{
  "termsOfUse": "https://cdn.earthdata.nasa.gov/conduit/upload/5182/KeywordsCommunityGuide_Baseline_v1_SIGNED_FINAL.pdf",
  "keywordVersion": "draft",
  "schemeVersion": "2025-07-25",
  "viewer": "https://gcmd.earthdata.nasa.gov/KeywordViewer/scheme/instruments/9bfd9ff7-b838-4834-bd47-0127384c79f7",
  "lastModifiedDate": "2026-05-06T15:55:27.462Z",
  "uuid": "9bfd9ff7-b838-4834-bd47-0127384c79f7",
  "prefLabel": "DORIS",
  "isLeaf": true,
  "scheme": {
    "shortName": "instruments",
    "longName": "Instruments"
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  "broader": [
    {
      "uuid": "7561d126-2baf-4583-a6cc-f8159ebf8e94",
      "prefLabel": "Radio",
      "scheme": {
        "shortName": "instruments",
        "longName": "Instruments"
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    }
  ],
  "narrower": [],
  "related": [
    {
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      "prefLabel": "SPOT-5",
      "scheme": {
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    },
    {
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      "prefLabel": "Sentinel-3B",
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      "prefLabel": "Sentinel-3A",
      "scheme": {
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        "longName": "Platforms"
      },
      "type": "is_on_platform"
    },
    {
      "uuid": "5fe45cae-f4ce-4287-8af8-0d824807f3fc",
      "prefLabel": "SPOT-4",
      "scheme": {
        "shortName": "platforms",
        "longName": "Platforms"
      },
      "type": "is_on_platform"
    },
    {
      "uuid": "d333cd96-f1f0-4179-9fbc-162b18fcb8c8",
      "prefLabel": "SPOT-3",
      "scheme": {
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        "longName": "Platforms"
      },
      "type": "is_on_platform"
    },
    {
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      "prefLabel": "SPOT-2",
      "scheme": {
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        "longName": "Platforms"
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      "type": "is_on_platform"
    },
    {
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      "prefLabel": "CRYOSAT-2",
      "scheme": {
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        "longName": "Platforms"
      },
      "type": "is_on_platform"
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  ],
  "definitions": [
    {
      "text": "Doppler Orbitography by Radiopositioning Integrated on Satellite (DORIS) is a dual-frequency Doppler system consisting of a receiver flying aboard a satellite and a globally distributed network of ground beacons. The DORIS receiver on-board the orbiting satellite tracks the dual-frequency radio signals transmitted by the network of ground beacons and generates the DORIS data. A measurement is made of either the Doppler shift or absolute phase as the satellite’s orbit moves over the ground-based beacon.\n\nDORIS has been included as a host experiment on various space missions. Current missions with on-board DORIS receivers are CryoSat-2, HY-2A, Jason-3, Sentinel-6 Michael Freilich, and Satellite for ARgos and ALtiKa (SARAL). Legacy missions include TOPEX/Poseidon, Jason-1 and -2/OSTM, Envisat, and SPOT-4 and -5.\n\nUnlike many other navigation systems, DORIS is based on an uplink device. The receivers are on board the satellite while the transmitters are on the ground. This creates a centralized system in which the complete set of observations is downloaded by the satellite to the ground center, from where they are distributed after editing and processing.",
      "reference": "https://earth.esa.int/eogateway/instruments/doris/description;  https://www.earthdata.nasa.gov/data/space-geodesy-techniques/doris"
    }
  ],
  "altLabels": [
    {
      "category": "primary",
      "text": "Doppler Orbitography and Radiopositioning Integrated by Satellite"
    }
  ],
  "resources": []
}