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... > Instruments > Earth Remote Sensing Instruments > Active Remote Sensing > Profilers/Sounders > Radar Sounders > DDMI

Preferred term

DDMI  

Definition

  • The Delay Doppler Mapping Instrument (DDMI) flies aboard each of the 8 spacecraft of the CYGNSS constellation and is an L-band receiver designed to receive direct signals from GPS satellites as well as signals reflected off the ocean surface. The direct signals are used to pinpoint the location of the CYGNSS observatory (of which there are 8 unique spacecraft observatories), while the reflected signals correspond to ocean surface roughness, from which wind speed is estimated using a Geophysical Model Function (GMF). Additional Information: https://clasp-research.engin.umich.edu/missions/cygnss/technology-ddmi.php (en)

Broader concept

Change note

  • 2019-12-19 15:43:09.0 [sritz] Insert Concept add broader relation (DDMI [640cd1f2-73c3-42bd-9fd4-527f61f533a5,559577] - Radar Sounders [6c5ca722-0bc7-4ccd-ad24-39b9d8710140,544471]);
  • 2019-12-19 15:43:52.0 [sritz] insert AltLabel (id: null category: primary text: Delay Doppler Mapping Instrument language code: en);
  • 2019-12-19 15:44:32.0 [sritz] insert Definition (id: null text: The Delay Doppler Mapping Instrument (DDMI) flies aboard each of the 8 spacecraft of the CYGNSS constellation and is an L-band receiver designed to receive direct signals from GPS satellites as well as signals reflected off the ocean surface. The direct signals are used to pinpoint the location of the CYGNSS observatory (of which there are 8 unique spacecraft observatories), while the reflected signals correspond to ocean surface roughness, from which wind speed is estimated using a Geophysical Model Function (GMF). language code: en);
  • 2019-12-19 15:45:22.0 [sritz] update Definition (https://clasp-research.engin.umich.edu/missions/cygnss/technology-ddmi.php);
  • 2019-12-19 15:46:55.0 [sritz] update Definition (The Delay Doppler Mapping Instrument (DDMI) flies aboard each of the 8 spacecraft of the CYGNSS constellation and is an L-band receiver designed to receive direct signals from GPS satellites as well as signals reflected off the ocean surface. The direct signals are used to pinpoint the location of the CYGNSS observatory (of which there are 8 unique spacecraft observatories), while the reflected signals correspond to ocean surface roughness, from which wind speed is estimated using a Geophysical Model Function (GMF). Additional Information: https://clasp-research.engin.umich.edu/missions/cygnss/technology-ddmi.php);

URI

https://gcmd.earthdata.nasa.gov/kms/concept/640cd1f2-73c3-42bd-9fd4-527f61f533a5

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