{"id":"https://openalex.org/W620920064","doi":null,"title":"Guidance simulation and test support for differential GPS flight experiment","display_name":"Guidance simulation and test support for differential GPS flight experiment","publication_year":1987,"publication_date":"1987-10-01","ids":{"openalex":"https://openalex.org/W620920064","mag":"620920064"},"language":"en","primary_location":{"id":"pmh:oai:casi.ntrs.nasa.gov:19900000705","doi":null,"is_oa":true,"landing_page_url":"http://hdl.handle.net/2060/19900000705","pdf_url":"http://hdl.handle.net/2060/19900000705","source":{"id":"https://openalex.org/S4377196257","display_name":"NASA STI Repository (National Aeronautics and Space Administration)","issn_l":null,"issn":null,"is_oa":false,"is_in_doaj":false,"is_core":false,"listed_in":[],"host_organization":"https://openalex.org/I4210124779","host_organization_name":"National Aeronautics and Space Administration","host_organization_lineage":["https://openalex.org/I4210124779"],"host_organization_lineage_names":[],"type":"repository"},"license":null,"license_id":null,"version":"submittedVersion","is_accepted":false,"is_published":false,"raw_source_name":"CASI","raw_type":"NAS 1.26:177471"},"volume":null,"type":"article","is_traditional":true,"indexed_in":[],"open_access":{"is_oa":true,"oa_status":"green","oa_url":"http://hdl.handle.net/2060/19900000705","any_repository_has_fulltext":true},"authorships":[{"author_position":"first","author":{"id":"https://openalex.org/A5033142216","display_name":"G. Jeffrey Geier","orcid":null,"observed_orcids":[]},"institutions":[],"countries":[],"is_corresponding":false,"raw_author_name":"G. Jeffrey Geier","raw_affiliation_strings":["Theory and Applications Unlimited Corp. Los Gatos, CA, United States"],"raw_orcid":null,"affiliations":[{"raw_affiliation_string":"Theory and Applications Unlimited Corp. Los Gatos, CA, United States","institution_ids":[]}]},{"author_position":"middle","author":{"id":"https://openalex.org/A5074796648","display_name":"PETER V. W. LOOMIS","orcid":null,"observed_orcids":[]},"institutions":[],"countries":[],"is_corresponding":false,"raw_author_name":"Peter Loomis","raw_affiliation_strings":[],"raw_orcid":null,"affiliations":[]},{"author_position":"last","author":{"id":"https://openalex.org/A5054141556","display_name":"A. R. Cabak","orcid":null,"observed_orcids":[]},"institutions":[],"countries":[],"is_corresponding":false,"raw_author_name":"A. R. Cabak","raw_affiliation_strings":[],"raw_orcid":null,"affiliations":[]}],"institutions":[],"countries_distinct_count":0,"institutions_distinct_count":0,"corresponding_author_ids":[],"corresponding_institution_ids":[],"apc_list":null,"apc_paid":null,"fwci":0.0,"has_fulltext":true,"cited_by_count":0,"citation_normalized_percentile":{"value":0.12314156,"is_in_top_1_percent":false,"is_in_top_10_percent":false},"cited_by_percentile_year":null,"biblio":{"volume":null,"issue":null,"first_page":null,"last_page":null},"is_retracted":false,"is_paratext":false,"is_xpac":false,"primary_topic":{"id":"https://openalex.org/T11325","display_name":"Inertial Sensor and Navigation","score":0.8442000150680542,"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/T11325","display_name":"Inertial Sensor and Navigation","score":0.8442000150680542,"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/T10655","display_name":"GNSS positioning and interference","score":0.11900000274181366,"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/T13855","display_name":"Aerospace Engineering and Control Systems","score":0.021299999207258224,"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/differential-gps","display_name":"differential GPS","score":0.9959999918937683},{"id":"https://openalex.org/keywords/kalman-filter","display_name":"Kalman filter","score":0.6949999928474426},{"id":"https://openalex.org/keywords/helicopter-flight-test","display_name":"helicopter flight test","score":0.8100000023841858},{"id":"https://openalex.org/keywords/steering-algorithms","display_name":"steering