{"status":"ok","message-type":"work","message-version":"1.0.0","message":{"indexed":{"date-parts":[[2025,10,12]],"date-time":"2025-10-12T00:15:22Z","timestamp":1760228122278,"version":"build-2065373602"},"reference-count":31,"publisher":"MDPI AG","issue":"9","license":[{"start":{"date-parts":[[2022,5,6]],"date-time":"2022-05-06T00:00:00Z","timestamp":1651795200000},"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":["61675036","6140415020312","2017LBC006"],"award-info":[{"award-number":["61675036","6140415020312","2017LBC006"]}],"id":[{"id":"10.13039\/501100001809","id-type":"DOI","asserted-by":"publisher"}]},{"name":"13th Five-year Plan Equipment Pre-Research Fund","award":["61675036","6140415020312","2017LBC006"],"award-info":[{"award-number":["61675036","6140415020312","2017LBC006"]}]},{"DOI":"10.13039\/501100002367","name":"Chinese Academy of Sciences Key Laboratory of Beam Control Fund","doi-asserted-by":"publisher","award":["61675036","6140415020312","2017LBC006"],"award-info":[{"award-number":["61675036","6140415020312","2017LBC006"]}],"id":[{"id":"10.13039\/501100002367","id-type":"DOI","asserted-by":"publisher"}]}],"content-domain":{"domain":[],"crossmark-restriction":false},"short-container-title":["Remote Sensing"],"abstract":"<jats:p>The long-time coherent integration can effectively improve the detection ability of radar targets. However, this strategy usually shows poor effect in resisting the sea clutter, which produces difficulties for accurate estimation of sea clutter characteristics and results in the inability to differentiate between the target and sea clutter. To solve this problem, a two-stage method is proposed, which consists of the sea clutter suppression stage and target decision stage. In the sea clutter suppression stage, the correlation time differences in the time and the space domains are adopted to estimate the correlation of sea clutter. Then, a selective whitening filter is proposed, which is performed more adaptively according to the estimation results. In the decision stage, the peak average ratio in the fractional Fourier domain (FRFT-PAR) is presented, which can make better use of the energy accumulation characteristics and further suppress the interference of sea clutter. Experiments on the IPIX datasets with various observation times and polarization modes are included. The results indicate that the proposed method could not only effectively suppress sea clutter but also achieve better target detection performance than baseline algorithms.<\/jats:p>","DOI":"10.3390\/rs14092233","type":"journal-article","created":{"date-parts":[[2022,5,8]],"date-time":"2022-05-08T23:27:25Z","timestamp":1652052445000},"page":"2233","update-policy":"https:\/\/doi.org\/10.3390\/mdpi_crossmark_policy","source":"Crossref","is-referenced-by-count":2,"title":["Low Observable Radar Target Detection Method within Sea Clutter Based on Correlation Estimation"],"prefix":"10.3390","volume":"14","author":[{"ORCID":"https:\/\/orcid.org\/0000-0001-7385-411X","authenticated-orcid":false,"given":"Zefeng","family":"Luo","sequence":"first","affiliation":[{"name":"School of Microelectronics and Communication Engineering, Chongqing University, Chongqing 400044, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"ORCID":"https:\/\/orcid.org\/0000-0001-5275-1728","authenticated-orcid":false,"given":"Zhengzhou","family":"Li","sequence":"additional","affiliation":[{"name":"School of Microelectronics and Communication Engineering, Chongqing University, Chongqing 400044, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Chao","family":"Zhang","sequence":"additional","affiliation":[{"name":"School of Microelectronics and Communication Engineering, Chongqing University, Chongqing 400044, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Jiaqi","family":"Deng","sequence":"additional","affiliation":[{"name":"School of Microelectronics and Communication Engineering, Chongqing University, Chongqing 400044, China"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Tianqi","family":"Qin","sequence":"additional","affiliation":[{"name":"Sichuan Institute of Aerospace Electronic Equipment, Chengdu 610100, China"}],"role":[{"role":"author","vocabulary":"crossref"}]}],"member":"1968","published-online":{"date-parts":[[2022,5,6]]},"reference":[{"key":"ref_1","doi-asserted-by":"crossref","unstructured":"Ma, L., Wu, J., Zhang, J., Wu, Z., Jeon, G., Tian, M., and