Satellite Diagrams

The GRACE satellite viewed from above.

The GRACE satellite viewed from below.

The GRACE satellite with its panels removed.

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Abbreviations Used in GRACE Satellite Diagrams

ACC ICU: Superstar Accelerometer Interface Control Unit
ACC SU: Superstar Accelerometer Sensor Unit
ATH: Attitude Control Thrusters
CESS: Coarse Earth and Sun Sensor
GPS BKUP Antenna: GPS Backup Antenna
GPS NAV Antenna: GPS Navigational Antenna
GPS OCC Antenna: GPS Occultation Antenna
IPU: Instrument Processing Unit
KBR Assembly: K-Band Ranging System Assembly
LRR: Laser Retro Reflective Assembly
MTE: Center of Mass Trim Assembly Electronics
MTM: Center of Mass Trim Assembly Mechanism
MTQ: Magnetorquere
OBDH: On Board Data Handling
OTH-1, OTH-2: Orbit Control Thrusters
PCDU: Power Control and Distribution Unit
RFEA: Radio Frequency Electronics Assembly
SCA Baffle: Star Camera Assembly Baffle
SCA+Y, SCA-Y: Star Camera Assembly
SZA-RX: S-Band Zenith Antenna, Receive
SZA-TX: S-Band Zenith Antenna, Transmit
Tank-X, Tank+X: Cold Gas Tanks
USO-1: Ultra Stable Oscillator

Remote Sensing
Introduction
A Scientific Geodesy
Launch, Components, and Systems
Management and Future
Spacecraft Diagrams