algorithms","score":0.6629999876022339},{"id":"https://openalex.org/keywords/time-delay-compensation","display_name":"time delay compensation","score":0.7129999995231628},{"id":"https://openalex.org/keywords/post-test-analysis","display_name":"post-test analysis","score":0.4869999885559082},{"id":"https://openalex.org/keywords/real-time-navigation","display_name":"real-time navigation","score":0.32199999690055847}],"concepts":[{"id":"https://openalex.org/C2777928014","wikidata":"https://www.wikidata.org/wiki/Q779225","display_name":"Differential GPS","level":3,"score":0.7075254917144775},{"id":"https://openalex.org/C60229501","wikidata":"https://www.wikidata.org/wiki/Q18822","display_name":"Global Positioning System","level":2,"score":0.6488497257232666},{"id":"https://openalex.org/C41008148","wikidata":"https://www.wikidata.org/wiki/Q21198","display_name":"Computer science","level":0,"score":0.5316919088363647},{"id":"https://openalex.org/C2777943292","wikidata":"https://www.wikidata.org/wiki/Q3319996","display_name":"Flight test","level":2,"score":0.5302605032920837},{"id":"https://openalex.org/C106131492","wikidata":"https://www.wikidata.org/wiki/Q3072260","display_name":"Filter (signal processing)","level":2,"score":0.5240007638931274},{"id":"https://openalex.org/C157286648","wikidata":"https://www.wikidata.org/wiki/Q846780","display_name":"Kalman filter","level":2,"score":0.48082149028778076},{"id":"https://openalex.org/C44154836","wikidata":"https://www.wikidata.org/wiki/Q45045","display_name":"Simulation","level":1,"score":0.41116976737976074},{"id":"https://openalex.org/C79403827","wikidata":"https://www.wikidata.org/wiki/Q3988","display_name":"Real-time computing","level":1,"score":0.3558516502380371},{"id":"https://openalex.org/C127413603","wikidata":"https://www.wikidata.org/wiki/Q11023","display_name":"Engineering","level":0,"score":0.3285687565803528},{"id":"https://openalex.org/C31972630","wikidata":"https://www.wikidata.org/wiki/Q844240","display_name":"Computer vision","level":1,"score":0.16304215788841248},{"id":"https://openalex.org/C154945302","wikidata":"https://www.wikidata.org/wiki/Q11660","display_name":"Artificial intelligence","level":1,"score":0.15181511640548706},{"id":"https://openalex.org/C76155785","wikidata":"https://www.wikidata.org/wiki/Q418","display_name":"Telecommunications","level":1,"score":0.0}],"mesh":[],"locations_count":2,"locations":[{"id":"pmh:oai:casi.ntrs.nasa.gov:19900000705","doi":null,"is_oa":true,"landing_page_url":"http://hdl.handle.net/2060/19900000705","pdf_url":"http://hdl.handle.net/2060/19900000705","source":{"id":"https://openalex.org/S4377196257","display_name":"NASA STI Repository (National Aeronautics and Space Administration)","issn_l":null,"issn":null,"is_oa":false,"is_in_doaj":false,"is_core":false,"listed_in":[],"host_organization":"https://openalex.org/I4210124779","host_organization_name":"National Aeronautics and Space Administration","host_organization_lineage":["https://openalex.org/I4210124779"],"host_organization_lineage_names":[],"type":"repository"},"license":null,"license_id":null,"version":"submittedVersion","is_accepted":false,"is_published":false,"raw_source_name":"CASI","raw_type":"NAS 1.26:177471"},{"id":"mag:620920064","doi":null,"is_oa":false,"landing_page_url":"https://ntrs.nasa.gov/api/citations/19900000705/downloads/19900000705.pdf","pdf_url":null,"source":{"id":"https://openalex.org/S4306402118","display_name":"NASA Technical Reports Server (NASA)","issn_l":null,"issn":null,"is_oa":false,"is_in_doaj":false,"is_core":false,"listed_in":[],"host_organization":"https://openalex.org/I4210124779","host_organization_name":"National Aeronautics and Space Administration","host_organization_lineage":["https://openalex.org/I4210124779"],"host_organization_lineage_names":[],"type":"repository"},"license":null,"license_id":null,"version":null,"is_accepted":false,"is_published":false,"raw_source_name":null,"raw_type":null}],"best_oa_location":{"id":"pmh:oai:casi.ntrs.nasa.gov:19900000705","doi":null,"is_oa":true,"landing_page_url":"http://hdl.handle.net/2060/19900000705","pdf_url":"http://hdl.handle.net/2060/19900000705","source":{"id":"https://openalex.org/S4377196257","display_name":"NASA