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Traceable method for differential code bias estimation in PPP one-way timing
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DOI：10.1007/s10291-026-02126-5.png)
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Abstract
En 中文
Precise point positioning (PPP) is a key technology for achieving high-precision global navigation satellite system (GNSS) timing service. As one of the essential products for multi-frequency PPP, the differential code bias (DCB) products provided by International GNSS Service (IGS) analysis centers meet the requirements of precise positioning. However, due to inconsistencies in the reference definition between these DCB products and the hardware delay calibration values provided by the International Bureau of Weights and Measures (BIPM) time laboratories, existing DCB products cannot be directly applied to PPP timing. To address this issue, we propose a traceable DCB estimation method that establishes a link between the DCB reference and the UTC(k) maintained by time laboratories, thereby fulfilling the requirements of PPP timing. Our approach is validated using observation data from 236 Multi-GNSS Experiment (MGEX) stations and 9 time laboratories. The results demonstrate that: For satellite-specific traceable DCB, the stability of the proposed traceable products shows a maximum improvement of 0.20 ns (57% enhancement) compared to Chinese Academy of Sciences (CAS) products; For receiver-specific traceable DCB, the accuracy is better than 0.80 ns when referenced to BIPM calibration values, with stability comparable to Center for Orbit Determination in Europe (CODE) products; In PPP one-way timing applications, using the traceable DCB products achieves a maximum improvement of 0.21 ns (50% enhancement) in timing standard deviation and 1.60 ns (85% enhancement) in timing accuracy compared to using CODE products, demonstrating significant application value. This study not only enables multi-frequency PPP timing services but also provides a novel method for the remote relative calibration of GNSS receiver hardware delays.
Keywords:
PPP one-way timing
Differential code bias
Traceability
Receiver hardware delay calibration
UTC(k)
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339
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6.4K
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