{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,10,12]],"date-time":"2025-10-12T02:36:31Z","timestamp":1760236591822,"version":"build-2065373602"},"reference-count":33,"publisher":"MDPI AG","issue":"23","license":[{"start":{"date-parts":[[2021,12,5]],"date-time":"2021-12-05T00:00:00Z","timestamp":1638662400000},"content-version":"vor","delay-in-days":0,"URL":"https:\/\/creativecommons.org\/licenses\/by\/4.0\/"}],"funder":[{"DOI":"10.13039\/501100001809","name":"National Natural Science Foundation of China","doi-asserted-by":"publisher","award":["62001388","61701381","61627901"],"award-info":[{"award-number":["62001388","61701381","61627901"]}],"id":[{"id":"10.13039\/501100001809","id-type":"DOI","asserted-by":"publisher"}]},{"name":"Natural Science Basic Research Plan in Shaanxi Province of China","award":["2020JM-102"],"award-info":[{"award-number":["2020JM-102"]}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Remote Sensing"],"abstract":"<jats:p>The usage of a hypersonic platform for remote sensing application has promising prospects, especially for hypersonic platform-borne synthetic aperture radar (SAR) imaging. However, the high-speed of hypersonic platform will lead to extreme friction between the platform and air, which will cause the ionization of air. The ionized gas forms the plasma sheath wrapped around the hypersonic platform. The plasma sheath will severely affect the propagation of SAR signal and further affect the SAR imaging. Therefore, hypersonic platform-borne SAR imaging should be studied from a physical perspective. In this paper, hypersonic platform-borne SAR imaging under plasma sheath is analyzed. The SAR signal propagation in plasma sheath is computed using scatter matrix method. The proposed SAR signal model is verified by using a ground experiment system. Moreover, the effect of attenuation caused by plasma sheath on SAR imaging is studied under different SAR parameters and plasma sheath. The result shows that attenuation caused by plasma sheath will degrade the SAR imaging quality and even cause the point and area targets to be submerged into the noise. The real SAR images under plasma sheath also illustrate this phenomenon. Furthermore, by studying imaging results under different SAR and plasma parameters, it can be concluded that the severe degradation of SAR imaging quality appears at condition of high plasma sheath electron density and low SAR carrier frequency. The work in this paper will be beneficial for the study of hypersonic platform-borne SAR imaging and design of hypersonic SAR imaging systems in the future.<\/jats:p>","DOI":"10.3390\/rs13234943","type":"journal-article","created":{"date-parts":[[2021,12,6]],"date-time":"2021-12-06T03:10:38Z","timestamp":1638760238000},"page":"4943","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":4,"title":["Analysis of Hypersonic Platform-Borne SAR Imaging: A Physical Perspective"],"prefix":"10.3390","volume":"13","author":[{"given":"Lihao","family":"Song","sequence":"first","affiliation":[{"name":"School of Aerospace Science and Technology, Xidian University, Xi\u2019an 710071, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Bowen","family":"Bai","sequence":"additional","affiliation":[{"name":"School of Aerospace Science and Technology, Xidian University, Xi\u2019an 710071, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Xiaoping","family":"Li","sequence":"additional","affiliation":[{"name":"School of Aerospace Science and Technology, Xidian University, Xi\u2019an 710071, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Gezhao","family":"Niu","sequence":"additional","affiliation":[{"name":"School of Aerospace Science and Technology, Xidian