| definition |
- [Source: NASA/Utexas, http://www.csr.utexas.edu/grace/spacecraft/sat.html ]
The Attitude and Orbit Control System (AOCS) consists of sensors, actuators and software. The sensors include the DSS Coarse Earth Sun Sensor (CESS) for omni-directional, coarse attitude measurement in the initial acquisition, survival and stand-by modes of the satellite. The high precision sensors include the SCA and GPS receiver. An Inertial Reference Unit (IRU), used in survival modes, provides 3-axis rate information. A Förster Magnetometer is mounted on the deployable boom, to provide additional rate information. The actuators for the AOCS include Cold Gas Assembly and a Magnetorquer. The GN2 reaction control system includes two pressure vessels, valves, regulators and filters, along with 12 attitude control thrusters and two orbit control thrusters. Three magnetorquers with linear dipole moments of 30 Am2 complete the set of AOCS actuators.
Group: Instrument_Details
Entry_ID: MTQ
Group: Instrument_Identification
Instrument_Category: Earth Remote Sensing Instruments
Instrument_Class: Passive Remote Sensing
Instrument_Type: Magnetic Field/Electric Field Instruments
Short_Name: MTQ
Long_Name: Magnetic Torque Rod
End_Group
Group: Associated_Platforms
Short_Name: GRACE
End_Group
Online_Resource: http://www.csr.utexas.edu/grace/spacecraft/sat.html
Creation_Date: 2009-08-14
Group: Instrument_Logistics
Instrument_Owner: USA/NASA
End_Group
End_Group
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