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首页> 外文期刊>The Journal of Navigation >Tightly combined GPS + GLONASS positioning with consideration of inter-system code bias and GLONASS inter-frequency code bias
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Tightly combined GPS + GLONASS positioning with consideration of inter-system code bias and GLONASS inter-frequency code bias

机译：考虑到系统间代码偏差和GLONASS频率间代码偏差，将GPS + GLONASS紧密结合在一起进行定位

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摘要

Inter-system code double differencing is an effective method for improving the positioning accuracy of low-cost receivers in complex environments. Due to the adoption of Frequency Division Multiple Access (FDMA), Globalnaya Navigazionnaya Sputnikovaya Sistema (GLONASS) code observations are affected by the Inter-Frequency Code Biases (IFCBs), which makes it difficult to calculate the Differential Inter-System Code Biases (DISCBs) between GLONASS and the Code Division Multiple Access (CDMA) systems directly. In this contribution, the focus is on the performance of tightly combined Global Positioning System (GPS) and GLONASS code Double Difference (DD) positioning. After analysing the relationship between IFCBs and GLONASS channel numbers, an IFCB correction model and an inter-system code differencing model between GLONASS and GPS are proposed. Results show that even if there is no obvious relationship between IFCBs and channel numbers, the long-term stable IFCB values of each satellite can be obtained by using the proposed model. In addition, the GPS + GLONASS DISCB is also stable. Therefore, compared with the intra-system model, the inter-system model can benefit from prior IFCBs and DISCBs parameters and thus can significantly improve the positioning accuracy in obstructed environments.
机译：系统间代码双重差分是提高复杂环境中低成本接收机定位精度的有效方法。由于采用了频分多址（FDMA），Globalnaya Navigazionnaya Sputnikovaya Sistema（GLONASS）代码观测值受到频率间代码偏差（IFCB）的影响，这使得计算差分系统间代码偏差（DISCBs）变得困难。 ）直接在GLONASS和码分多址（CDMA）系统之间进行。在此贡献中，重点是紧密结合的全球定位系统（GPS）和GLONASS代码双差（DD）定位的性能。在分析了IFCB和GLONASS信道号之间的关系之后，提出了IFCB校正模型和GLONASS与GPS之间的系统间码差异模型。结果表明，即使IFCB与信道号之间没有明显的关系，使用该模型也可以得到每颗卫星的长期稳定IFCB值。此外，GPS + GLONASS DISCB也很稳定。因此，与系统内模型相比，系统间模型可以从现有的IFCB和DISCB参数中受益，从而可以显着提高障碍环境中的定位精度。

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