????GPS??λ??????????????????????

??CHAMP?????GPS????????????????GPS??????????????????λ??????????????Ч???GPS?????伸?η??????????????????????????????????????????????GPS???????С????LEO????????????????????????????????????????????仯??С???1~2 cm????????????????????????????GPS??????????????????5 ns??

ERROR EFFECT ANALYSIS OF KINEMATIC PRECISE ORBIT DETERMINATION FROM SATELLITE-BORNE GPS UN-DIFFERENTIAL PHASE OBSERVATIONS

In the un differential phase kinematic precise orbit determination from satellite borne GPS data, besides ionospheric delay, multi path effect, relativistic effect and phase center offset, LEO satellite orbit accuracy is prone to be affected by GPS precise ephemeris from different data centers, spatial geometric distribution of GPS satellite and so on. Taking satellite borne GPS observations on CHAMP satellite as example, we analyze error effect on kinematic precise orbit determination from GPS precise ephemeris, satellite clock bias, phase center offset, relativistic effect and GPS satellite geometric distribution, and achive some helpful results,the main ones are as follows.1)The difference among the GPS orbits obtained from different data processing centers are small.2)The clock error changes between neighboring epochs of the some data centers are small,1-2 cm and the differences of the correction clock error of different data center are large.3)The accuracy of the clock error correction of GPS satellite is better than 5 ns.