DEVELOPMENT OF DIGITAL ELECTROSTATIC FEEDBACK SYSTEM OF LaCoste & Romberg ET GRAVIMETER
Zhang Biao 1,2) ;Liu Ming 1) ;Zheng Shaohuai 1) ;Sun Heping 1) ; and Chen Xiaodong 1)
1)Key laboratory of Dynamical Geodesy，Institute of Geodesy and Geophysics, CAS, Wuhan 4300772)Graduate University of Chinese Academy of Sciences, Beijing 100049
Abstract：The principle of the digital electrostatic feedback system developed with computer technology and control algorithm of digital PID(Proportion Integral Derivative) control is systematically introduced. In addition, it is the first time in China that this new system is successfully used in the update of LaCoste & Romberg (LCR) ET20 gravimeter. The experimental results of the LCR ET20 gravimeter with the new system installed show that problems of analog electrofeedback system, such as the difficulty to adjust linearity and the worse longterm stability, are basically resolved. Moreover, the precision of gravimeter has increased.
Zhang Biao,Liu Ming ,Zheng Shaohuai et al. DEVELOPMENT OF DIGITAL ELECTROSTATIC FEEDBACK SYSTEM OF LaCoste & Romberg ET GRAVIMETER[J]. jgg, 2011, 31(2): 149-152.
