{"id":"https://openalex.org/W3090170783","doi":"https://doi.org/10.1109/access.2020.3024920","title":"Performance Evaluation of Adjusted Spherical Harmonics Ionospheric Model Over Indian Region","display_name":"Performance Evaluation of Adjusted Spherical Harmonics Ionospheric Model Over Indian Region","publication_year":2020,"publication_date":"2020-01-01","ids":{"openalex":"https://openalex.org/W3090170783","doi":"https://doi.org/10.1109/access.2020.3024920","mag":"3090170783"},"language":"en","primary_location":{"id":"doi:10.1109/access.2020.3024920","is_oa":true,"landing_page_url":"https://doi.org/10.1109/access.2020.3024920","pdf_url":"https://ieeexplore.ieee.org/ielx7/6287639/8948470/09199900.pdf","source":{"id":"https://openalex.org/S2485537415","display_name":"IEEE Access","issn_l":"2169-3536","issn":["2169-3536"],"is_oa":true,"is_in_doaj":true,"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":"cc-by","license_id":"https://openalex.org/licenses/cc-by","version":"publishedVersion","is_accepted":true,"is_published":true,"raw_source_name":"IEEE Access","raw_type":"journal-article"},"type":"article","indexed_in":["crossref","doaj"],"open_access":{"is_oa":true,"oa_status":"gold","oa_url":"https://ieeexplore.ieee.org/ielx7/6287639/8948470/09199900.pdf","any_repository_has_fulltext":true},"authorships":[{"author_position":"first","author":{"id":null,"display_name":"Kondaveeti Siva Krishna","orcid":"https://orcid.org/0000-0001-5812-846X"},"institutions":[{"id":"https://openalex.org/I875944469","display_name":"Koneru Lakshmaiah Education Foundation","ror":"https://ror.org/02k949197","country_code":"IN","type":"education","lineage":["https://openalex.org/I875944469"]}],"countries":["IN"],"is_corresponding":false,"raw_author_name":"Kondaveeti Siva Krishna","raw_affiliation_strings":["Koneru Lakshmaiah Education Foundation, Vaddeswaram, India"],"raw_orcid":"https://orcid.org/0000-0001-5812-846X","affiliations":[{"raw_affiliation_string":"Koneru Lakshmaiah Education Foundation, Vaddeswaram, India","institution_ids":["https://openalex.org/I875944469"]}]},{"author_position":"middle","author":{"id":null,"display_name":"Devanaboyina Venkata Ratnam","orcid":"https://orcid.org/0000-0003-2222-2117"},"institutions":[{"id":"https://openalex.org/I875944469","display_name":"Koneru Lakshmaiah Education Foundation","ror":"https://ror.org/02k949197","country_code":"IN","type":"education","lineage":["https://openalex.org/I875944469"]}],"countries":["IN"],"is_corresponding":false,"raw_author_name":"Devanaboyina Venkata Ratnam","raw_affiliation_strings":["Koneru Lakshmaiah Education Foundation, Vaddeswaram, India"],"raw_orcid":"https://orcid.org/0000-0003-2222-2117","affiliations":[{"raw_affiliation_string":"Koneru Lakshmaiah Education Foundation, Vaddeswaram, India","institution_ids":["https://openalex.org/I875944469"]}]},{"author_position":"middle","author":{"id":"https://openalex.org/A5070270424","display_name":"M. Sridhar","orcid":"https://orcid.org/0000-0002-3633-848X"},"institutions":[{"id":"https://openalex.org/I875944469","display_name":"Koneru Lakshmaiah Education Foundation","ror":"https://ror.org/02k949197","country_code":"IN","type":"education","lineage":["https://openalex.org/I875944469"]}],"countries":["IN"],"is_corresponding":false,"raw_author_name":"Miriyala Sridhar","raw_affiliation_strings":["Koneru Lakshmaiah Education Foundation, Vaddeswaram, India"],"raw_orcid":"https://orcid.org/0000-0002-3633-848X","affiliations":[{"raw_affiliation_string":"Koneru Lakshmaiah Education Foundation, Vaddeswaram, India","institution_ids":["https://openalex.org/I875944469"]}]},{"author_position":"middle","author":{"id":"https://openalex.org/A5069619976","display_name":"P. Babu Sree Harsha","orcid":"https://orcid.org/0000-0002-6717-4078"},"institutions":[{"id":"https://openalex.org/I875944469","display_name":"Koneru