Zhang, Y. (2020). Sea Clutter Amplitude Prediction Using a Long Short-Term Memory Neural Network. Remote Sens., 11.","DOI":"10.3390\/rs11232826"},{"key":"ref_2","doi-asserted-by":"crossref","unstructured":"Liu, X., Xu, S., and Tang, S. (2020). CFAR Strategy Formulation and Evaluation Based on Fox\u2019s H-function in Positive Alpha-Stable Sea Clutter. Remote Sens., 12.","DOI":"10.3390\/rs12081273"},{"key":"ref_3","doi-asserted-by":"crossref","unstructured":"Yang, Z., Tang, J., Zhou, H., Xu, X., Tian, Y., and Wen, B. (2021). Joint Ship Detection Based on Time-Frequency Domain and CFAR Methods with HF Radar. Remote Sens., 13.","DOI":"10.3390\/rs13081548"},{"key":"ref_4","doi-asserted-by":"crossref","unstructured":"Chen, X., Guan, J., Mu, X., Wang, Z., Liu, N., and Wang, G. (2021). Multi-Dimensional Automatic Detection of Scanning Radar Images of Marine Targets Based on Radar PPInet. Remote Sens., 13.","DOI":"10.3390\/rs13193856"},{"key":"ref_5","doi-asserted-by":"crossref","unstructured":"Yan, H., Chen, C., Jin, G.D., Zhang, J., Wang, X., and Zhu, D. (2021). Implementation of a Modified Faster R-CNN for Target Detection Technology of Coastal Defense Radar. Remote Sens., 13.","DOI":"10.3390\/rs13091703"},{"key":"ref_6","doi-asserted-by":"crossref","first-page":"1","DOI":"10.1016\/j.sigpro.2018.09.017","article-title":"Radar Maneuvering Target Detection Based on Two Steps Scaling and Fractional Fourier Transform","volume":"155","author":"Fang","year":"2019","journal-title":"Signal Process."},{"key":"ref_7","first-page":"1017","article-title":"Radar Micro-Doppler Signature Extraction and Detection Via Short-Time Sparse Time-Frequency Distribution","volume":"39","author":"Chen","year":"2017","journal-title":"J. Electron. Inf. Technol."},{"key":"ref_8","doi-asserted-by":"crossref","first-page":"1002","DOI":"10.1109\/TGRS.2013.2246574","article-title":"Detection and Extraction of Target with Micromotion in Spiky Sea Clutter via Short-Time Fractional Fourier Transform","volume":"52","author":"Chen","year":"2014","journal-title":"IEEE Trans. Geosci. Remote Sens."},{"key":"ref_9","doi-asserted-by":"crossref","first-page":"6582","DOI":"10.1109\/TSP.2014.2366719","article-title":"Sparse Discrete Fractional Fourier Transform and Its Applications","volume":"62","author":"Liu","year":"2014","journal-title":"IEEE Trans. Signal Process."},{"key":"ref_10","doi-asserted-by":"crossref","first-page":"1186","DOI":"10.1109\/TAES.2011.5751251","article-title":"Radon-Fourier Transform for Radar Target Detection, I: Generalized Doppler Filter Bank","volume":"47","author":"Xu","year":"2011","journal-title":"IEEE Trans. Aerosp. Electron. Syst."},{"key":"ref_11","doi-asserted-by":"crossref","first-page":"2554","DOI":"10.1109\/TAES.2016.150076","article-title":"Hybrid Integration for Highly Maneuvering Radar Target Detection Based on Generalized Radon-Fourier Transform","volume":"52","author":"Xu","year":"2016","journal-title":"IEEE Trans. Aerosp. Electron. Syst."},{"key":"ref_12","doi-asserted-by":"crossref","first-page":"939","DOI":"10.1109\/TSP.2013.2297682","article-title":"Maneuvering Target Detection via Radon-Fractional Fourier Transform-Based Long-Time Coherent Integration","volume":"62","author":"Chen","year":"2014","journal-title":"IEEE Trans. Signal Process."},{"key":"ref_13","doi-asserted-by":"crossref","first-page":"1295","DOI":"10.1109\/LGRS.2013.2237750","article-title":"The Fractal Properties of Sea Clutter and Their Applications in Maritime Target Detection","volume":"10","author":"Luo","year":"2013","journal-title":"IEEE Geosci. Remote Sens. Lett."},{"key":"ref_14","doi-asserted-by":"crossref","first-page":"1547","DOI":"10.1109\/LGRS.2017.2721463","article-title":"Target Detection in Sea Clutter Based on Multifractal Characteristics after Empirical Mode Decomposition","volume":"14","author":"Li","year":"2017","journal-title":"IEEE Geosci. Remote Sens. Lett."},{"key":"ref_15","first-page":"635","article-title":"Detection of low observable moving target in sea clutter via fractal characteristics in fractional Fourier transform domain","volume":"7","author":"Chen","year":"2013","journal-title":"IET Radar"},{"key":"ref_16","first-page":"755","article-title":"Optimal Design of the Adaptive Normalized Matched Filter Detector Using Regularized Tyler Estimators","volume":"52","author":"Kammoun","year":"2015","journal-title":"IEEE Trans. Aerosp. Electron. Syst."