{"id":"https://openalex.org/W2171234155","doi":"https://doi.org/10.1109/lgrs.2011.2157889","title":"Internal Calibration for Stepped-Frequency Chirp SAR Imaging","display_name":"Internal Calibration for Stepped-Frequency Chirp SAR Imaging","publication_year":2011,"publication_date":"2011-06-29","ids":{"openalex":"https://openalex.org/W2171234155","doi":"https://doi.org/10.1109/lgrs.2011.2157889","mag":"2171234155"},"language":"en","primary_location":{"id":"doi:10.1109/lgrs.2011.2157889","is_oa":false,"landing_page_url":"https://doi.org/10.1109/lgrs.2011.2157889","pdf_url":null,"source":{"id":"https://openalex.org/S126920919","display_name":"IEEE Geoscience and Remote Sensing Letters","issn_l":"1545-598X","issn":["1545-598X","1558-0571"],"is_oa":false,"is_in_doaj":false,"is_core":true,"host_organization":"https://openalex.org/P4310319808","host_organization_name":"Institute of Electrical and Electronics Engineers","host_organization_lineage":["https://openalex.org/P4310319808"],"host_organization_lineage_names":["Institute of Electrical and Electronics Engineers"],"type":"journal"},"license":null,"license_id":null,"version":"publishedVersion","is_accepted":true,"is_published":true,"raw_source_name":"IEEE Geoscience and Remote Sensing Letters","raw_type":"journal-article"},"type":"article","indexed_in":["crossref"],"open_access":{"is_oa":false,"oa_status":"closed","oa_url":null,"any_repository_has_fulltext":false},"authorships":[{"author_position":"first","author":{"id":"https://openalex.org/A5108670723","display_name":"Yunkai Deng","orcid":null},"institutions":[{"id":"https://openalex.org/I19820366","display_name":"Chinese Academy of Sciences","ror":"https://ror.org/034t30j35","country_code":"CN","type":"funder","lineage":["https://openalex.org/I19820366"]},{"id":"https://openalex.org/I4210110458","display_name":"Institute of Electronics","ror":"https://ror.org/01z143507","country_code":"CN","type":"facility","lineage":["https://openalex.org/I19820366","https://openalex.org/I4210110458"]}],"countries":["CN"],"is_corresponding":true,"raw_author_name":"Yunkai Deng","raw_affiliation_strings":["Department of Space Microwave Remote Sensing System, Institute of Electronics, Chinese Academy of Sciences (CAS), Beijing, China"],"affiliations":[{"raw_affiliation_string":"Department of Space Microwave Remote Sensing System, Institute of Electronics, Chinese Academy of Sciences (CAS), Beijing, China","institution_ids":["https://openalex.org/I19820366","https://openalex.org/I4210110458"]}]},{"author_position":"middle","author":{"id":"https://openalex.org/A5101997040","display_name":"Huifang Zheng","orcid":"https://orcid.org/0000-0002-0683-8192"},"institutions":[{"id":"https://openalex.org/I4210165038","display_name":"University of Chinese Academy of Sciences","ror":"https://ror.org/05qbk4x57","country_code":"CN","type":"education","lineage":["https://openalex.org/I19820366","https://openalex.org/I4210165038"]},{"id":"https://openalex.org/I4210110458","display_name":"Institute of Electronics","ror":"https://ror.org/01z143507","country_code":"CN","type":"facility","lineage":["https://openalex.org/I19820366","https://openalex.org/I4210110458"]},{"id":"https://openalex.org/I19820366","display_name":"Chinese Academy of Sciences","ror":"https://ror.org/034t30j35","country_code":"CN","type":"funder","lineage":["https://openalex.org/I19820366"]}],"countries":["CN"],"is_corresponding":false,"raw_author_name":"Huifang Zheng","raw_affiliation_strings":["Graduate University of Chinese Academy of