A multipath mitigation method in long-range RTK for deformation monitoring

Chen, Dezhong; Ye, Shirong; Xia, Fengyu; Cheng, Xiaohuan; Zhang, Hongping; Jiang, Weiping

doi:10.1007/s10291-022-01281-9

Cited by 8 publications

(4 citation statements)

References 23 publications

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“…Han et al [105] used the sidereal filtering method to correct the multipath errors of GNSS landslide deformation monitoring data in the Qinba mountainous area and loess monitoring environment in real time, and the positioning residual accuracy was improved to the millimeter level. Chen et al [106] considered that tropospheric errors and multipath errors exist simultaneously in long-baseline real-time kinematic (RTK) positioning, and corrected tropospheric errors and multipath errors successively by using the undifferenced residuals of satellites. This research provided an effective research strategy for long-baseline, high-precision, real-time dynamic carrier-phase difference technology RTK deformation monitoring.…”

Section: Gnss Deformation Monitoringmentioning

confidence: 99%

GNSS Carrier-Phase Multipath Modeling and Correction: A Review and Prospect of Data Processing Methods

Zhang,

Sun

et al. 2024

Remote Sensing

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A multipath error is one of the main sources of GNSS positioning errors. It cannot be eliminated by forming double-difference and other methods, and it has become an issue in GNSS positioning error processing, because it is mainly related to the surrounding environment of the station. To address multipath errors, three main mitigation strategies are employed: site selection, hardware enhancements, and data processing. Among these, data processing methods have been a focal point of research due to their cost-effectiveness, impressive performance, and widespread applicability. This paper focuses on the review of data processing mitigation methods for GNSS carrier-phase multipath errors. The paper begins by elucidating the origins and mitigation strategies of multipath errors. Subsequently, it reviews the current research status pertaining to data processing methods using stochastic and functional models to counter multipath errors. The paper also provides an overview of filtering techniques for extracting multipath error models from coordinate sequences or observations. Additionally, it introduces the evolution and algorithmic workflow of sidereal filtering (SF) and multipath hemispherical mapping (MHM), from both coordinate and observation domain perspectives. Furthermore, the paper emphasizes the practical significance and research relevance of multipath error processing. It concludes by delineating future research directions in the realm of multipath error mitigation.

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Section: Gnss Deformation Monitoringmentioning

confidence: 99%

GNSS Carrier-Phase Multipath Modeling and Correction: A Review and Prospect of Data Processing Methods

Zhang,

Sun

et al. 2024

Remote Sensing

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“…Establishing observation equations based on the above process, followed by baseline calculation, can maximize the mitigation of multipath effects in carrier phase observations. It is worth mentioning that this method can also be applied to medium-to-long baselines and Network RTK [38]. For example, in Network RTK, accurately calculating the ambiguity, tropospheric delay and ionospheric delay between reference stations can extract multipath errors, establish MHM models to mitigate multipath effects and improve the interpolation accuracy of atmospheric errors.…”

Section: Hemispherical Grid Parameter Fittingmentioning

confidence: 99%

BDS Dual-Frequency Carrier Phase Multipath Hemispherical Map Model and Its Application in Real-Time Deformation Monitoring

Sun

Zhang

Gào

et al. 2023

Sensors

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The BDS multipath delay error is highly related to the surrounding monitoring environment, which cannot be eliminated or mitigated by applying the double difference observation model. In the actual monitoring environment, due to the complexity of the BDS constellation, it is difficult for existing algorithms to consider GEO, IGSO, MEO and other different orbital types of satellites for real-time and efficient multipath error reduction. Therefore, we propose a novel BDS dual-frequency multipath error reduction method for real deformation monitoring for BDS considering various satellite orbit types. This method extracts the single error residual of each satellite based on the assumption of “zero mean” and divides the appropriate grid density of GEO and IGSO/MEO, respectively, to construct a dual-frequency multipath hemispherical map model suitable for BDS satellites with different orbital types. This method can realize the multipath error elimination of the observed values of different orbits and different frequencies. The results of simulation experiments and real deformation monitoring data demonstrate that this method can effectively eliminate low-frequency multipath delay errors in the observation domain and coordinate domain. After multipath correction, the precision of the horizontal coordinates and height coordinates are 1.7 mm and 4.6 mm. The precision of the horizontal coordinate and height coordinate is increased by 50% and 60%, respectively. The fixed rate of ambiguity increased by 5–7%.

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“…To overcome this limitation, relative ionospheric and tropospheric biases must be considered in the functional and stochastic models of RTK. Since ionospheric effects are frequency dependent, the first-order ionospheric errors can be eliminated by using a dual-frequency ionospheric-free (IF) linear combination as a conventional method (Chen et al., 2022). However, fixing the integer ambiguities using the IF combination is difficult, and the noise amplification is higher than in the uncombined model.…”

Section: Introductionmentioning

confidence: 99%

GPS + Galileo + BDS-3 medium to long-range single-baseline RTK: an alternative for network-based RTK?

Ogutcu,

Alcay,

Ozdemir

et al. 2023

J. Navigation

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Thanks to the development of the real-time kinematic (RTK) algorithm and the emerging Global Navigation Satellite System (GNSS), especially for Galileo and BeiDou-3, reliable positioning accuracy for medium and long-baseline RTK became possible globally. Moreover, with the development of the GNSS receiver hardware, baseline length limitations due to radio-based communications are removed thanks to internet-based communication. In this work, single-baseline RTK, incorporated partial ambiguity resolution with troposphere and ionosphere weighting, using GPS (G), Galileo (E), BeiDou-3 (C3) and multi-GNSS (GE and GEC3), is conducted with real GNSS data of EUREF Permanent GNSS network under three different cutoff angles (10°, 20°, and 30°) for six different lengths of baselines (~50, ~150, ~250, ~350, ~450, and ~550 km). The results show that the multi-GNSS RTK solution significantly contributed to the positioning accuracy and convergence time of the single-system RTK solutions. Based on the results, non-available epoch-wise solutions for the high-degree cutoff angles are more obvious for the single-system RTK, whereas multi-GNSS solutions provide 100% solutions for each cutoff angle and baseline. The results indicate that instantaneous and a few epochs single-epoch ambiguity resolution is feasible for 50, 150, 250 and 350 km baseline lengths for multi-GNSS RTK. Based on the positioning results, horizontal–vertical positioning improvements of multi-GNSS RTK (GEC3) compared with the single-system GPS RTK are found as 50%–37%, 40%–35%, 55%–47%, 53%–54%, 57%–49% and 57%–49% for 50, 150, 250, 350, 450 and 550 km, respectively, under a 10° cutoff angle. For 20° and 30° cutoff angles, the accuracy improvements are much higher. The convergence time improvements (n/e/u) of multi-GNSS RTK (GEC3) compared with the single-system GPS RTK are found as 86/92/75%, 77/67/72%, 75/77/83%, 53/56/52%, 69/49/62%, and 52/45/39% for 50, 150, 250, 350, 450 and 550 km, respectively, under a 10° cutoff angle.

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A multipath mitigation method in long-range RTK for deformation monitoring

Cited by 8 publications

References 23 publications

GNSS Carrier-Phase Multipath Modeling and Correction: A Review and Prospect of Data Processing Methods

GNSS Carrier-Phase Multipath Modeling and Correction: A Review and Prospect of Data Processing Methods

BDS Dual-Frequency Carrier Phase Multipath Hemispherical Map Model and Its Application in Real-Time Deformation Monitoring

GPS + Galileo + BDS-3 medium to long-range single-baseline RTK: an alternative for network-based RTK?

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