Modeling and application of the time-varying GPS differential code bias between C1 and P1 observations

Li, Haojun; Xiao, Jingxin; Yang, Ling

doi:10.1016/j.asr.2019.10.018

Cited by 6 publications

(2 citation statements)

References 12 publications

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“…In the current airborne test equipment, the GPS differential device can be used to measure the relative position between the antennas, but the measurement result is the northeast relative coordinates between the antennas of the GPS differential device [7][8]. To reduce the error caused by GPS installation position,the entire space datum be established based on the oil receiving probe and the oil receiving machine coordinate system during the entire flight test process.…”

Section: Introductionmentioning

confidence: 99%

Research on relative positioning algorithm for large aircraft aerial refueling

Zhang²

2023

International Conference on Precision Instruments and Optical Engineering (PIOE 2022)

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When two aircraft interact in an aerial refueling operation (confluence, pre-docking, docking and separation), it is challenging for pilots alone to control the distance and speed between the two aircrafts. Based on GPS dynamic differential equipment, this paper studies the relative positioning algorithm that measures the relative position between the refueling probe and drogue, forming a unified coordinate system of the moving space platform. This method builds a high-precision, stable and reliable two-machine relative position measurement special system and provides auxiliary guidance and safety warning for the aerial refueling process.

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Section: Introductionmentioning

confidence: 99%

Research on relative positioning algorithm for large aircraft aerial refueling

Zhang²

2023

International Conference on Precision Instruments and Optical Engineering (PIOE 2022)

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“…These biases are typically studied through redundant observations, which facilitate the formation of geometry-free combinations. For instance, the differential code bias (DCB) from C1 and P1 observations on one frequency is computed and analyzed by examining their differences and corresponding residuals [17]. As GNSS has developed, GPS, BDS and Galileo now offer multi-frequency observations.…”

Section: Introductionmentioning

confidence: 99%

Reconstructed estimation method of the multi-frequency GNSS inter-frequency clock bias

Xiao,

Li,

Kang

et al. 2023

Meas. Sci. Technol.

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In consideration of contributions from both carrier phase and pseudorange observations during computation, this study introduces a reconstructed method for estimating the multi-frequency global navigation satellite system (GNSS) inter-frequency clock biases (IFCB). Diverging from conventional approaches that separately calculate the time-varying and constant parts of IFCBs using carrier phase and pseudorange observations, the reconstructed method directly utilizes their combination to estimate satellite IFCBs. To validate the efficacy of the presented approach, 7 d observations from 87 International GNSS Service (IGS) stations are analyzed, with a specific focus on triple-frequency GPS, multi-frequency BDS-3, and Galileo IFCBs, aiming to scrutinize their distinctive characteristics. Furthermore, the performances of satellite IFCB estimation are investigated in both precise point positioning (PPP) and single-point positioning (SPP) using 35 IGS stations over 3 d. The results demonstrate that IFCBs of GPS BLOCK IIIA satellites exhibit centimeter-level variations, distinguishing them from BLOCK IIF counterparts. The Galileo IFCBs vary from millimeter to centimeter level, while those of BDS-3 reach a centimeter level. These variations significantly impact GPS PPP convergence performances but have minimal effects on Galileo and BDS-3 PPP. SPP performances are slightly enhanced when the time-varying IFCB part are taken into account. Additionally, we note disparities in the constant parts of satellite IFCBs computed with differential code bias (DCB) products, reconstructed, and pseudorange observation-based methods, particularly for BDS-3 C2I/C6I-C1P/C5P and C2I/C6I-C1P/C6I combinations. The differences of IFCB estimated with different strategies, SPP and PPP performances show that the reconstructed method is better than others, and the IFCB accuracy decreases when computed with satellite DCB products.

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Feasibility of easy-to-implement methods to analyze systematic errors of multipath, differential code bias, and inter-system bias for low-cost receivers

Yuan

et al. 2021

GPS Solut

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Modeling and application of the time-varying GPS differential code bias between C1 and P1 observations

Cited by 6 publications

References 12 publications

Research on relative positioning algorithm for large aircraft aerial refueling

Research on relative positioning algorithm for large aircraft aerial refueling

Reconstructed estimation method of the multi-frequency GNSS inter-frequency clock bias

Feasibility of easy-to-implement methods to analyze systematic errors of multipath, differential code bias, and inter-system bias for low-cost receivers

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