Sciences, Beijing, China","Institute of Electronics, Chinese Academy of Sciences (CAS), Beijing, China"],"affiliations":[{"raw_affiliation_string":"Graduate University of Chinese Academy of Sciences, Beijing, China","institution_ids":["https://openalex.org/I4210165038"]},{"raw_affiliation_string":"Institute of Electronics, Chinese Academy of Sciences (CAS), Beijing, China","institution_ids":["https://openalex.org/I4210110458","https://openalex.org/I19820366"]}]},{"author_position":"middle","author":{"id":"https://openalex.org/A5032677320","display_name":"Robert Wang","orcid":"https://orcid.org/0000-0002-9850-7015"},"institutions":[{"id":"https://openalex.org/I19820366","display_name":"Chinese Academy of Sciences","ror":"https://ror.org/034t30j35","country_code":"CN","type":"funder","lineage":["https://openalex.org/I19820366"]},{"id":"https://openalex.org/I4210110458","display_name":"Institute of Electronics","ror":"https://ror.org/01z143507","country_code":"CN","type":"facility","lineage":["https://openalex.org/I19820366","https://openalex.org/I4210110458"]}],"countries":["CN"],"is_corresponding":false,"raw_author_name":"Robert Wang","raw_affiliation_strings":["Department of Space Microwave Remote Sensing System, Institute of Electronics, Chinese Academy of Sciences (CAS), Beijing, China"],"affiliations":[{"raw_affiliation_string":"Department of Space Microwave Remote Sensing System, Institute of Electronics, Chinese Academy of Sciences (CAS), Beijing, China","institution_ids":["https://openalex.org/I19820366","https://openalex.org/I4210110458"]}]},{"author_position":"middle","author":{"id":"https://openalex.org/A5020108621","display_name":"Feng Jin","orcid":"https://orcid.org/0000-0002-9099-9318"},"institutions":[{"id":"https://openalex.org/I4210110458","display_name":"Institute of Electronics","ror":"https://ror.org/01z143507","country_code":"CN","type":"facility","lineage":["https://openalex.org/I19820366","https://openalex.org/I4210110458"]},{"id":"https://openalex.org/I19820366","display_name":"Chinese Academy of Sciences","ror":"https://ror.org/034t30j35","country_code":"CN","type":"funder","lineage":["https://openalex.org/I19820366"]}],"countries":["CN"],"is_corresponding":false,"raw_author_name":"Jin Feng","raw_affiliation_strings":["Department of Space Microwave Remote Sensing System, Institute of Electronics, Chinese Academy of Sciences (CAS), Beijing, China"],"affiliations":[{"raw_affiliation_string":"Department of Space Microwave Remote Sensing System, Institute of Electronics, Chinese Academy of Sciences (CAS), Beijing, China","institution_ids":["https://openalex.org/I19820366","https://openalex.org/I4210110458"]}]},{"author_position":"last","author":{"id":"https://openalex.org/A5100320038","display_name":"Yue Liu","orcid":"https://orcid.org/0000-0002-0092-7485"},"institutions":[{"id":"https://openalex.org/I4210110458","display_name":"Institute of Electronics","ror":"https://ror.org/01z143507","country_code":"CN","type":"facility","lineage":["https://openalex.org/I19820366","https://openalex.org/I4210110458"]},{"id":"https://openalex.org/I19820366","display_name":"Chinese Academy of Sciences","ror":"https://ror.org/034t30j35","country_code":"CN","type":"funder","lineage":["https://openalex.org/I19820366"]}],"countries":["CN"],"is_corresponding":false,"raw_author_name":"Yue Liu","raw_affiliation_strings":["Institute of Electronics, Chinese Academy of Sciences (CAS), Beijing, China"],"affiliations":[{"raw_affiliation_string":"Institute of Electronics, Chinese Academy of