BDS quad-frequency medium and long baseline ambiguity resolution
With the completion of the BDS-3,China has become the third country that has global navigation satellite system.Furthermore,BDS-3 can broadcast observation signals up to five frequencies,which has great signifi-cance to achieve rapid fixing of ambiguity and improve positioning accuracy.The Ionosphere Reduced(IR)combi-nation has minimal ionospheric delay and integer characteristics,therefore,a solution model based on IR combination is established for medium and long baseline utilizing the quad-frequency observations of BDS-3 in this paper.In the meanwhile,the tropospheric delay is estimated with tropospheric mapping function.The experimental re-sults show that compared with traditional dual-frequency Ionosphere-Free(IF)model,the ambiguity fixing speed of the IR model is improved by more than 10%,and the positioning accuracy in north(N),east(E)and up(U)di-rections are improved by 7.7%,7.9%and 8.2%,respectively.
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