University, Xi\u2019an 710071, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Yanming","family":"Liu","sequence":"additional","affiliation":[{"name":"School of Aerospace Science and Technology, Xidian University, Xi\u2019an 710071, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Liang","family":"Zhao","sequence":"additional","affiliation":[{"name":"Science and Technology on Space Physics Laboratory, Beijing 100076, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Hui","family":"Zhou","sequence":"additional","affiliation":[{"name":"School of Electrical & Electronic Engineering, Shandong University of Technology, Zibo 255000, China"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1968","published-online":{"date-parts":[[2021,12,5]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","first-page":"281","DOI":"10.1109\/TGRS.2019.2936246","article-title":"Focusing Hypersonic Vehicle-Borne SAR Data Using Radius\/Angle Algorithm","volume":"58","author":"Tang","year":"2019","journal-title":"IEEE Trans. Geosci. Remote Sens."},{"key":"ref_2","doi-asserted-by":"crossref","first-page":"31","DOI":"10.1016\/j.dsp.2017.05.007","article-title":"Moving-in-pulse duration model-based target integration method for HSV-borne high-resolution radar","volume":"68","author":"Xu","year":"2017","journal-title":"Digit. Signal Process."},{"key":"ref_3","doi-asserted-by":"crossref","unstructured":"Han, J., Cao, Y., Yeo, T.S., and Wang, F. (2021). Robust Clutter Suppression and Ground Moving Target Imaging Method for a Multichannel SAR with High-Squint Angle Mounted on Hypersonic Vehicle. Remote Sens., 13.","DOI":"10.3390\/rs13112051"},{"key":"ref_4","doi-asserted-by":"crossref","first-page":"108168","DOI":"10.1016\/j.sigpro.2021.108168","article-title":"A novel hypersonic vehicle-borne multichannel SAR-GMTI scheme based on adaptive sum and difference beams within eigenspace","volume":"187","author":"Han","year":"2021","journal-title":"Signal Process."},{"key":"ref_5","doi-asserted-by":"crossref","first-page":"909","DOI":"10.1049\/iet-spr.2017.0193","article-title":"Clutter suppression and GMTI for hypersonic vehicle borne SAR system with MIMO antenna","volume":"11","author":"Wang","year":"2017","journal-title":"IET Signal Process."},{"key":"ref_6","doi-asserted-by":"crossref","first-page":"133","DOI":"10.1038\/240133a0","article-title":"Hypersonic flight","volume":"240","author":"Stollery","year":"1972","journal-title":"Nature"},{"key":"ref_7","doi-asserted-by":"crossref","first-page":"426","DOI":"10.2514\/1.A32051","article-title":"Hypersonic Vehicle Telemetry Blackout Analysis","volume":"52","author":"Starkey","year":"2015","journal-title":"J. Spacecr. Rocket."},{"key":"ref_8","doi-asserted-by":"crossref","first-page":"7148","DOI":"10.1109\/TGRS.2019.2911952","article-title":"Two-Step Accuracy Improvement of Motion Compensation for Airborne SAR with Ultrahigh Resolution and Wide Swath","volume":"57","author":"Chen","year":"2019","journal-title":"IEEE Trans. Geosci. Remote Sens."},{"key":"ref_9","doi-asserted-by":"crossref","first-page":"1949","DOI":"10.1109\/TGRS.2018.2870299","article-title":"Background-Free Ground Moving Target Imaging for Multi-PRF Airborne SAR","volume":"57","author":"Jin","year":"2019","journal-title":"IEEE Trans. Geosci. Remote Sens."},{"key":"ref_10","doi-asserted-by":"crossref","unstructured":"Wei, X., Chong, J., Zhao, Y., Li, Y., and Yao, X. (2019). Airborne SAR Imaging Algorithm for Ocean Waves Based on Optimum Focus Setting. Remote Sens., 11.","DOI":"10.3390\/rs11050564"},{"key":"ref_11","doi-asserted-by":"crossref","first-page":"7436","DOI":"10.1109\/TGRS.2018.2852062","article-title":"A Modified Fixed-Point Chirp Scaling Algorithm Based on Updating Phase Factors Regionally for Spaceborne SAR Real-Time Imaging","volume":"56","author":"Ding","year":"2018","journal-title":"IEEE Trans. Geosci. Remote Sens."