Reaserch On The Analysis Of The Laws Of Error On The Precise Point Positioning

Along with the development of GNSS,precise point positioning technology constantly improving,especially in the continuous improvement of GPS single point positioning precision,strong,enthusiasm for the study of PPP is becoming more and more people many estimation method to improve the accuracy of the PPP model arises at the historic moment,so the major error sources for GPS precise point positioning model correction,correction of influence on the final positioning result is especially important before and after,for further research and development of new correction effect of the error correction model provides the comparison,for the production of precise point positioning software program designed to provide the reference,so has practical value and theoretical value.Research methods of this article is through the Matlab software GPS single point positioning,by changing the precise point correction method of error sources,or by using the method of comparison before and after,before and after the correction of positioning coordinates,to study the influence of the main error source correction,concrete research content is as follows:1)This paper expounds the basis of precise point positioning(PPP),including the use of precise point positioning(PPP)coordinate system,time system,the summary of IGS,IGS products,puts forward the main error source of precise point positioning and correction method.2)Discusses three kinds of precise point positioning processing observation model,and the advantages and disadvantages of three kinds of model are given,and the precise point positioning are linearized.3)Analyzed the kalman filtering and the sequential least squares,the advantages and disadvantages of the two methods through the study,analyses the precision clock difference interpolation method,this paper expounds the problem of cycle slip detection and the method of gross error elimination.4)It is concluded that poor satellite clock correction to km in distance level;Satellite antenna phase center correction error is 2.8 m;Through the comparison of precise ephemeris and the broadcast ephemeris,satellite orbit correction are deduced with the method of precise ephemeris error is 4.28 m;Neill model of troposphere delay correction,and dry weight correction from 2.3 m to 2.3 m,wet weight correction from 0.21 m to 0.21 m;Study ionospheric correction method,by using the P code electric model of positioning error is 3.64 m;Relativistic effects to correct up to 5 m;The earth rotation error of 78.26 m;Receiver clock difference correction for 24?24.8 m;The error of the earth tide is 15.21 cm;The error of ocean loading tide of 14.05 mm;Tide of error is 2.87 cm;Difference size error is 0.59 mm;The receiver antenna phase center correction within 0.12 m;Antenna phase winding correction within 0.1 m,for seven consecutive days of observed data correction or not positioning difference of 0.01 m.