{"id":"https://openalex.org/W2048505474","doi":"https://doi.org/10.1109/icassp.2014.6854635","title":"A computationally efficient calibration algorithm for the LOFAR radio astronomical array","display_name":"A computationally efficient calibration algorithm for the LOFAR radio astronomical array","publication_year":2014,"publication_date":"2014-05-01","ids":{"openalex":"https://openalex.org/W2048505474","doi":"https://doi.org/10.1109/icassp.2014.6854635","mag":"2048505474"},"language":"en","primary_location":{"id":"doi:10.1109/icassp.2014.6854635","is_oa":false,"landing_page_url":"https://doi.org/10.1109/icassp.2014.6854635","pdf_url":null,"source":null,"license":null,"license_id":null,"version":"publishedVersion","is_accepted":true,"is_published":true,"raw_source_name":"2014 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP)","raw_type":"proceedings-article"},"type":"conference-paper","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/A5001831755","display_name":"Yuntao Wu","orcid":"https://orcid.org/0000-0001-7911-4104"},"institutions":[{"id":"https://openalex.org/I13955877","display_name":"Bar-Ilan University","ror":"https://ror.org/03kgsv495","country_code":"IL","type":"education","lineage":["https://openalex.org/I13955877"]}],"countries":["IL"],"is_corresponding":false,"raw_author_name":"Yuntao Wu","raw_affiliation_strings":["Faculty of Engineering, Bar-Ilan University, Ramat-Gan, Israel","Fac. of Eng., Bar Ilan Univ., Ramat Gan, Israel"],"raw_orcid":null,"affiliations":[{"raw_affiliation_string":"Faculty of Engineering, Bar-Ilan University, Ramat-Gan, Israel","institution_ids":["https://openalex.org/I13955877"]},{"raw_affiliation_string":"Fac. of Eng., Bar Ilan Univ., Ramat Gan, Israel","institution_ids":["https://openalex.org/I13955877"]}]},{"author_position":"middle","author":{"id":"https://openalex.org/A5019966334","display_name":"Amir Leshem","orcid":"https://orcid.org/0000-0002-2265-7463"},"institutions":[{"id":"https://openalex.org/I13955877","display_name":"Bar-Ilan University","ror":"https://ror.org/03kgsv495","country_code":"IL","type":"education","lineage":["https://openalex.org/I13955877"]}],"countries":["IL"],"is_corresponding":false,"raw_author_name":"Amir Leshem","raw_affiliation_strings":["Faculty of Engineering, Bar-Ilan University, Ramat-Gan, Israel","Fac. of Eng., Bar Ilan Univ., Ramat Gan, Israel"],"raw_orcid":null,"affiliations":[{"raw_affiliation_string":"Faculty of Engineering, Bar-Ilan University, Ramat-Gan, Israel","institution_ids":["https://openalex.org/I13955877"]},{"raw_affiliation_string":"Fac. of Eng., Bar Ilan Univ., Ramat Gan, Israel","institution_ids":["https://openalex.org/I13955877"]}]},{"author_position":"last","author":{"id":"https://openalex.org/A5033565717","display_name":"Stefan J. Wijnholds","orcid":"https://orcid.org/0000-0002-0463-3011"},"institutions":[{"id":"https://openalex.org/I922237871","display_name":"Netherlands Institute for Radio Astronomy","ror":"https://ror.org/000k1q888","country_code":"NL","type":"other","lineage":["https://openalex.org/I2800991832","https://openalex.org/I4405262988","https://openalex.org/I922237871"]}],"countries":["NL"],"is_corresponding":false,"raw_author_name":"Stefan J. Wijnholds","raw_affiliation_strings":["ASTRON, Dwingeloo, PD, The Netherlands","ASTRON, Dwingeloo, Netherlands"],"raw_orcid":null,"affiliations":[{"raw_affiliation_string":"ASTRON, Dwingeloo, PD, The Netherlands","institution_ids":["https://openalex.org/I922237871"]},{"raw_affiliation_string":"ASTRON, Dwingeloo, Netherlands","institution_ids":["https://openalex.org/I922237871"]}]}],"institutions":[],"countries_distinct_count":2,"institutions_distinct_count":2,"corresponding_author_ids":[],"corresponding_institution_ids":[],"apc_list":null,"apc_paid":null,"fwci":null,"has_fulltext":false,"cited_by_count":2,"citation_normalized_percentile":null,"cited_by_percentile_year":null,"biblio":{"volume":null,"issue":null,"first_page":"5402","last_page":"5406"},"is_retracted":false,"is_paratext":false,"is_xpac":false,"primary_topic":{"id":"https://openalex.org/T12450","display_name":"Radio Astronomy Observations and Technology","score":0.9995999932289124,"subfield":{"id":"https://openalex.org/subfields/3103","display_name":"Astronomy and Astrophysics"},"field":{"id":"https://openalex.org/fields/31","display_name":"Physics and Astronomy"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}},"topics":[{"id":"https://openalex.org/T12450","display_name":"Radio Astronomy Observations and Technology","score":0.9995999932289124,"subfield":{"id":"https://openalex.org/subfields/3103","display_name":"Astronomy