@prefix adms: <http://www.w3.org/ns/adms#> .
@prefix dcat: <http://www.w3.org/ns/dcat#> .
@prefix dcmitype: <http://purl.org/dc/dcmitype/> .
@prefix dct: <http://purl.org/dc/terms/> .
@prefix foaf: <http://xmlns.com/foaf/0.1/> .
@prefix gsp: <http://www.opengis.net/ont/geosparql#> .
@prefix locn: <http://www.w3.org/ns/locn#> .
@prefix ns1: <https://w3id.org/citedcat-ap/> .
@prefix org: <http://www.w3.org/ns/org#> .
@prefix owl: <http://www.w3.org/2002/07/owl#> .
@prefix vcard: <http://www.w3.org/2006/vcard/ns#> .
@prefix xsd: <http://www.w3.org/2001/XMLSchema#> .

<https://data.aeronomie.be/dataset/> a foaf:Document .

<https://data.aeronomie.be/dataset/515f5b2b-3dbb-4473-a6e8-ba7bfdefbde0#> a dcat:Dataset ;
    dct:accrualPeriodicity "Daily" ;
    dct:bibliographicCitation "Lamy, H. (2026). <i>Raw WAV data from the BRAMS network</i> (Version 1) [Dataset]. Royal Belgian Institute for Space Aeronomy. https://doi.org/10.18758/X620TI37" ;
    dct:creator [ a foaf:Person ;
            dct:identifier <https://orcid.org/0000-0002-5258-3645> ;
            org:memberOf [ a foaf:Organization ;
                    dct:identifier <https://ror.org/03vfw8w96> ;
                    foaf:name "Royal Belgian Institute for Space Aeronomy" ] ;
            foaf:familyName "Lamy" ;
            foaf:givenName "Hervé" ;
            foaf:name "Lamy, Hervé" ] ;
    dct:description """##Description of the network\r
\r
BRAMS (Belgian RAdio Meteor Stations) is a meteor radio forward scatter network located in Belgium and neighboring countries.  \r
The transmitter is located in Dourbes and emits a Continuous Wave (CW) circularly polarized signal at a frequency of 49.97 MHz and with a power of approximately 340 Watts.  \r
Receiving stations use a 3-elements Yagi antenna set up vertically and either an analog (ICOM-R75 or AR5001) or SDR (RSP2 or RSPDx) type receiver. Signals from the antenna are combined with a signal produced by the BRAMS calibrator at 49.9705 MHz before entering the receiving chain. Sampling frequencies are 5512 Hz (for analog-type receivers) or 6048 Hz (for SDR-type receivers). Data are coded on 16 bits. Local Oscillator of the receivers is set up at 49.969 MHz such that beacon signal appears at 1 KHz and calibrator signal appears at 1.5 KHz. ICOM-R75 are not stabilized in frequency so beacon and calibrator frequencies can slowly drift in time. BRAMS data are synchronized using PPS (Pulse Per Second) coming from GPS data.\r
\r
##Raw data format\r
\r
Raw data are saved in WAV format. Size of a single WAV file is approximately 3.3 MB. Metadata are saved in custom chunks:  \r
\r
* BRA1 contains information about sampling rate, local oscillator frequency, start of the file, number of PPS, beacon latitude, longitude and altitude, frequency, power and polarization of the transmitter, ID latitude, longitude and altitude of the receiving antenna, code of the transmitter (BEDOUR) and of the receiving station (e.g. BEOUDS).  \r
* BRA2 contains the PPS\r
\r
##Filename format\r
\r
Filenames format : RAD_BEDOUR_20260530_0000_BEJALH_SYS001. First 3 characters refer to radio observations, characters 5 to 10 refer to the transmitter code, characters 12 to 19 and 21 to 24 refer to the observing time, characters 26 à 31 refer to the receiving station code, and characters 33 to 38 refer to antenna ID.\r
\r
Data are aggregated by day and per receiving station as ZIP files."""@en ;
    dct:identifier "515f5b2b-3dbb-4473-a6e8-ba7bfdefbde0" ;
    dct:issued "2026-05-07T08:13:08.014187"^^xsd:dateTime ;
    dct:language <http://publications.europa.eu/resource/authority/language/ENG> ;
    dct:modified "2026-06-12T12:59:45.865354"^^xsd:dateTime ;
    dct:publisher [ a foaf:Organization ;
            dct:identifier <https://ror.org/03vfw8w96> ;
            foaf:name "Royal Belgian Institute for Space Aeronomy" ] ;
    dct:spatial [ a dct:Location ;
            locn:geometry "POLYGON ((1.9949 49.3955, 6.7146 49.3955, 6.7146 51.5596, 1.9949 51.5596, 1.9949 49.3955))"^^gsp:wktLiteral ] ;
    dct:temporal [ a dct:PeriodOfTime ;
            dcat:startDate "2010-09-23T00:00:00"^^xsd:dateTime ] ;
    dct:title "Raw WAV data from the BRAMS network"@en ;
    dct:type dcmitype:Dataset ;
    owl:versionInfo "1" ;
    adms:identifier <https://doi.org/10.18758/x620ti37> ;
    dcat:contactPoint [ a vcard:Organization ;
            vcard:fn "Royal Belgian Institute for Space Aeronomy"@en,
                "Institut royal d'Aéronomie Spatiale de Belgique"@fr,
                "Koninklijk Belgisch Instituut voor Ruimte-Aeronomie"@nl ;
            vcard:hasEmail <mailto:data-contact@aeronomie.be> ] ;
    dcat:distribution <https://data.aeronomie.be/dataset/515f5b2b-3dbb-4473-a6e8-ba7bfdefbde0/resource/39003b4d-fd02-47cc-ad69-765e65e62122>,
        <https://data.aeronomie.be/dataset/515f5b2b-3dbb-4473-a6e8-ba7bfdefbde0/resource/81fbeabd-190e-44ac-9d74-feca00a5ef4a> ;
    dcat:keyword "Meteoroids"@en,
        "continuous wave"@en,
        "forward scatter"@en,
        "meteors"@en,
        "radio observations"@en ;
    dcat:landingPage <https://data.aeronomie.be/dataset/515f5b2b-3dbb-4473-a6e8-ba7bfdefbde0> ;
    dcat:temporalResolution "PT5M"^^xsd:duration ;
    dcat:theme <https://publications.europa.eu/resource/authority/data-theme/TECH> ;
    foaf:page "BRAMS data viewer : https://brams.aeronomie.be/data/viewer?view=viewer",
        "Website BRAMS : https://brams.aeronomie.be" ;
    ns1:isFundedBy "https://stce.be/",
        "https://www.belspo.be/belspo/Fedra/proj.asp?l=de&COD=IM%2FRT%2F23%2FSORBET" .