Lakshmaiah Education Foundation","ror":"https://ror.org/02k949197","country_code":"IN","type":"education","lineage":["https://openalex.org/I875944469"]}],"countries":["IN"],"is_corresponding":false,"raw_author_name":"P. Babu Sree Harsha","raw_affiliation_strings":["Koneru Lakshmaiah Education Foundation, Vaddeswaram, India"],"raw_orcid":null,"affiliations":[{"raw_affiliation_string":"Koneru Lakshmaiah Education Foundation, Vaddeswaram, India","institution_ids":["https://openalex.org/I875944469"]}]},{"author_position":"last","author":{"id":"https://openalex.org/A5037052967","display_name":"G. Sivavaraprasad","orcid":"https://orcid.org/0000-0002-8390-3488"},"institutions":[{"id":"https://openalex.org/I875944469","display_name":"Koneru Lakshmaiah Education Foundation","ror":"https://ror.org/02k949197","country_code":"IN","type":"education","lineage":["https://openalex.org/I875944469"]}],"countries":["IN"],"is_corresponding":false,"raw_author_name":"Gampala Sivavaraprasad","raw_affiliation_strings":["Koneru Lakshmaiah Education Foundation, Vaddeswaram, India"],"raw_orcid":"https://orcid.org/0000-0002-8390-3488","affiliations":[{"raw_affiliation_string":"Koneru Lakshmaiah Education Foundation, Vaddeswaram, India","institution_ids":["https://openalex.org/I875944469"]}]}],"institutions":[],"countries_distinct_count":1,"institutions_distinct_count":5,"corresponding_author_ids":[],"corresponding_institution_ids":[],"apc_list":{"value":1850,"currency":"USD","value_usd":1850},"apc_paid":{"value":1850,"currency":"USD","value_usd":1850},"fwci":11.4206,"has_fulltext":true,"cited_by_count":8,"citation_normalized_percentile":{"value":0.97845589,"is_in_top_1_percent":false,"is_in_top_10_percent":true},"cited_by_percentile_year":{"min":90,"max":98},"biblio":{"volume":"8","issue":null,"first_page":"172610","last_page":"172622"},"is_retracted":false,"is_paratext":false,"is_xpac":false,"primary_topic":{"id":"https://openalex.org/T10655","display_name":"GNSS positioning and interference","score":1.0,"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/T10655","display_name":"GNSS positioning and interference","score":1.0,"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/T10159","display_name":"Ionosphere and magnetosphere dynamics","score":0.9998999834060669,"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/T11405","display_name":"Geophysics and Gravity Measurements","score":0.9994999766349792,"subfield":{"id":"https://openalex.org/subfields/1910","display_name":"Oceanography"},"field":{"id":"https://openalex.org/fields/19","display_name":"Earth and Planetary Sciences"},"domain":{"id":"https://openalex.org/domains/3","display_name":"Physical Sciences"}}],"keywords":[{"id":"https://openalex.org/keywords/ionosphere","display_name":"Ionosphere","score":0.7968249320983887},{"id":"https://openalex.org/keywords/tec","display_name":"TEC","score":0.740420937538147},{"id":"https://openalex.org/keywords/gnss-applications","display_name":"GNSS applications","score":0.7032462358474731},{"id":"https://openalex.org/keywords/computer-science","display_name":"Computer science","score":0.5225191116333008},{"id":"https://openalex.org/keywords/space-weather","display_name":"Space weather","score":0.5020473003387451},{"id":"https://openalex.org/keywords/international-reference-ionosphere","display_name":"International Reference Ionosphere","score":0.4855186939239502},{"id":"https://openalex.org/keywords/global-positioning-system","display_name":"Global Positioning System","score":0.4770568907260895},{"id":"https://openalex.org/keywords/satellite","display_name":"Satellite","score":0.4553854465484619},{"id":"https://openalex.org/keywords/satellite-system","display_name":"Satellite