Sciences (CAS), Beijing, China","institution_ids":["https://openalex.org/I4210110458","https://openalex.org/I19820366"]}]}],"institutions":[],"countries_distinct_count":1,"institutions_distinct_count":5,"corresponding_author_ids":["https://openalex.org/A5108670723"],"corresponding_institution_ids":["https://openalex.org/I19820366","https://openalex.org/I4210110458"],"apc_list":null,"apc_paid":null,"fwci":8.559,"has_fulltext":false,"cited_by_count":51,"citation_normalized_percentile":{"value":0.97304551,"is_in_top_1_percent":false,"is_in_top_10_percent":true},"cited_by_percentile_year":{"min":89,"max":99},"biblio":{"volume":"8","issue":"6","first_page":"1105","last_page":"1109"},"is_retracted":false,"is_paratext":false,"is_xpac":false,"primary_topic":{"id":"https://openalex.org/T11038","display_name":"Advanced SAR Imaging Techniques","score":0.9998999834060669,"subfield":{"id":"https://openalex.org/subfields/2202","display_name":"Aerospace Engineering"},"field":{"id":"https://openalex.org/fields/22","display_name":"Engineering"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}},"topics":[{"id":"https://openalex.org/T11038","display_name":"Advanced SAR Imaging Techniques","score":0.9998999834060669,"subfield":{"id":"https://openalex.org/subfields/2202","display_name":"Aerospace Engineering"},"field":{"id":"https://openalex.org/fields/22","display_name":"Engineering"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}},{"id":"https://openalex.org/T10801","display_name":"Synthetic Aperture Radar (SAR) Applications and Techniques","score":0.9994999766349792,"subfield":{"id":"https://openalex.org/subfields/2202","display_name":"Aerospace Engineering"},"field":{"id":"https://openalex.org/fields/22","display_name":"Engineering"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}},{"id":"https://openalex.org/T11739","display_name":"Microwave Imaging and Scattering Analysis","score":0.9965000152587891,"subfield":{"id":"https://openalex.org/subfields/2204","display_name":"Biomedical Engineering"},"field":{"id":"https://openalex.org/fields/22","display_name":"Engineering"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}}],"keywords":[{"id":"https://openalex.org/keywords/chirp","display_name":"Chirp","score":0.7718779444694519},{"id":"https://openalex.org/keywords/synthetic-aperture-radar","display_name":"Synthetic aperture radar","score":0.7423402070999146},{"id":"https://openalex.org/keywords/bandwidth","display_name":"Bandwidth (computing)","score":0.63381427526474},{"id":"https://openalex.org/keywords/discontinuity","display_name":"Discontinuity (linguistics)","score":0.6320111155509949},{"id":"https://openalex.org/keywords/radar-imaging","display_name":"Radar imaging","score":0.6143171787261963},{"id":"https://openalex.org/keywords/wideband","display_name":"Wideband","score":0.5646998882293701},{"id":"https://openalex.org/keywords/computer-science","display_name":"Computer science","score":0.5468693375587463},{"id":"https://openalex.org/keywords/inverse-synthetic-aperture-radar","display_name":"Inverse synthetic aperture radar","score":0.5288867950439453},{"id":"https://openalex.org/keywords/amplitude","display_name":"Amplitude","score":0.4382099211215973},{"id":"https://openalex.org/keywords/acoustics","display_name":"Acoustics","score":0.4166772663593292},{"id":"https://openalex.org/keywords/optics","display_name":"Optics","score":0.36688166856765747},{"id":"https://openalex.org/keywords/radar","display_name":"Radar","score":0.35502204298973083},{"id":"https://openalex.org/keywords/telecommunications","display_name":"Telecommunications","score":0.23980838060379028},{"id":"https://openalex.org/keywords/physics","display_name":"Physics","score":0.20578286051750183},{"id":"https://openalex.org/keywords/artificial-intelligence","display_name":"Artificial