Simulation Research On Signal Processing Method Of Gravity Gradiometer

Gravity gradiometer is one of the most advanced exploration instrument of the ea rth gravitational field which has great significance to the research of geodynamics,geo physics,navigation guidance,energy exploration and so on.In this paper,the signal p rocessing of rotating accelerometer gravity gradiometer(RAGG)and problems in accel erometer scale factor adjustment were studied.The main contents and results are as fo llows:Measurement principle and signal processing flow of RAGG were analyzed,then gravity gradiometer semi physical simulation system which including data module,sign al conditioning module and signal feedback monitoring module was designed and built.Also the performance test of simulation system proved that the system is reliable.Accelerometer scale factor coefficient matching degree was calculated when measu rement precision of RAGG is 1E.On the problem of signal phase delay,an accelero meter scale factor adjustment scheme with real-time phase compensation calibration wa s proposed in this paper.An accelerometer scale factor adjustment scheme which is based on Fuzzy-PID is proposed.And the scheme is proved to be feasible by experiment which is based on gravity gradiometer semi physical simulation system.The results of accelerometers seal e factor adjustment experiment showed that the degree of consistency between K1 and K1 is 2×10-5 magnitude,the degree of consistency between K3 and K4 is 8×10-6 mag nitude,the degree of consistency between(K1+K2)and(K3+K4)is 5×10-4 magnitude.The studies of this paper can provide theoretical and technical support for the de velopment of practical gravity gradiometer.