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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.
Received: 17 June 2012; in revised form: 30 July 2012 / Accepted: 3 August 2012 / Published: 9 August 2012
Abstract: 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.
Keywords: strapdown airborne gravimeter; long-term stability; drift; quadratic curve
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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.
Cai S, Zhang K, Wu M, Huang Y. Long-Term Stability of the SGA-WZ Strapdown Airborne Gravimeter. Sensors. 2012; 12(8):11091-11099.
Cai, Shaokun; Zhang, Kaidong; Wu, Meiping; Huang, Yangming. 2012. "Long-Term Stability of the SGA-WZ Strapdown Airborne Gravimeter." Sensors 12, no. 8: 11091-11099.