ACCURATE DETERMINATION OF SCALE VALUE OF gPh058 GRAVIMETER BY USE OF OBSERVATIONS WITH SGC053 SUPERCONDUCTING GRAVIMETER
Zhang Rui 1) ;Wei Jin 2,3) ;Liu Ziwei 2,3) ;Li Hui 2) ; and Hao Hongtao 2)
1)National Earthquake Infrastructure Service,Beijing 1000362)Institute of Seismology,CEA,Wuhan 4300713)School of Geodesy and Geomatics,Wuhan University,Wuhan 430079
Abstract：Using samesite observations obtained with the SGC053 superconducting gravimeter and the gPh058 gravimeter in Gravitation and Earth Tide Observatory of China (GETOC), the scale value (alias calibration factor) of the gPh058 gravimeter is accurately determined with the Chebyshev polynomial model. Through the analysis of regression order, sampling number, sampling time, the most obvious affect factor is the sampling time. The weighted average scale factor of different sampling times is 1.008 4±0.00 09×10 -8 ms -2/mV. Compared with the harmonic analysis before determination, the numerical results show that tidal parameters of comparatively high accuracy can be achieved with the gPh058 gravimeter. After determination, the amplitude of the residual with synthetic tide and drift correction is only 1/4 of that as before. Although gPh058 gravimeter had been calibrated in factory, the samesite determination should be more reliable.
Zhang Rui ,Wei Jin,Liu Ziwei et al. ACCURATE DETERMINATION OF SCALE VALUE OF gPh058 GRAVIMETER BY USE OF OBSERVATIONS WITH SGC053 SUPERCONDUCTING GRAVIMETER[J]. jgg, 2011, 31(5): 151-155.
