Signal simulation of gravity gradient for gravity gradiometer of rotating accelerometer
CAI Ti-Jing1, QIAN Xue-Wu1, DING Hao2
1. School of Instrument Science and Engineering, Southeast University, Nanjing 210096, China;
2. Beijing Aerospace Control Device Institute, Beijing 100039, China
This paper presents the simulation system of gravity gradiometer of rotating accelerometer and, according to the working principle of gravity gradiometer of rotating accelerometer, puts forward the method for gravity gradient signal simulation. The process of simulating gravity gradient signal is as follows: digit signals of accelerometers are produced by computer and gravity gradient is obtained through digit and analog conversion, analog operation, amplification, filter, analog and digit conversion, and modulation. By using this simulation method, the signal characteristics, parameter adjustment, error compensation and signal processing method can be further studied, and the results can serve as references for gravity gradiometer instrument design and development.
[1] 蔡体菁,周百令.重力梯度仪的现状和前景[J]. 中国惯性技术学报,1999,7(1):39-42.[2] Difrancesco D,Grierson A,Dan K,et al.Gravity gradiometer systems-advances and challenges[J]. Geophysical Prospecting,2009,57(4):615-623.[3] Dransfield M,Christensen A.Performance of airborne gravity gradiometers[J]. The leading Edge,2013,32(8):908-922.[4] Braga M A,Endo I,Galbiatti H F,et al.3D full tensor gradiometry and Falcon Systems data analysis for iron ore exploration:Baú Mine,Quadrilátero Ferrífero,Minas Gerais,Brazil[J]. Geophysics,2014,79:213-B220.