system","score":0.4407666027545929},{"id":"https://openalex.org/keywords/spherical-harmonics","display_name":"Spherical harmonics","score":0.4191143214702606},{"id":"https://openalex.org/keywords/geodesy","display_name":"Geodesy","score":0.4128059148788452},{"id":"https://openalex.org/keywords/remote-sensing","display_name":"Remote sensing","score":0.39814430475234985},{"id":"https://openalex.org/keywords/algorithm","display_name":"Algorithm","score":0.34242916107177734},{"id":"https://openalex.org/keywords/geology","display_name":"Geology","score":0.3280091881752014},{"id":"https://openalex.org/keywords/total-electron-content","display_name":"Total electron content","score":0.3126601278781891},{"id":"https://openalex.org/keywords/meteorology","display_name":"Meteorology","score":0.30915018916130066},{"id":"https://openalex.org/keywords/physics","display_name":"Physics","score":0.242739737033844},{"id":"https://openalex.org/keywords/geophysics","display_name":"Geophysics","score":0.2128409743309021},{"id":"https://openalex.org/keywords/telecommunications","display_name":"Telecommunications","score":0.16526958346366882},{"id":"https://openalex.org/keywords/astronomy","display_name":"Astronomy","score":0.10212922096252441}],"concepts":[{"id":"https://openalex.org/C116403925","wikidata":"https://www.wikidata.org/wiki/Q162219","display_name":"Ionosphere","level":2,"score":0.7968249320983887},{"id":"https://openalex.org/C176379880","wikidata":"https://www.wikidata.org/wiki/Q18031939","display_name":"TEC","level":3,"score":0.740420937538147},{"id":"https://openalex.org/C14279187","wikidata":"https://www.wikidata.org/wiki/Q5514012","display_name":"GNSS applications","level":3,"score":0.7032462358474731},{"id":"https://openalex.org/C41008148","wikidata":"https://www.wikidata.org/wiki/Q21198","display_name":"Computer science","level":0,"score":0.5225191116333008},{"id":"https://openalex.org/C151325931","wikidata":"https://www.wikidata.org/wiki/Q584093","display_name":"Space weather","level":2,"score":0.5020473003387451},{"id":"https://openalex.org/C2777966019","wikidata":"https://www.wikidata.org/wiki/Q1666845","display_name":"International Reference Ionosphere","level":5,"score":0.4855186939239502},{"id":"https://openalex.org/C60229501","wikidata":"https://www.wikidata.org/wiki/Q18822","display_name":"Global Positioning System","level":2,"score":0.4770568907260895},{"id":"https://openalex.org/C19269812","wikidata":"https://www.wikidata.org/wiki/Q26540","display_name":"Satellite","level":2,"score":0.4553854465484619},{"id":"https://openalex.org/C2778027091","wikidata":"https://www.wikidata.org/wiki/Q25346003","display_name":"Satellite system","level":4,"score":0.4407666027545929},{"id":"https://openalex.org/C3768446","wikidata":"https://www.wikidata.org/wiki/Q877100","display_name":"Spherical harmonics","level":2,"score":0.4191143214702606},{"id":"https://openalex.org/C13280743","wikidata":"https://www.wikidata.org/wiki/Q131089","display_name":"Geodesy","level":1,"score":0.4128059148788452},{"id":"https://openalex.org/C62649853","wikidata":"https://www.wikidata.org/wiki/Q199687","display_name":"Remote sensing","level":1,"score":0.39814430475234985},{"id":"https://openalex.org/C11413529","wikidata":"https://www.wikidata.org/wiki/Q8366","display_name":"Algorithm","level":1,"score":0.34242916107177734},{"id":"https://openalex.org/C127313418","wikidata":"https://www.wikidata.org/wiki/Q1069","display_name":"Geology","level":0,"score":0.3280091881752014},{"id":"https://openalex.org/C165391973","wikidata":"https://www.wikidata.org/wiki/Q844304","display_name":"Total electron