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... > Instruments > Earth Remote Sensing Instruments > Passive Remote Sensing > Positioning/Navigation > GPS > GAP

Preferred term

GAP  

Definition

  • GAP (GPS Attitude and Positioning Experiment) instrument objective is to measure S/C velocity and attitude as well as TEC (Total Electron Content) of the ionosphere. The relative phase delay of signals in both the L1 and L2 bands from a GPS satellite occulted by the limb ionosphere provide large-scale (1000's of km) information on how the total electron content responds to magnetospheric perturbations. GAP consists of two components: - GAP-A: Three single-frequency (L1) GPS receivers and four patch antennas. This package is being used to provide an accurate absolute time reference, spacecraft 3-D attitude, and post-processed spacecraft position and velocity. - GAP-O: The objective is to provide ionospheric tomography observations. (en)

Broader concept

Change note

  • 2019-04-25 08:22:30.0 [mmorahan] Insert Concept add broader relation (GAP [02a50e11-e6ee-4b05-a157-32cf57a74adf,368677] - GPS [47d0c7c0-683c-42a9-b53b-53b684972b52,347039]);
  • 2019-04-25 08:24:57.0 [mmorahan] insert AltLabel (id: null category: primary text: GPS Attitude and Positioning Experiment language code: en); insert Definition (id: null text: GAP (GPS Attitude and Positioning Experiment) instrument objective is to measure S/C velocity and attitude as well as TEC (Total Electron Content) of the ionosphere. The relative phase delay of signals in both the L1 and L2 bands from a GPS satellite occulted by the limb ionosphere provide large-scale (1000's of km) information on how the total electron content responds to magnetospheric perturbations. GAP consists of two components: - GAP-A: Three single-frequency (L1) GPS receivers and four patch antennas. This package is being used to provide an accurate absolute time reference, spacecraft 3-D attitude, and post-processed spacecraft position and velocity. - GAP-O: The objective is to provide ionospheric tomography observations. language code: en); insert WeightedRelation (id: null related concept uuid: 66f5d236-40fb-4a41-96a4-761d48103765 relationship type: null relationship value: null generated by: null);

URI

https://gcmd.earthdata.nasa.gov/kms/concept/02a50e11-e6ee-4b05-a157-32cf57a74adf

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