The Research On The Variation Of The Gphone’s Scale Factor

Continuous gravity measurement is an important mean of the time-variablegravity field’s observation. The continuous gravimeter is its key equipment. Thenormal observation of the gravimeter is s important in that we could obtain excellentobservation results and guarantee the accuracy of subsequent research achievement.In the gravity networks, the quantity of gPhone gravimeter is up to70percent of theall gravimeters, so it’s especially important whether the gPhone gravimeter couldobtain accurate gravity data. If the scale factor of the gPhone gravimeter deviatedfrom the exact value, this can present difficulties to the explanation and application ofthe observational data. Therefore, the validation of the scale factor’ change of thegPhone gravimeter with height will be of great importance in improving the accuracyof the data output.The main researches and contributions are fourfold:1、Through contrast observation of one gPhone and two CG5gravimeters withsuper gravimeter in Jiufeng of Wuhan and Lasa of Xizang, we obtained high precisionobservation data for calculating changes of scale factor and laid a foundation fordeveloping gPhone gravimeter scale actor change detection and data processingprogram in the future;2、Establish the full-band calibration method and the M2tidal wave amplitudefactor comparative observation calibration method. Wright programs to realize dataconversion, data interpolation and linear fitting of the data;3、Develop the spnng tide and neaping tide’s segmentation, several spnng tides’segmentation combination, different days’ spnng tide segmentation of the full-bandcalibration method and make the scale factor’s variation detection;4、The experiment result indicates that the the scale factor’s variation of gPhoneis0.0012246and its precison is0.00075by the means of M2tidal wave amplitudefactor comparative observation calibration method between Wuhan and Lasa. Thescale factor’s variation of gPhone is0.001902and its precison is0.00072by means of the full-band calibration method. This could state that the scale factor of the gPhonegravimeter changes with reading section. The scale factor of the gPhone gravimeterincrease with the increase in reading section;4、Demonstrate the scale factor’ change of the CG-5gravimeter by means of theM2tidal wave amplitude factor comparative observation calibration method and thefull-band calibration method. We should make fine adjustment to the CG-5gravimeterif we want to use it to calibrate the gPhone gravimeter.