content","level":4,"score":0.3126601278781891},{"id":"https://openalex.org/C153294291","wikidata":"https://www.wikidata.org/wiki/Q25261","display_name":"Meteorology","level":1,"score":0.30915018916130066},{"id":"https://openalex.org/C121332964","wikidata":"https://www.wikidata.org/wiki/Q413","display_name":"Physics","level":0,"score":0.242739737033844},{"id":"https://openalex.org/C8058405","wikidata":"https://www.wikidata.org/wiki/Q46255","display_name":"Geophysics","level":1,"score":0.2128409743309021},{"id":"https://openalex.org/C76155785","wikidata":"https://www.wikidata.org/wiki/Q418","display_name":"Telecommunications","level":1,"score":0.16526958346366882},{"id":"https://openalex.org/C1276947","wikidata":"https://www.wikidata.org/wiki/Q333","display_name":"Astronomy","level":1,"score":0.10212922096252441},{"id":"https://openalex.org/C62520636","wikidata":"https://www.wikidata.org/wiki/Q944","display_name":"Quantum mechanics","level":1,"score":0.0}],"mesh":[],"locations_count":2,"locations":[{"id":"doi:10.1109/access.2020.3024920","is_oa":true,"landing_page_url":"https://doi.org/10.1109/access.2020.3024920","pdf_url":"https://ieeexplore.ieee.org/ielx7/6287639/8948470/09199900.pdf","source":{"id":"https://openalex.org/S2485537415","display_name":"IEEE Access","issn_l":"2169-3536","issn":["2169-3536"],"is_oa":true,"is_in_doaj":true,"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":"cc-by","license_id":"https://openalex.org/licenses/cc-by","version":"publishedVersion","is_accepted":true,"is_published":true,"raw_source_name":"IEEE Access","raw_type":"journal-article"},{"id":"pmh:oai:doaj.org/article:393b03f0e1fe46b49fa8f13d2a43c520","is_oa":true,"landing_page_url":"https://doaj.org/article/393b03f0e1fe46b49fa8f13d2a43c520","pdf_url":null,"source":{"id":"https://openalex.org/S4306401280","display_name":"DOAJ (DOAJ: Directory of Open Access Journals)","issn_l":null,"issn":null,"is_oa":false,"is_in_doaj":false,"is_core":false,"host_organization":null,"host_organization_name":null,"host_organization_lineage":[],"host_organization_lineage_names":[],"type":"repository"},"license":"cc-by-sa","license_id":"https://openalex.org/licenses/cc-by-sa","version":"submittedVersion","is_accepted":false,"is_published":false,"raw_source_name":"IEEE Access, Vol 8, Pp 172610-172622 (2020)","raw_type":"article"}],"best_oa_location":{"id":"doi:10.1109/access.2020.3024920","is_oa":true,"landing_page_url":"https://doi.org/10.1109/access.2020.3024920","pdf_url":"https://ieeexplore.ieee.org/ielx7/6287639/8948470/09199900.pdf","source":{"id":"https://openalex.org/S2485537415","display_name":"IEEE Access","issn_l":"2169-3536","issn":["2169-3536"],"is_oa":true,"is_in_doaj":true,"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":"cc-by","license_id":"https://openalex.org/licenses/cc-by","version":"publishedVersion","is_accepted":true,"is_published":true,"raw_source_name":"IEEE Access","raw_type":"journal-article"},"sustainable_development_goals":[],"awards":[{"id":"https://openalex.org/G1616456842","display_name":null,"funder_award_id":"ECR/2018/001701","funder_id":"https://openalex.org/F4320334771","funder_display_name":"Science and Engineering Research Board"}],"funders":[{"id":"https://openalex.org/F4320334771","display_name":"Science and Engineering Research Board","ror":"https://ror.org/03ffdsr55"},{"id":"https://openalex.org/F4320336495","display_name":"Space Applications Centre","ror":null}],"has_content":{"pdf":true,"grobid_xml":true},"content_urls":{"pdf":"https://content.openalex.org/works/W3090170783.pdf","grobid_xml":"https://content.openalex.org/works/W3090170783.grobid-xml"},"referenced_works_count":37,"referenced_works":["https://openalex.org/W1558977531","https://openalex.org/W1586779072","https://openalex.org/W1823941398","https://openalex.org/W1961394378","https://openalex.org/W1963626464","https://openalex.org/W2022395096","https://openalex.org/W2053006067","https://openalex.org/W2058160370","https://openalex.org/W2064672737","https