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As a consequence of above conducted theoretical study, a time differencing PPP algorithm based on the equivalence principle is derived and can be used to obtain the coordinates difference and average velocity ... In this thesis it is the first time that the specific equivalence of un-differenced and time differencing PPP algorithms is proved theoretically on the basis of the equivalence principle and the equivalence ... with time period constraint. ...doi:10.14279/depositonce-5511 fatcat:zlmmkpmprnbvvg6eml7lb5h7u4