},{"key":"ref_12","doi-asserted-by":"crossref","unstructured":"Tian, J., Wu, Y., Cai, Y., Fan, H., and Yu, W. (2021). A Novel Mosaic Method for Spaceborne ScanSAR Images Based on Homography Matrix Compensation. Remote Sens., 13.","DOI":"10.3390\/rs13152866"},{"key":"ref_13","doi-asserted-by":"crossref","unstructured":"Wang, Y., Li, J., Yang, J., and Sun, B. (2017). A Novel Spaceborne Sliding Spotlight Range Sweep Synthetic Aperture Radar: System and Imaging. Remote Sens., 9.","DOI":"10.3390\/rs9080783"},{"key":"ref_14","doi-asserted-by":"crossref","unstructured":"Chen, Z., Zhou, Y., Zhang, L., Lin, C., Huang, Y., and Tang, S. (2018). Ground Moving Target Imaging and Analysis for Near-Space Hypersonic Vehicle-Borne Synthetic Aperture Radar System with Squint Angle. Remote Sens., 10.","DOI":"10.3390\/rs10121966"},{"key":"ref_15","doi-asserted-by":"crossref","first-page":"62","DOI":"10.1016\/j.dsp.2018.11.008","article-title":"Clutter suppression and ground moving target imaging approach for hypersonic vehicle borne multichannel radar based on two-step focusing method","volume":"85","author":"Wang","year":"2019","journal-title":"Digit. Signal Process."},{"key":"ref_16","doi-asserted-by":"crossref","first-page":"879","DOI":"10.1109\/TAES.1971.310328","article-title":"Progress in Reentry Communications","volume":"AES-7","author":"Rybak","year":"1971","journal-title":"IEEE Trans. Aerosp. Electron. Syst."},{"key":"ref_17","doi-asserted-by":"crossref","first-page":"151","DOI":"10.1016\/j.ast.2016.02.005","article-title":"Analysis of weakly ionized ablation plasma flows for a hypersonic vehicle","volume":"51","author":"Shao","year":"2016","journal-title":"Aerosp. Sci. Technol."},{"key":"ref_18","doi-asserted-by":"crossref","first-page":"023301","DOI":"10.1063\/1.4939700","article-title":"Re-entry communication through a plasma sheath using standing wave detection and adaptive data rate control","volume":"119","author":"Xie","year":"2016","journal-title":"J. Appl. Phys."},{"key":"ref_19","doi-asserted-by":"crossref","first-page":"2078","DOI":"10.1109\/LAWP.2017.2719164","article-title":"High-Order SO-DGTD Simulation of Radio Wave Propagation Through Inhomogeneous Weakly Ionized Dusty Plasma Sheath","volume":"16","author":"Li","year":"2017","journal-title":"IEEE Antennas Wirel. Propag. Lett."},{"key":"ref_20","doi-asserted-by":"crossref","first-page":"251","DOI":"10.1109\/TPS.2018.2872426","article-title":"Effects of Plasma Sheath on the Signal Detection of Narrowband Receiver","volume":"47","author":"Song","year":"2018","journal-title":"IEEE Trans. Plasma Sci."},{"key":"ref_21","doi-asserted-by":"crossref","first-page":"102104","DOI":"10.1063\/1.4998302","article-title":"Plasma sheath: An equivalent nonlinear mirror between electron density and transmitted electromagnetic signal","volume":"24","author":"Yao","year":"2017","journal-title":"Phys. Plasmas"},{"key":"ref_22","doi-asserted-by":"crossref","first-page":"4328","DOI":"10.1109\/TVT.2019.2902962","article-title":"A Geometric-Stochastic Integrated Channel Model for Hypersonic Vehicle: A Physical Perspective","volume":"68","author":"Yao","year":"2019","journal-title":"IEEE Trans. Veh. Technol."},{"key":"ref_23","doi-asserted-by":"crossref","first-page":"5940","DOI":"10.1109\/TAP.2017.2748231","article-title":"A 2-D FDTD Model for Analysis of Plane Wave Propagation Through the Reentry Plasma Sheath","volume":"65","author":"Zhang","year":"2017","journal-title":"IEEE Trans. Antennas Propag."