Abstract
In this paper, a distributed method to estimate satellite and receiver differential code biases (DCBs) separately utilizing a network of global positioning system (GPS) receivers is proposed. The proposed method consists of many local filters and a single fusion module. Each local filter estimates vertical ionospheric delays (VIDs) and the combined DCBs (CDCBs) by utilizing dual-frequency code and carrier-phase measurements from each receiver. The fusion module gathers the combined DCB estimates and their estimation errors from all the local filters. Then it discriminates the satellite DCBs (SDCBs) and the receiver DCBs (RDCBs) separately. By an experiment, it is shown that the RMS difference of SDCBs and RDCBs between the proposed method and the IGS product are around 0.374 m and 0.424 m, respectively.
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