STI Repository (National Aeronautics and Space Administration)","issn_l":null,"issn":null,"is_oa":false,"is_in_doaj":false,"is_core":false,"listed_in":[],"host_organization":"https://openalex.org/I4210124779","host_organization_name":"National Aeronautics and Space Administration","host_organization_lineage":["https://openalex.org/I4210124779"],"host_organization_lineage_names":[],"type":"repository"},"license":null,"license_id":null,"version":"submittedVersion","is_accepted":false,"is_published":false,"raw_source_name":"CASI","raw_type":"NAS 1.26:177471"},"sustainable_development_goals":[],"study_designs":[],"awards":[],"funders":[],"has_content":{"grobid_xml":true,"pdf":true},"content_urls":{"pdf":"https://content.openalex.org/works/W620920064.pdf","grobid_xml":"https://content.openalex.org/works/W620920064.grobid-xml"},"referenced_works_count":0,"referenced_works":[],"related_works":["https://openalex.org/W583753433","https://openalex.org/W2316154686","https://openalex.org/W7037853658","https://openalex.org/W842488110","https://openalex.org/W7063368602","https://openalex.org/W2143756958","https://openalex.org/W2545033529","https://openalex.org/W2034411407","https://openalex.org/W7043256240","https://openalex.org/W1545757959"],"abstract_inverted_index":{"Three":[0],"separate":[1],"tasks":[2],"which":[3],"supported":[4],"the":[5,15,22,111,115,138,154,177,182,185,198,205,222,225],"test":[6,8,12,19,212],"preparation,":[7],"operations,":[9],"and":[10,39,66,86,118,129,140,167,203],"post":[11,211],"analysis":[13,183,215],"of":[14,21,33,45,110,153,184,197,221,224],"NASA":[16,80],"Ames":[17],"flight":[18,125,202],"evaluation":[20],"differential":[23,49],"Global":[24],"Positioning":[25],"System":[26],"(GPS)":[27],"are":[28,102],"presented.":[29],"Task":[30,131,174],"1":[31],"consisted":[32],"a":[34,48,67,79,91,108,134,146,217],"navigation":[35,189],"filter":[36,52,73,99,112,200],"design,":[37],"coding,":[38],"testing":[40],"to":[41,56,157,195,204],"optimally":[42],"make":[43],"use":[44],"GPS":[46,95],"in":[47,75,104,181,201],"mode.":[50],"The":[51,72,97,122,149,191],"can":[53],"be":[54],"configured":[55],"accept":[57],"inputs":[58],"from":[59,90],"external":[60],"censors":[61],"such":[62],"as":[63],"an":[64],"accelerometer":[65],"barometric":[68],"or":[69],"radar":[70],"altimeter.":[71],"runs":[74],"real":[76,186],"time":[77,172,187],"onboard":[78],"helicopter.":[81],"It":[82],"processes":[83],"raw":[84],"pseudo":[85],"delta":[87],"range":[88],"measurements":[89],"single":[92],"channel":[93],"sequential":[94],"receiver.":[96],"Kalman":[98,188],"software":[100],"interfaces":[101],"described":[103],"detail,":[105],"followed":[106],"by":[107],"description":[109],"algorithm,":[113],"including":[114],"basic":[116],"propagation":[117],"measurement":[119],"update":[120],"equations.":[121],"performance":[123,192],"during":[124,210],"tests":[126],"is":[127],"reviewed":[128],"discussed.":[130],"2":[132],"describes":[133,176],"refinement":[135],"performed":[136],"on":[137,145],"lateral":[139],"vertical":[141],"steering":[142],"algorithms":[143],"developed":[144],"previous":[147],"contract.":[148],"refinements":[150],"include":[151],"modification":[152],"internal":[155],"logic":[156],"allow":[158],"more":[159,218],"diverse":[160],"inflight":[161],"initialization":[162],"procedures,":[163],"further":[164],"data":[165,209],"smoothing":[166],"compensation":[168],"for":[169],"system":[170],"induced":[171],"delays.":[173],"3":[175],"TAU":[178],"Corp":[179],"participation":[180],"filter.":[190,226],"was":[193],"compared":[194],"that":[196],"Z-set":[199],"laser":[206],"tracker":[207],"position":[208],"analysis.":[213],"This":[214],"allowed":[216],"optimum":[219],"selection":[220],"parameters":[223]},"counts_by_year":[],"updated_date":"2026-11-01T11:40:01.658920","created_date":"2016-06-24T00:00:00"}