intelligence","score":0.18735823035240173},{"id":"https://openalex.org/keywords/mathematics","display_name":"Mathematics","score":0.11541646718978882}],"concepts":[{"id":"https://openalex.org/C132794960","wikidata":"https://www.wikidata.org/wiki/Q27304","display_name":"Chirp","level":3,"score":0.7718779444694519},{"id":"https://openalex.org/C87360688","wikidata":"https://www.wikidata.org/wiki/Q740686","display_name":"Synthetic aperture radar","level":2,"score":0.7423402070999146},{"id":"https://openalex.org/C2776257435","wikidata":"https://www.wikidata.org/wiki/Q1576430","display_name":"Bandwidth (computing)","level":2,"score":0.63381427526474},{"id":"https://openalex.org/C2777042112","wikidata":"https://www.wikidata.org/wiki/Q5281658","display_name":"Discontinuity (linguistics)","level":2,"score":0.6320111155509949},{"id":"https://openalex.org/C10929652","wikidata":"https://www.wikidata.org/wiki/Q7279985","display_name":"Radar imaging","level":3,"score":0.6143171787261963},{"id":"https://openalex.org/C2780202535","wikidata":"https://www.wikidata.org/wiki/Q4524457","display_name":"Wideband","level":2,"score":0.5646998882293701},{"id":"https://openalex.org/C41008148","wikidata":"https://www.wikidata.org/wiki/Q21198","display_name":"Computer science","level":0,"score":0.5468693375587463},{"id":"https://openalex.org/C109094680","wikidata":"https://www.wikidata.org/wiki/Q6060432","display_name":"Inverse synthetic aperture radar","level":4,"score":0.5288867950439453},{"id":"https://openalex.org/C180205008","wikidata":"https://www.wikidata.org/wiki/Q159190","display_name":"Amplitude","level":2,"score":0.4382099211215973},{"id":"https://openalex.org/C24890656","wikidata":"https://www.wikidata.org/wiki/Q82811","display_name":"Acoustics","level":1,"score":0.4166772663593292},{"id":"https://openalex.org/C120665830","wikidata":"https://www.wikidata.org/wiki/Q14620","display_name":"Optics","level":1,"score":0.36688166856765747},{"id":"https://openalex.org/C554190296","wikidata":"https://www.wikidata.org/wiki/Q47528","display_name":"Radar","level":2,"score":0.35502204298973083},{"id":"https://openalex.org/C76155785","wikidata":"https://www.wikidata.org/wiki/Q418","display_name":"Telecommunications","level":1,"score":0.23980838060379028},{"id":"https://openalex.org/C121332964","wikidata":"https://www.wikidata.org/wiki/Q413","display_name":"Physics","level":0,"score":0.20578286051750183},{"id":"https://openalex.org/C154945302","wikidata":"https://www.wikidata.org/wiki/Q11660","display_name":"Artificial intelligence","level":1,"score":0.18735823035240173},{"id":"https://openalex.org/C33923547","wikidata":"https://www.wikidata.org/wiki/Q395","display_name":"Mathematics","level":0,"score":0.11541646718978882},{"id":"https://openalex.org/C134306372","wikidata":"https://www.wikidata.org/wiki/Q7754","display_name":"Mathematical analysis","level":1,"score":0.0},{"id":"https://openalex.org/C520434653","wikidata":"https://www.wikidata.org/wiki/Q38867","display_name":"Laser","level":2,"score":0.0}],"mesh":[],"locations_count":1,"locations":[{"id":"doi:10.1109/lgrs.2011.2157889","is_oa":false,"landing_page_url":"https://doi.org/10.1109/lgrs.2011.2157889","pdf_url":null,"source":{"id":"https://openalex.org/S126920919","display_name":"IEEE