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首页> 外文期刊>Journal of Geodesy >Timing group delay and differential code bias corrections for BeiDou positioning
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Timing group delay and differential code bias corrections for BeiDou positioning

机译：北斗定位的时序群延迟和差分码偏差校正

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This article first clearly figures out the relationship between parameters of timing group delay (TGD) and differential code bias (DCB) for BDS, and demonstrates the equivalence of TGD and DCB correction models combining theory with practice. The TGD/DCB correction models have been extended to various occasions for BDS positioning, and such models have been evaluated by real triple-frequency datasets. To test the effectiveness of broadcast TGDs in the navigation message and DCBs provided by the Multi-GNSS Experiment (MGEX), both standard point positioning (SPP) and precise point positioning (PPP) tests are carried out for BDS signals with different schemes. Furthermore, the influence of differential code biases on BDS positioning estimates such as coordinates, receiver clock biases, tropospheric delays and carrier phase ambiguities is investigated comprehensively. Comparative analysis show that the unmodeled differential code biases degrade the performance of BDS SPP by a factor of two or more, whereas the estimates of PPP are subject to varying degrees of influences. For SPP, the accuracy of dual-frequency combinations is slightly worse than that of single-frequency, and they are much more sensitive to the differential code biases, particularly for the B2B3 combination. For PPP, the uncorrected differential code biases are mostly absorbed into the receiver clock bias and carrier phase ambiguities and thus resulting in a much longer convergence time. Even though the influence of the differential code biases could be mitigated over time and comparable positioning accuracy could be achieved after convergence, it is suggested to properly handle with the differential code biases since it is vital for PPP convergence and integer ambiguity resolution.
机译：本文首先清楚地指出了BDS的时序组延迟（TGD）和差分码偏置（DCB）参数之间的关系，并论证了理论和实践相结合的TGD和DCB校正模型的等效性。 TGD / DCB校正模型已扩展到BDS定位的各种场合，并且已经通过真实的三频数据集评估了此类模型。为了测试Multi-GNSS实验（MGEX）提供的导航消息和DCB中广播TGD的有效性，对具有不同方案的BDS信号进行了标准点定位（SPP）和精确点定位（PPP）测试。此外，还全面研究了差分码偏置对BDS定位估计的影响，例如坐标，接收器时钟偏置，对流层延迟和载波相位模糊性。比较分析表明，未建模的差分代码偏差使BDS SPP的性能降低了两倍或更多，而PPP的估算受到不同程度的影响。对于SPP，双频组合的精度比单频组合的精度稍差，并且它们对差分代码偏置更为敏感，尤其是对于B2B3组合。对于PPP，未校正的差分码偏置大部分被吸收到接收器时钟偏置和载波相位歧义中，从而导致更长的收敛时间。即使可以随着时间的流逝缓解差分代码偏差的影响，并且收敛后也可以达到可比的定位精度，但由于对PPP收敛和整数歧义解析至关重要，因此建议适当处理差分代码偏差。

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