and Astrophysics"},"field":{"id":"https://openalex.org/fields/31","display_name":"Physics and Astronomy"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}},{"id":"https://openalex.org/T10931","display_name":"Direction-of-Arrival Estimation Techniques","score":0.9980999827384949,"subfield":{"id":"https://openalex.org/subfields/1711","display_name":"Signal Processing"},"field":{"id":"https://openalex.org/fields/17","display_name":"Computer Science"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}},{"id":"https://openalex.org/T11946","display_name":"Antenna Design and Optimization","score":0.9944000244140625,"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"}}],"keywords":[{"id":"https://openalex.org/keywords/lofar","display_name":"LOFAR","score":0.9715865850448608},{"id":"https://openalex.org/keywords/algorithm","display_name":"Algorithm","score":0.6865332126617432},{"id":"https://openalex.org/keywords/estimator","display_name":"Estimator","score":0.6572424173355103},{"id":"https://openalex.org/keywords/calibration","display_name":"Calibration","score":0.592875599861145},{"id":"https://openalex.org/keywords/computer-science","display_name":"Computer science","score":0.5108551383018494},{"id":"https://openalex.org/keywords/subspace-topology","display_name":"Subspace topology","score":0.49434733390808105},{"id":"https://openalex.org/keywords/radio-telescope","display_name":"Radio telescope","score":0.47848838567733765},{"id":"https://openalex.org/keywords/covariance-matrix","display_name":"Covariance matrix","score":0.4439612925052643},{"id":"https://openalex.org/keywords/array-processing","display_name":"Array processing","score":0.4118020832538605},{"id":"https://openalex.org/keywords/mathematics","display_name":"Mathematics","score":0.27149268984794617},{"id":"https://openalex.org/keywords/statistics","display_name":"Statistics","score":0.24600017070770264},{"id":"https://openalex.org/keywords/physics","display_name":"Physics","score":0.243373841047287},{"id":"https://openalex.org/keywords/signal-processing","display_name":"Signal processing","score":0.22530007362365723},{"id":"https://openalex.org/keywords/telecommunications","display_name":"Telecommunications","score":0.13862162828445435},{"id":"https://openalex.org/keywords/astrophysics","display_name":"Astrophysics","score":0.11100605130195618},{"id":"https://openalex.org/keywords/artificial-intelligence","display_name":"Artificial intelligence","score":0.10037943720817566}],"concepts":[{"id":"https://openalex.org/C2780590096","wikidata":"https://www.wikidata.org/wiki/Q104528246","display_name":"LOFAR","level":3,"score":0.9715865850448608},{"id":"https://openalex.org/C11413529","wikidata":"https://www.wikidata.org/wiki/Q8366","display_name":"Algorithm","level":1,"score":0.6865332126617432},{"id":"https://openalex.org/C185429906","wikidata":"https://www.wikidata.org/wiki/Q1130160","display_name":"Estimator","level":2,"score":0.6572424173355103},{"id":"https://openalex.org/C165838908","wikidata":"https://www.wikidata.org/wiki/Q736777","display_name":"Calibration","level":2,"score":0.592875599861145},{"id":"https://openalex.org/C41008148","wikidata":"https://www.wikidata.org/wiki/Q21198","display_name":"Computer science","level":0,"score":0.5108551383018494},{"id":"https://openalex.org/C32834561","wikidata":"https://www.wikidata.org/wiki/Q660730","display_name":"Subspace topology","level":2,"score":0.49434733390808105},{"id":"https://openalex.org/C161813005","wikidata":"https://www.wikidata.org/wiki/Q184356","display_name":"Radio telescope","level":2,"score":0.47848838567733765},{"id":"https://openalex.org/C185142706","wikidata":"https://www.wikidata.org/wiki/Q1134404","display_name":"Covariance matrix","level":2,"score":0.4439612925052643},{"id":"https://openalex.org/C2778545087","wikidata":"https://www.wikidata.org/wiki/Q4795883","display_name":"Array processing","level":4,"score":0.4118020832538605},{"id":"https://openalex.org/C33923547","wikidata":"https://www.wikidata.org/wiki/Q395","display_name":"Mathematics","level":0,"score":0.27149268984794617},{"id":"https://openalex.org/C105795698","wikidata":"https://www.wikidata.org/wiki/Q12483","display_name":"Statistics","level":1,"score":0.24600017070770264},{"id":"https://openalex.org/C121332964","wikidata":"https://www.wikidata.org/wiki/Q413","display_name":"Physics","level":0,"score":0.243373841047287},{"id":"https://openalex.org/C104267543","wikidata":"https://www.wikidata.org/wiki/Q208163","display_name":"Signal