Geoscience and Remote Sensing Letters","issn_l":"1545-598X","issn":["1545-598X","1558-0571"],"is_oa":false,"is_in_doaj":false,"is_core":true,"host_organization":"https://openalex.org/P4310319808","host_organization_name":"Institute of Electrical and Electronics Engineers","host_organization_lineage":["https://openalex.org/P4310319808"],"host_organization_lineage_names":["Institute of Electrical and Electronics Engineers"],"type":"journal"},"license":null,"license_id":null,"version":"publishedVersion","is_accepted":true,"is_published":true,"raw_source_name":"IEEE Geoscience and Remote Sensing Letters","raw_type":"journal-article"}],"best_oa_location":null,"sustainable_development_goals":[{"display_name":"Affordable and clean energy","score":0.49000000953674316,"id":"https://metadata.un.org/sdg/7"}],"awards":[],"funders":[],"has_content":{"pdf":false,"grobid_xml":false},"content_urls":null,"referenced_works_count":11,"referenced_works":["https://openalex.org/W1516988621","https://openalex.org/W1829578299","https://openalex.org/W2010005407","https://openalex.org/W2114493720","https://openalex.org/W2115545510","https://openalex.org/W2127473125","https://openalex.org/W2142810222","https://openalex.org/W2152836515","https://openalex.org/W2154244004","https://openalex.org/W2991875935","https://openalex.org/W6770856196"],"related_works":["https://openalex.org/W2540450177","https://openalex.org/W2170580735","https://openalex.org/W1552305638","https://openalex.org/W2112228652","https://openalex.org/W1994788526","https://openalex.org/W1915418828","https://openalex.org/W2613451563","https://openalex.org/W1966299760","https://openalex.org/W2150075356","https://openalex.org/W2007886977"],"abstract_inverted_index":{"For":[0],"synthetic":[1],"aperture":[2],"radar":[3,34],"imaging,":[4],"stepped-frequency":[5,78],"chirp":[6],"signals":[7],"are":[8,103],"widely":[9],"used":[10],"to":[11,82,105],"obtain":[12],"high":[13],"range":[14,61,66],"resolution.":[15,67],"One":[16],"advantage":[17],"of":[18,24,32,40,92],"the":[19,22,25,33,38,44,56,60,65,84,89,93,107],"approach":[20],"is":[21,80],"reduction":[23],"instantaneous":[26],"bandwidth":[27],"and":[28,46,63,86,98],"sampling":[29],"rate":[30],"requirements":[31],"system.":[35],"To":[36],"reconstruct":[37],"spectrum":[39],"a":[41,71],"wideband":[42],"signal,":[43],"amplitude":[45],"phase":[47],"discontinuity":[48,57,85],"between":[49],"contiguous":[50],"pulses":[51],"should":[52],"be":[53],"removed.":[54],"Otherwise,":[55],"will":[58],"defocus":[59],"profile":[62],"degrade":[64],"In":[68],"this":[69],"letter,":[70],"detailed":[72],"internal":[73],"calibration":[74],"technique":[75],"combined":[76],"with":[77],"mode":[79],"proposed":[81,108],"eliminate":[83],"thus":[87],"improve":[88],"focusing":[90],"quality":[91],"final":[94],"image.":[95],"The":[96],"simulation":[97],"real":[99],"raw":[100],"data":[101],"experiments":[102],"performed":[104],"validate":[106],"method.":[109]},"counts_by_year":[{"year":2026,"cited_by_count":1},{"year":2024,"cited_by_count":7},{"year":2023,"cited_by_count":4},{"year":2022,"cited_by_count":2},{"year":2021,"cited_by_count":5},{"year":2020,"cited_by_count":1},{"year":2019,"cited_by_count":4},{"year":2018,"cited_by_count":4},{"year":2017,"cited_by_count":6},{"year":2016,"cited_by_count":5},{"year":2015,"cited_by_count":2},{"year":2014,"cited_by_count":6},{"year":2013,"cited_by_count":2},{"year":2012,"cited_by_count":2}],"updated_date":"2025-11-06T03:46:38.306776","created_date":"2025-10-10T00:00:00"}