},{"key":"ref_17","doi-asserted-by":"crossref","first-page":"2108","DOI":"10.1109\/TAES.2010.5595620","article-title":"Adaptive Detection Application of Covariance Matrix Estimator for Correlated Non-Gaussian Clutter","volume":"46","author":"He","year":"2010","journal-title":"IEEE Trans. Aerosp. Electron. Syst."},{"key":"ref_18","doi-asserted-by":"crossref","first-page":"1416","DOI":"10.1109\/TAES.2014.120657","article-title":"Tri-Feature-Based Detection of Floating Small Targets in Sea Clutter","volume":"50","author":"Shui","year":"2014","journal-title":"IEEE Trans. Aerosp. Electron. Syst."},{"key":"ref_19","doi-asserted-by":"crossref","first-page":"2360","DOI":"10.1007\/s00034-016-0413-5","article-title":"Combined Adaptive Normalized Matched Filter Detection of Moving Target in Sea Clutter","volume":"36","author":"Xu","year":"2017","journal-title":"Circuits Syst. Signal Process."},{"key":"ref_20","doi-asserted-by":"crossref","first-page":"4332","DOI":"10.1109\/TSP.2006.880248","article-title":"Signal decomposition by using the S-method with application to the analysis of HF radar signals in sea-clutter","volume":"54","author":"Stankovic","year":"2006","journal-title":"IEEE Trans. Signal Process."},{"key":"ref_21","doi-asserted-by":"crossref","first-page":"468","DOI":"10.1016\/j.sigpro.2017.08.001","article-title":"Time-frequency decomposition of multivariate multicomponent signals","volume":"142","author":"Stankovic","year":"2017","journal-title":"Signal Process."},{"key":"ref_22","doi-asserted-by":"crossref","first-page":"6307","DOI":"10.1109\/TSP.2013.2282274","article-title":"CFAR Detection of Range-Spread Targets Based on the Time-Frequency Decomposition Feature of Two Adjacent Returned Signals","volume":"61","author":"Zuo","year":"2013","journal-title":"IEEE Trans. Signal Process."},{"key":"ref_23","doi-asserted-by":"crossref","unstructured":"Lee, M., Kim, J., Ryu, B., and Kim, K.T. (2021). Robust Maritime Target Detector in Short Dwell Time. Remote Sens., 13.","DOI":"10.3390\/rs13071319"},{"key":"ref_24","doi-asserted-by":"crossref","first-page":"6395","DOI":"10.1109\/TGRS.2018.2838260","article-title":"Sea-Surface Floating Small Target Detection by One-Class Classifier in Time-Frequency Feature Space","volume":"56","author":"Shi","year":"2018","journal-title":"IEEE Trans. Geosci. Remote Sens."},{"key":"ref_25","first-page":"6829","article-title":"Analysis of Amplitude Statistical and Correlation Characteristics of High Grazing Angle Sea-Clutter","volume":"2019","author":"Liu","year":"2019","journal-title":"J. Eng.-Joe"},{"key":"ref_26","doi-asserted-by":"crossref","first-page":"3753","DOI":"10.1109\/TGRS.2018.2887092","article-title":"Cross Correlation Singularity Power Spectrum Theory and Application in Radar Target Detection within Sea Clutters","volume":"57","author":"Xiong","year":"2019","journal-title":"IEEE Trans. Geosci. Remote Sens."},{"key":"ref_27","doi-asserted-by":"crossref","first-page":"134","DOI":"10.26866\/jees.2021.21.2.134","article-title":"Sea Clutter Covariance Matrix Estimation and Its Application to Whitening Filter","volume":"21","author":"Choi","year":"2021","journal-title":"J. Electromagn. Eng. Sci."},{"key":"ref_28","doi-asserted-by":"crossref","first-page":"1269","DOI":"10.1109\/TAES.2018.2867699","article-title":"Loading Factor Estimation Under Affine Constraints on the Covariance Eigenvalues With Application to Radar Target Detection","volume":"55","author":"Pallotta","year":"2019","journal-title":"IEEE Trans. Aerosp. Electron. Syst."},{"key":"ref_29","doi-asserted-by":"crossref","first-page":"284","DOI":"10.1109\/JOE.2004.826901","article-title":"Mitigation Techniques for Non-Gaussian Sea Clutter","volume":"29","author":"Conte","year":"2004","journal-title":"IEEE J. Ocean. Eng."},{"key":"ref_30","doi-asserted-by":"crossref","first-page":"1502","DOI":"10.1109\/TAES.2010.5545205","article-title":"Impact of Sea Clutter Nonstationarity on Disturbance Covariance Matrix Estimation and CFAR Detector Performance","volume":"46","author":"Greco","year":"2010","journal-title":"IEEE Trans. Aerosp. Electron. Syst."},{"key":"ref_31","doi-asserted-by":"crossref","first-page":"1225","DOI":"10.1109\/LGRS.2019.2894385","article-title":"SVM-Based Sea-Surface Small Target Detection: A False-Alarm-Rate-Controllable Approach","volume":"16","author":"Li","year":"2019","journal-title":"IEEE Geosci. Remote Sens. 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