<https://data.aeronomie.be/dataset/515f5b2b-3dbb-4473-a6e8-ba7bfdefbde0/resource/39003b4d-fd02-47cc-ad69-765e65e62122> a dcat:Distribution ;
    dct:description """Below are explanations on how to use the BIRA-IASB distribution portal to download BRAMS WAV data :\r
\r
* Select ONE station. If you want to download data from several stations, you need to repeat the operation\r
* Choose the year (among all available years for the selected station)\r
* In the calendar select the desired day(s). You can also select a full month\r
* Click on the button Download data as a ZIP file\r
\r
The structure in the ZIP file is organized as follows : STN > YEAR > MONTH > DAY(S)"""@en ;
    dct:format "WAV" ;
    dct:issued "2026-05-07T08:14:41.038951"^^xsd:dateTime ;
    dct:license <http://publications.europa.eu/resource/authority/licence/CC_BY_4_0> ;
    dct:modified "2026-06-11T08:24:44.736559"^^xsd:dateTime ;
    dct:title "Data download link"@en ;
    dcat:accessURL <https://distributions.aeronomie.be/f34cc848-646b-494b-b6e9-d8bcd67a3f9e> .

<https://data.aeronomie.be/dataset/515f5b2b-3dbb-4473-a6e8-ba7bfdefbde0/resource/81fbeabd-190e-44ac-9d74-feca00a5ef4a> a dcat:Distribution ;
    dct:description "BIRA-IASB Api Data Download"@en ;
    dct:format "API" ;
    dct:issued "2026-06-04T13:19:39.309415"^^xsd:dateTime ;
    dct:license <http://publications.europa.eu/resource/authority/licence/CC_BY_4_0> ;
    dct:modified "2026-06-04T13:19:39.292769"^^xsd:dateTime ;
    dct:title "API data download"@en ;
    dcat:accessURL <https://api.aeronomie.be/api/data/f34cc848-646b-494b-b6e9-d8bcd67a3f9e> .

<http://publications.europa.eu/resource/authority/licence/CC_BY_4_0> dct:type <http://purl.org/adms/licencetype/UnknownIPR> .