},{"key":"ref_24","doi-asserted-by":"crossref","first-page":"3365","DOI":"10.1109\/TPS.2014.2349009","article-title":"Effects of Reentry Plasma Sheath on the Polarization Properties of Obliquely Incident EM Waves","volume":"42","author":"Bai","year":"2014","journal-title":"IEEE Trans. Plasma Sci."},{"key":"ref_25","doi-asserted-by":"crossref","first-page":"3147","DOI":"10.1109\/TPS.2015.2461546","article-title":"Effects of Pressure Variation on Polarization Properties of Obliquely Incident RF Waves in Re-Entry Plasma Sheath","volume":"43","author":"Liu","year":"2015","journal-title":"IEEE Trans. Plasma Sci."},{"key":"ref_26","doi-asserted-by":"crossref","first-page":"433","DOI":"10.1109\/LWC.2019.2957811","article-title":"A Joint Demodulation and Estimation Algorithm for Plasma Sheath Channel: Extract Principal Curves with Deep Learning","volume":"9","author":"Liu","year":"2019","journal-title":"IEEE Wirel. Commun. Lett."},{"key":"ref_27","doi-asserted-by":"crossref","first-page":"055110","DOI":"10.1063\/1.4950694","article-title":"Propagation of phase modulation signals in time-varying plasma","volume":"6","author":"Yang","year":"2016","journal-title":"AIP Adv."},{"key":"ref_28","doi-asserted-by":"crossref","first-page":"3166","DOI":"10.1109\/TPS.2017.2766786","article-title":"Study of the influence of time-varying plasma sheath on radar echo signal","volume":"45","author":"Chen","year":"2017","journal-title":"IEEE Trans. Plasma Sci."},{"key":"ref_29","doi-asserted-by":"crossref","first-page":"4103","DOI":"10.1109\/TPS.2020.3029590","article-title":"Method of Detecting a Target Enveloped by a Plasma Sheath Based on Doppler Frequency Compensation","volume":"48","author":"Ding","year":"2020","journal-title":"IEEE Trans. Plasma Sci."},{"key":"ref_30","doi-asserted-by":"crossref","unstructured":"Bian, Z., Li, J., and Guo, L. (2020). Simulation and Feature Extraction of the Dynamic Electromagnetic Scattering of a Hypersonic Vehicle Covered with Plasma Sheath. Remote Sens., 12.","DOI":"10.3390\/rs12172740"},{"key":"ref_31","first-page":"093515","article-title":"Analysis of the electromagnetic scattering characteristics in two-dimensional time-varying and spatially non-uniform plasma sheath","volume":"24","author":"Ren","year":"2019","journal-title":"Phys. Plasmas"},{"key":"ref_32","doi-asserted-by":"crossref","first-page":"2470","DOI":"10.1109\/TAP.2019.2891462","article-title":"Analyses of Electromagnetic Properties of a Hypersonic Object with Plasma Sheath","volume":"67","author":"Sha","year":"2019","journal-title":"IEEE Trans. Antennas Propag."},{"key":"ref_33","doi-asserted-by":"crossref","first-page":"4961","DOI":"10.1109\/TPS.2019.2945887","article-title":"Range Profile Analysis of Hypersonic Vehicles Covered by Inhomogeneous Plasma Sheath Using Physical Optics","volume":"47","author":"Zheng","year":"2019","journal-title":"IEEE Trans. Plasma Sci."}],"container-title":["Remote Sensing"],"original-title":[],"language":"en","link":[{"URL":"https:\/\/www.mdpi.com\/2072-4292\/13\/23\/4943\/pdf","content-type":"unspecified","content-version":"vor","intended-application":"similarity-checking"}],"deposited":{"date-parts":[[2025,10,11]],"date-time":"2025-10-11T07:39:55Z","timestamp":1760168395000},"score":1,"resource":{"primary":{"URL":"https:\/\/www.mdpi.com\/2072-4292\/13\/23\/4943"}},"subtitle":[],"short-title":[],"issued":{"date-parts":[[2021,12,5]]},"references-count":33,"journal-issue":{"issue":"23","published-online":{"date-parts":[[2021,12]]}},"alternative-id":["rs13234943"],"URL":"https:\/\/doi.org\/10.3390\/rs13234943","relation":{},"ISSN":["2072-4292"],"issn-type":[{"type":"electronic","value":"2072-4292"}],"subject":[],"published":{"date-parts":[[2021,12,5]]}}}