Processing Capacity for GPS Data with Clock Slip Using Online PPP Services

The processing capacity for GPS data with clock jumps using four online PPP services(CSRS-PPP,APPS,GAPS,and magicGNSS) are analyzed.The experimental results show that,CSRS-PPP is the most robust service which can effectively deal with the millisecond-level(ms) jumps and avoid the effects on positioning.However it is incapable of the frequent microsecond-level(μs) jumps.APPS can effectively solve the adverse effects of first type ms jumps,but invalid for the second type of ms jumps.GAPS is totally invalid for the first two types of ms jumps for lack of necessary control,which leads to unnecessary re-initializations and unpredicted results.As to magicGNSS,even for the clean data without any clock jump,its positioning results are terrible,and the phenomenon of failure solution often appear.In addition,a brief test of the capacity for clock jumps with TriP 3.0 is presented.The results show that TriP can deal with all the types of clock jumps with a good performance.