Some Key Technology Research In Geophysical Prospecting Surveying

With the development of Geophysical Prospecting and the expansion of foreign markets,the requirement for surveying work in geophysical prospect is becoming more and more high.At present,GPS technology has been widely used in geophysical survey.The accuracy of the GPS surveying determines the accuracy of the accuracy of the GPS control surveying,and the baseline solution quality is the basis of GPS control survey and the first important work.Combined with the actual production of the geophysical survey,with the comparison and analysis of the correction methods in ionospheric delay and tropospheric delay,it is necessary to select the reasonable error correction model and method to improve the quality of GPS baseline to ensure the accuracy of GPS control survey for the long baseline data processing.Taking the GPS control survey data of a work area in Tarim Basin as an example,the results of GPS baseline calculation using different ionospheric delay and tropospheric delay correction methods were compared and analyzed with the results calculated by using GAMIT software as the reference value.It is proved that the use of dual frequency correction method and Hopfield model can effectively weaken the influence of ionospheric and tropospheric delay on GPS long baseline solution.Compared with the results of GAMIT software,the mean error and root mean square error of the baseline vector for ionospheric delay correction using dual frequency correction and the Hopfield model for tropospheric delay correction are(17mm,11 mm,10mm)and(3mm,4mm,4mm).The mean error and the mean square error of the baseline length are 4mm and18 mm.