The Aristoteles gravity mission is achieved in part by performing gradiometry measurements using an instrument called GRADIO. Its principle is based on the simultaneous measurement of acceleration on several locations of a very stable plate (the GRADIO plate) equipped with high accuracy three axes accelerometers. To correct misalignment errors and accelerometer parameters (scale factors, nonlinearities), a calibration system, fixed in the center of the GRADIO plate is used. The requirements placed on GRADIO components resulting in the design described are presented. A gradiometry performance analysis is presented taking into account mission and spacecraft considerations. This analysis gives good confidence in meeting the gradiometry requirement which is to measure components Tyy and Tzz of the gravity gradient tensor in the 0.005, 0.125 Hz frequency bandwidth with an accuracy of 0.01 EU.
Gradiometer Payload
1991
4 pages
Report
Keine Angabe
Englisch
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