[[2026,7,27]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"506","DOI":"10.1109\/TAES.2023.3326791","article-title":"Semisupervised Space Target Recognition Algorithm Based on Integrated Network of Imaging and Recognition in Radar Signal Domain","volume":"60","author":"Li","year":"2024","journal-title":"IEEE Trans. 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