Computer Science – Performance
Scientific paper
Jan 2002
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2002iaf..confe.567t&link_type=abstract
IAF abstracts, 34th COSPAR Scientific Assembly, The Second World Space Congress, held 10-19 October, 2002 in Houston, TX, USA.,
Computer Science
Performance
Scientific paper
The unique micro-gravity environment in space has brought high-precision accelerometer numerous space applications, like the measurements of micro-gravity, the Earth's gravity, gravity gradient, and the research on atmospheric drag, solar radiation pressure, the Earth's diffuse reflection, and so on. This paper describes two systems for micro-acceleration measurement, one of which has been used to monitor the micro-gravity level in low-orbit spacecrafts, and the other is being studied for future space application on the recovery of the Earth's gravity field. The details include: 1.CMAMS for space micro-gravitational acceleration measurement The Chinese Micro-gravitational Acceleration Measurement System (CMAMS) is the third generation system for space micro-gravity measurement. The sensor used in the CMAMS is a quartz accelerometer. With its outstanding technical characteristics, like wide measurement range, broad frequency band, high measurement precision, high timing precision, and many other useful functions, such as data statistic, frequency spectrum analysis, default order, external order, data record and quasi-real-time data transfer, CMAMS works very well in a recent low-orbit flight, and some interesting results have been obtained. 2.NIAMS for the fine determination of the Earth's gravity field The Non-Inertial Acceleration Measurement System (NIAMS) is being studied in China, which will be used, as one of the important instruments, for the measurement of the Earth's gravity field. The sensor that would be used in NIAMS is a high-precision electrostatically suspended accelerometer. With its superexcellent performance through optimal structural design and electrostatic servo control system, the electrostatic accelerometer will be well suited for space applications. The electrostatic force gives the possibility to generate very weak but accurate accelerations while the capacitive sensing offers a high position resolution with negligible back-action. Besides for the determination of the Earth's gravity field, the NIAMS can be used for the monitoring of the low-frequency micro-gravity environment. The precision objective of NIAMS is 1 ng/Hz1/2 within the frequency bandwidth from 10-4 to 10-1 Hz.
Cheng Yufeng
Lei Jungang
Tang Furong
Xue Datong
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