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Long-Term Stability of the SGA-WZ Strapdown Airborne Gravimeter

College of Mechatronics and Automation, National University of Defense Technology, Changsha 410072, China
Author to whom correspondence should be addressed.
Sensors 2012, 12(8), 11091-11099;
Received: 17 June 2012 / Revised: 30 July 2012 / Accepted: 3 August 2012 / Published: 9 August 2012
(This article belongs to the Section Physical Sensors)
Accelerometers are one of the most important sensors in a strapdown airborne gravimeter. The accelerometer’s drift determines the long-term accuracy of the strapdown inertial navigation system (SINS), which is the primary and most critical component of the strapdown airborne gravimeter. A long-term stability test lasting 104 days was conducted to determine the characteristics of the strapdown airborne gravimeter’s long-term drift. This stability test was based on the first set of strapdown airborne gravimeters built in China, the SGA-WZ. The test results reveal a quadratic drift in the strapdown airborne gravimeter data. A drift model was developed using the static data in the two end sections, and then this model was used to correct the test data. After compensating for the drift, the drift effect improved from 70 mGal to 3.46 mGal with a standard deviation of 0.63 mGal. The quadratic curve better reflects the drift’s real characteristics. In comparison with other methodologies, modelling the drift as a quadratic curve was shown to be more appropriate. Furthermore, this method allows the drift to be adjusted throughout the course of the entire campaign. View Full-Text
Keywords: strapdown airborne gravimeter; long-term stability; drift; quadratic curve strapdown airborne gravimeter; long-term stability; drift; quadratic curve
MDPI and ACS Style

Cai, S.; Zhang, K.; Wu, M.; Huang, Y. Long-Term Stability of the SGA-WZ Strapdown Airborne Gravimeter. Sensors 2012, 12, 11091-11099.

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