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- e8a927c5-e5a8-43c8-91d4-2ca3785ef019 definition "[Source: NASA/JPL, ftp://podaac.jpl.nasa.gov/pub/grace/doc/ProdSpecDoc_v4.5.pdf ] The GRACE Thruster Activation System is part of the Cold Gas System. The GRACE Cold Gas System uses Nitrogen as medium, which is stored in two tanks at an initial pressure of 350 bar. This upstream pressure is reduced to the thruster valve working pressure of approximately 1.5 bar by a Pressure Regulator. For redundancy reasons, the two branches can be operated individually. Attitude control around the roll, pitch and yaw axis is performed by 3 sets of 4 thrusters with a nominal thrust force of 10 mN. The attitude control thrusters are nominally operated in pairs which are accommodated such, that force free reaction control is achieved. For orbit maintenance, two 40 mN thrusters are mounted on the anti-flight direction side with the force vector pointing through the satellite center of gravity. The cold gas system housekeeping sensor set consists of two Pressure Transducers, one for the high pressure part and one for the low pressure part, and temperature sensors on both tanks and every thruster. [Summary from GRACE Thruster Specification Document] Group: Instrument_Details Entry_ID: THR Group: Instrument_Identification Instrument_Category: Earth Remote Sensing Instruments Instrument_Class: Passive Remote Sensing Instrument_Type: Positioning/Navigation Short_Name: THR Long_Name: THRuster activation system End_Group Group: Instrument_Associated_Sensors Short_Name: TEMPERATURE SENSORS Short_Name: PRESSURE TRANSDUCERS Short_Name: TNK End_Group Group: Associated_Platforms Short_Name: GRACE End_Group Online_Resource: ftp://podaac.jpl.nasa.gov/pub/grace/doc/ProdSpecDoc_v4.5.pdf Creation_Date: 2007-05-02 Group: Instrument_Logistics Instrument_Owner: USA/NASA End_Group End_Group" @default.
- e8a927c5-e5a8-43c8-91d4-2ca3785ef019 id "1655703" @default.
- e8a927c5-e5a8-43c8-91d4-2ca3785ef019 path_id 4f81c61c-f100-4bc4-9664-d9b70d2f162f @default.
- e8a927c5-e5a8-43c8-91d4-2ca3785ef019 path_id 596a5700-b3fd-4261-b8f8-a054d052e3fe @default.
- e8a927c5-e5a8-43c8-91d4-2ca3785ef019 path_id 6015ef7b-f3bd-49e1-9193-cc23db566b69 @default.
- e8a927c5-e5a8-43c8-91d4-2ca3785ef019 path_id b2140059-b3ca-415c-b0a7-3e142783ffe8 @default.
- e8a927c5-e5a8-43c8-91d4-2ca3785ef019 path_label "Earth Remote Sensing Instruments" @default.
- e8a927c5-e5a8-43c8-91d4-2ca3785ef019 path_label "Instruments" @default.
- e8a927c5-e5a8-43c8-91d4-2ca3785ef019 path_label "Passive Remote Sensing" @default.
- e8a927c5-e5a8-43c8-91d4-2ca3785ef019 path_label "Positioning/Navigation" @default.
- e8a927c5-e5a8-43c8-91d4-2ca3785ef019 prefLabel "THR" @default.
- e8a927c5-e5a8-43c8-91d4-2ca3785ef019 reference "" @default.
- e8a927c5-e5a8-43c8-91d4-2ca3785ef019 tag "Instruments" @default.