Initial analysis for characterizing and mitigating the pseudorange biases of BeiDou navigation satellite system

He, Chengyan; Lu, Xiaochun; Guo, Jianwei; Su, Chengeng; Wei, Wang; Wang, Meng

doi:10.1186/s43020-019-0003-3

Cited by 30 publications

(13 citation statements)

References 8 publications

(8 reference statements)

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“…He et al. (2020) evaluated the S-curve biases of BDS (BeiDou Navigation Satellite System) signals from the sampled data using a 40 m dish antenna. B1I and B3I of BDS were selected as examples to be analysed, considering different parameter configurations of receivers.…”

Section: Introductionmentioning

confidence: 99%

“…Focusing on the non-ideal distortion of the group delay from the ionosphere, Guo et al (2014) performed analysis of the S-curve bias for the Galileo E5 signal (European Union, 2013). He et al (2020) evaluated the S-curve biases of BDS (BeiDou Navigation Satellite System) signals from the sampled data using a 40 m dish antenna. B1I and B3I of BDS were selected as examples to be analysed, considering different parameter configurations of receivers.…”

Section: Introductionmentioning

confidence: 99%

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Analysis of impact of group delay on slope distortion of S-curve in delay locked loop

et al. 2021

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As essential specifications of correlation domain for signal quality evaluation, distortions of the S-curve, including bias and slope distortions of the zero-crossing point, are usually selected as indicators of optimisation in the process of designing the channels of receivers or navigation satellites. Focusing on this issue, we present a detailed analysis of slope distortion in the presence of group delay and amplitude distortions. After validating the theoretical results, we present further discussions about the impacts of different group delay terms on slope distortions. The results indicate that both the odd-order and the even-order terms have impacts on the slope distortion, and higher odd-order terms have less slope distortion compared with the lower odd-order terms. These results are useful for evaluating the slope distortion from the group delay and guiding improvement in design of the channel.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Analysis of impact of group delay on slope distortion of S-curve in delay locked loop

et al. 2021

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“…However, when the signal passes through the satellite-receiver channel, various imperfections of many components of the cascade channel can cause linear or nonlinear distortions of the signal arriving at the entrance of the digital receiver correlator. These distortions will lead to CCF deformations, making the code loop lock point deviate from the true code phase alignment point and thus resulting in pseudorange biases (Soellner et al 2002;Betz 2002;He et al 2020;Vergara et al 2020). Since different signal modulations, satellite-receiver channel characteristics, and signal processing methods have different effects on pseudorange biases, such biases cannot be eliminated by means of differential techniques and are hard to assimilate into existing system error parameters.…”

Section: Introductionmentioning

confidence: 99%

Model and implementation of pseudorange-bias-free linear channel

Kou

2021

GPS Solut

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The nonideal characteristics of the entire channel of satellite navigation signals from generation, propagation to reception will cause signal distortions, resulting in pseudorange biases. Such kind of biases cannot be eliminated by differential technologies and has become a core error source in high-accuracy applications. We study the theoretical model and implementation method of a pseudorange-bias-free linear channel. The ideal channel transfer function equation under the unbiased pseudorange requirement is first derived from the equivalent baseband model. Based on two corresponding criteria and the simulation of the influence of different amplitude- and phase-frequency responses, a digital phase compensation method based on an all-pass filter is proposed to eliminate pseudorange biases. Then the significant effects of the two phase equalizers are validated by a simulation example of the BPSK(10) signal. Finally, the real BDS3 PRN32 and PRN33 satellite B1C signals collected by a 40-m high-gain dish antenna are utilized to invert the channel transfer characteristics and processed by our software receiver. The measurement results demonstrate that the phase equalizers constructed according to either the linear phase criterion or the linear phase plus even-symmetric phase criterion can effectively reduce the pseudorange bias. The model and method provide a reference for payload and receiver optimization and are suitable for various signal structures and applications.

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“…BDS-3 was announced to serve global users on December 27, 2018 (Yang et al 2019). Many scholars have evaluated the performance of BDS-3, including signal quality (Xu et al 2019;Zhang et al 2019;He et al 2020), realtime kinematics (Zhang et al 2019), precise point positioning (Zhang et al 2019), POD (Yan et al 2019;Zeng et al 2019a), and clock performance (Jia et al 2019). Li et al (2019) showed that there is no evident systematic bias between BDS-2 and BDS-3.…”

Section: Introductionmentioning

confidence: 99%

Uncombined precise orbit and clock determination of GPS and BDS-3

et al. 2020

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There is increasing concern about the uncombined (UC) observation model in the field of global navigation satellite system (GNSS). Based on the global positioning system (GPS) and the third-generation BeiDou navigation satellite system (BDS-3), this study processed the UC precision orbit determination (POD) for single and dual systems. First, a UC observation model suitable for multi-GNSS POD was derived, and the ionospheric-free (IF) combination observation model was presented. Although the ambiguity parameters of UC and IF strategies were different after reparameterization, the difference could be removed when processing ambiguity resolution, and the equivalence was proved theoretically. To demonstrate the accuracy of BDS-3 orbits fully, the observation data of approximately 1 month were selected for determining the precise orbit for global positioning system (GPS) only, BDS-3 only, and GPS/BDS-3 systems based on the UC and IF models. The orbit precision of BDS-3 satellites was validated by using metrics, including comparison with precision products released by Wuhan University, orbit boundary discontinuity, and satellite laser ranging (SLR) residuals. The results show that the orbit accuracies of the IF and UC models are almost the same, the difference in orbits is approximately several millimeters, and the clock difference is within 0.01 ns. The GPS/BDS-3 combined solution shows better accuracy compared to other solutions. The average accuracies in the R and 3D directions are approximately 4 and 15 cm, and the clock standard deviation is approximately 0.2 ns compared to external orbit product. The root mean square of SLR residuals is approximately 4 cm.

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Initial analysis for characterizing and mitigating the pseudorange biases of BeiDou navigation satellite system

Cited by 30 publications

References 8 publications

Analysis of impact of group delay on slope distortion of S-curve in delay locked loop

Analysis of impact of group delay on slope distortion of S-curve in delay locked loop

Model and implementation of pseudorange-bias-free linear channel

Uncombined precise orbit and clock determination of GPS and BDS-3

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