{"@context":{"@vocab":"https://cir.nii.ac.jp/schema/1.0/","rdfs":"http://www.w3.org/2000/01/rdf-schema#","dc":"http://purl.org/dc/elements/1.1/","dcterms":"http://purl.org/dc/terms/","foaf":"http://xmlns.com/foaf/0.1/","prism":"http://prismstandard.org/namespaces/basic/2.0/","cinii":"http://ci.nii.ac.jp/ns/1.0/","datacite":"https://schema.datacite.org/meta/kernel-4/","ndl":"http://ndl.go.jp/dcndl/terms/","jpcoar":"https://github.com/JPCOAR/schema/blob/master/2.0/"},"@id":"https://cir.nii.ac.jp/crid/1361981469957668992.json","@type":"Article","productIdentifier":[{"identifier":{"@type":"DOI","@value":"10.1029/rs023i006p01013"}},{"identifier":{"@type":"URI","@value":"https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1029%2FRS023i006p01013"}},{"identifier":{"@type":"URI","@value":"https://agupubs.onlinelibrary.wiley.com/doi/pdf/10.1029/RS023i006p01013"}}],"dc:title":[{"@value":"Estimation error of spectral parameters of mesosphere‐stratosphere‐troposphere radars obtained by least squares fitting method and its lower bound"}],"description":[{"type":"abstract","notation":[{"@value":"<jats:p>We have calculated the estimation error of parameters of echo power spectra observed by mesosphere‐stratosphere‐troposphere (MST) radars by means of computer simulations for least squares fitting and moment methods. The least squares fitting method is shown to be better than the moment method in the region with low signal‐to‐noise ratio (snr), especially for narrow spectra. However, the estimation error of the fitting method at infinite snr is approximately twice that of the moment method. This has been attributed to the nature of the statistical fluctuation of the power spectral density, which shows a χ<jats:sup>2</jats:sup> distribution. For both methods at infinite snr we have derived equations which show the accuracy of the estimates versus observation period and spectral width. When we use the fitting method for the data observed with the MU radar (46.5 MHz), the typical errors of the radial wind velocities are 0.7 and 2.0 m s<jats:sup>−1</jats:sup> in the stratosphere and in the mesosphere, respectively. By calculating the logarithm of the spectrum with inifite snr and fitting a parabolic curve to it, the error of the Doppler shift has become approximately 20 times smaller than that of the moment method. It has been shown that this is one technique to achieve the theoretical lower bound of the estimates.</jats:p>"}]}],"creator":[{"@id":"https://cir.nii.ac.jp/crid/1381981469957668992","@type":"Researcher","foaf:name":[{"@value":"Mamoru Yamamoto"}]},{"@id":"https://cir.nii.ac.jp/crid/1381981469957668993","@type":"Researcher","foaf:name":[{"@value":"Toru Sato"}]},{"@id":"https://cir.nii.ac.jp/crid/1381981469957668994","@type":"Researcher","foaf:name":[{"@value":"Peter T. May"}]},{"@id":"https://cir.nii.ac.jp/crid/1381981469957668997","@type":"Researcher","foaf:name":[{"@value":"Toshitaka Tsuda"}]},{"@id":"https://cir.nii.ac.jp/crid/1381981469957668996","@type":"Researcher","foaf:name":[{"@value":"Shoichiro Fukao"}]},{"@id":"https://cir.nii.ac.jp/crid/1381981469957668995","@type":"Researcher","foaf:name":[{"@value":"Susumu Kato"}]}],"publication":{"publicationIdentifier":[{"@type":"PISSN","@value":"00486604"},{"@type":"EISSN","@value":"1944799X"},{"@type":"PISSN","@value":"https://id.crossref.org/issn/00486604"}],"prism:publicationName":[{"@value":"Radio Science"}],"dc:publisher":[{"@value":"American Geophysical Union (AGU)"}],"prism:publicationDate":"1988-11","prism:volume":"23","prism:number":"6","prism:startingPage":"1013","prism:endingPage":"1021"},"reviewed":"false","dc:rights":["http://onlinelibrary.wiley.com/termsAndConditions#vor"],"url":[{"@id":"https://api.wiley.com/onlinelibrary/tdm/v1/articles/10.1029%2FRS023i006p01013"},{"@id":"https://agupubs.onlinelibrary.wiley.com/doi/pdf/10.1029/RS023i006p01013"}],"createdAt":"2008-02-06","modifiedAt":"2023-09-22","relatedProduct":[{"@id":"https://cir.nii.ac.jp/crid/1050282813184368384","@type":"Article","resourceType":"学術雑誌論文(journal article)","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@language":"en","@value":"Vertical structure of the lower troposphere derived from MU radar, unmanned aerial vehicle, and balloon measurements during ShUREX 2015"}]},{"@id":"https://cir.nii.ac.jp/crid/1050848650246933760","@type":"Article","resourceType":"学術雑誌論文(journal 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Scale 3D Wind Field Observation With a Multistatic Equatorial Atmosphere Radar(<Special Issue>CPEA-Coupling Processes in the Equatorial Atmosphere)"}]},{"@id":"https://cir.nii.ac.jp/crid/1390001206503356032","@type":"Article","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@language":"en","@value":"Recent Advances in Atmospheric Radar Study"},{"@value":"Recent Advances in Atmospheric Radar Study(125th Anniversary Issue of the Meteorological Society of Japan)"}]},{"@id":"https://cir.nii.ac.jp/crid/1390001206504566912","@type":"Article","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@language":"ja","@value":"MUレーダー多数ビーム観測により検出された下部成層圏小規模内部重力波"},{"@language":"en","@value":"Small-scale Gravity Waves in the Lower Stratosphere Revealed by the MU Radar Multi-beam Observation"}]},{"@id":"https://cir.nii.ac.jp/crid/1390282681479785088","@type":"Article","relationType":["isReferencedBy"],"jpcoar:relatedTitle":[{"@language":"en","@value":"Vertical Wind Characteristics in Precipitating Cloud Systems over West Sumatera, Indonesia, Observed with Equatorial Atmosphere Radar: Case Study of 23-24 April 2004 during the First CPEA Campaign Period"},{"@value":"Vertical Wind Characteristics in Precipitating Cloud Systems over West Sumatera, Indonesia, Observed with Equatorial Atmosphere Radar : Case Study of 23-24 April 2004 during the First CPEA Campaign Period(<Special Issue>CPEA-Coupling Processes in the Equatorial 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