processing","level":3,"score":0.22530007362365723},{"id":"https://openalex.org/C76155785","wikidata":"https://www.wikidata.org/wiki/Q418","display_name":"Telecommunications","level":1,"score":0.13862162828445435},{"id":"https://openalex.org/C44870925","wikidata":"https://www.wikidata.org/wiki/Q37547","display_name":"Astrophysics","level":1,"score":0.11100605130195618},{"id":"https://openalex.org/C154945302","wikidata":"https://www.wikidata.org/wiki/Q11660","display_name":"Artificial intelligence","level":1,"score":0.10037943720817566},{"id":"https://openalex.org/C554190296","wikidata":"https://www.wikidata.org/wiki/Q47528","display_name":"Radar","level":2,"score":0.0}],"mesh":[],"locations_count":1,"locations":[{"id":"doi:10.1109/icassp.2014.6854635","is_oa":false,"landing_page_url":"https://doi.org/10.1109/icassp.2014.6854635","pdf_url":null,"source":null,"license":null,"license_id":null,"version":"publishedVersion","is_accepted":true,"is_published":true,"raw_source_name":"2014 IEEE International Conference on Acoustics, Speech and Signal Processing (ICASSP)","raw_type":"proceedings-article"}],"best_oa_location":null,"sustainable_development_goals":[],"awards":[],"funders":[],"has_content":{"grobid_xml":false,"pdf":false},"content_urls":null,"referenced_works_count":25,"referenced_works":["https://openalex.org/W56309821","https://openalex.org/W1910115052","https://openalex.org/W2011569598","https://openalex.org/W2033862070","https://openalex.org/W2073819516","https://openalex.org/W2074115437","https://openalex.org/W2079243619","https://openalex.org/W2088744859","https://openalex.org/W2097610668","https://openalex.org/W2104738928","https://openalex.org/W2112169767","https://openalex.org/W2118435411","https://openalex.org/W2119883297","https://openalex.org/W2124677408","https://openalex.org/W2128571931","https://openalex.org/W2133261416","https://openalex.org/W2137181260","https://openalex.org/W2148604588","https://openalex.org/W2151517138","https://openalex.org/W2157374826","https://openalex.org/W2159472379","https://openalex.org/W2165369535","https://openalex.org/W2165941627","https://openalex.org/W3099391989","https://openalex.org/W3102932901"],"related_works":["https://openalex.org/W2006948930","https://openalex.org/W2894380952","https://openalex.org/W3163922883","https://openalex.org/W2754172574","https://openalex.org/W2036354294","https://openalex.org/W3126873820","https://openalex.org/W2096914795","https://openalex.org/W2115732854","https://openalex.org/W2157359579","https://openalex.org/W3135984056"],"abstract_inverted_index":{"In":[0],"this":[1],"paper,":[2],"the":[3,13,38,45,49,58,75,82,90,93,99,105,109,117,121,129,139,142,148,159,162],"problem":[4],"of":[5,48,57,74,81,92,103,120,141,161],"self-calibration":[6],"for":[7,88,157],"large":[8],"astronomical":[9],"arrays":[10],"such":[11],"as":[12],"Dutch":[14],"Low":[15],"Frequency":[16],"Array":[17],"(LOFAR)":[18],"is":[19,60,69,96,124,145,168],"considered.":[20],"We":[21],"assume":[22],"direction":[23],"dependent":[24],"gain":[25],"and":[26,34,41,79,98,108],"phase":[27],"errors":[28],"which":[29],"need":[30],"to":[31,62,128],"be":[32],"estimated":[33],"calibrated":[35],"out.":[36],"Combining":[37],"subspace":[39,47],"fitting":[40],"least":[42],"square":[43],"approaches,":[44],"signal":[46],"received":[50],"single":[51],"short-term":[52],"interval":[53],"(STI)":[54],"sample":[55],"data":[56],"LOFAR":[59,163],"used":[61],"build":[63],"a":[64,70,115,134],"cost":[65,94],"function":[66,95],"whose":[67],"minimizer":[68],"statistically":[71],"efficient":[72],"estimator":[73],"unknown":[76,100],"parameters-the":[77],"gains":[78],"phases":[80],"telescopes.":[83],"Subsequently,":[84],"an":[85],"iterative":[86],"algorithm":[87],"finding":[89],"minimum":[91],"presented":[97],"calibration":[101],"parameters":[102],"both":[104],"core":[106,160],"stations":[107],"external":[110],"subarray":[111],"are":[112],"separated.":[113],"As":[114],"result,":[116],"computational":[118],"complexity":[119],"proposed":[122,143],"method":[123,144,151],"significantly":[125],"reduced":[126],"compared":[127,146],"existing":[130],"methods":[131],"based":[132],"on":[133,165],"direct":[135],"covariance":[136],"fitting.":[137],"Finally,":[138],"performance":[140],"with":[147],"conventional":[149],"peeling":[150],"in":[152],"computer":[153],"simulation.":[154],"An":[155],"example":[156],"calibrating":[158],"array":[164],"Cyg":[166],"A":[167],"also":[169],"provided.":[170]},"counts_by_year":[{"year":2026,"cited_by_count":1},{"year":2020,"cited_by_count":1}],"updated_date":"2026-07-14T23:27:15.235271","created_date":"2025-10-10T00:00:00"}