://openalex.org/W2064801095","https://openalex.org/W2075056964","https://openalex.org/W2091677549","https://openalex.org/W2097890888","https://openalex.org/W2121197692","https://openalex.org/W2147719468","https://openalex.org/W2154504714","https://openalex.org/W2339604214","https://openalex.org/W2434099380","https://openalex.org/W2480336446","https://openalex.org/W2608019367","https://openalex.org/W2893253100","https://openalex.org/W2899563669","https://openalex.org/W2917833516","https://openalex.org/W2922950367","https://openalex.org/W2936020702","https://openalex.org/W2979336167","https://openalex.org/W2990229927","https://openalex.org/W2992223761","https://openalex.org/W2999868208","https://openalex.org/W3015112170","https://openalex.org/W3093689040","https://openalex.org/W4245060581","https://openalex.org/W6721311623","https://openalex.org/W6736769874","https://openalex.org/W6773198424","https://openalex.org/W6784484612","https://openalex.org/W7001970218"],"related_works":["https://openalex.org/W4366495655","https://openalex.org/W3081990870","https://openalex.org/W936749771","https://openalex.org/W2008650690","https://openalex.org/W2579896290","https://openalex.org/W2078705677","https://openalex.org/W2887494347","https://openalex.org/W2042464627","https://openalex.org/W2598365277","https://openalex.org/W2059906660"],"abstract_inverted_index":{"The":[0,24,105,133,181],"ionosphere":[1],"is":[2,28,55],"perceived":[3],"to":[4,19,30,85],"be":[5,198],"a":[6],"predominant":[7],"source":[8],"of":[9,12,35,78,90,135,183],"ranging":[10],"error":[11],"Global":[13,176],"Navigation":[14],"Satellite":[15],"System":[16,40,171],"(GNSS)":[17],"signals":[18],"degrade":[20],"the":[21,32,46,52,59,72,76,79,87,91,109,120,130,136,184,188],"positional":[22,33],"accuracy.":[23],"suitable":[25],"ionospheric":[26,48,98,116,143,152,195,204],"model":[27,49,65,93,117,144,173,196],"necessary":[29],"improve":[31],"accuracy":[34],"GNSS":[36,207],"and":[37,100,149,174,202,208],"Satellite-Based":[38],"Augmentation":[39],"(SBAS)":[41],"users.":[42],"In":[43],"this":[44],"paper,":[45],"regional":[47],"(RIM)":[50],"over":[51,71,129],"Indian":[53,73,95,131],"region":[54],"implemented":[56],"based":[57],"on":[58],"adjusted":[60],"spherical":[61],"harmonics":[62],"function":[63],"(ASHF)":[64],"from":[66],"dense":[67],"GPS":[68],"TEC":[69,126],"stations":[70],"region.":[74,132],"Also,":[75],"evaluation":[77],"different":[80],"ASHF":[81,92,115,142,194],"order":[82,89,114,141],"models":[83,153,205],"conducted":[84],"identify":[86,119],"proper":[88],"for":[94,159,200,206],"low":[96],"latitude":[97],"calm":[99],"adverse":[101],"space":[102],"weather":[103],"conditions.":[104],"results":[106,185],"confirm":[107],"that":[108,187],"4":[110,137,189],"<sup":[111,138,190],"xmlns:mml=\"http://www.w3.org/1998/Math/MathML\"":[112,139,191],"xmlns:xlink=\"http://www.w3.org/1999/xlink\">th</sup>":[113,140,192],"can":[118],"northern":[121],"Equatorial":[122],"Ionization":[123],"Anomaly":[124],"(EIA)":[125],"crest":[127],"patterns":[128],"comparison":[134],"carried":[145],"out":[146],"with":[147],"dual":[148],"single":[150,201],"frequency":[151],"like":[154],"as":[155],"Klobuchar":[156,165],"model,":[157,166,169],"Centre":[158],"Orbit":[160],"Determination":[161],"in":[162],"Europe":[163],"(CODE)":[164],"NeQuick":[167],"G":[168],"BeiDou":[170],"(BDS2)":[172],"CODE":[175],"Ionospheric":[177],"Maps":[178],"(GIM)":[179],"models.":[180],"outcome":[182],"indicates":[186],"Order":[193],"would":[197],"potential":[199],"dual-frequency":[203],"SBAS":[209],"systems.":[210]},"counts_by_year":[{"year":2026,"cited_by_count":1},{"year":2023,"cited_by_count":1},{"year":2022,"cited_by_count":3},{"year":2021,"cited_by_count":3}],"updated_date":"2026-06-11T09:08:48.828518","created_date":"2025-10-10T00:00:00"}