Abstract
Pseudo-code noise amplification theory of ionosphere-free combination is studied in this article, In allusion to the disadvantage of iono-free combination, The balance between the noise reduction and the incomplete elimination of ionospheric delay is finded. A new combination is proposed considering both the noise reduction and the ionospheric correction, which is called Iono-weak combination. According to the experiment, we reach the conclusion that the SPP result of ionosphere-weak combination is better than ionosphere-free combination with GPS data. The positioning accuracy of optimal combination can be increased about 15%. In allusion to the phenomenon that BDS ionosphere-weak combination can only improve the horizontal precision, the assumption of Total Group Delay (TGD) effect in BDS broadcast ephemeris is raised. The experiment result of BDS is consistent with GPS using ionosphere-weak combination without TGD correction. The rationality of the assumption is proved.
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