Simulation Analysis of LEO Constellation Augmented GNSS (LeGNSS) Zenith Troposphere Delay and Gradients Estimation

Zhang, Pengfei; Ding, Wenwu; Qu, Xiaochuan; Yuan, Yunbin

doi:10.1109/tgrs.2023.3241956

Cited by 2 publications

(3 citation statements)

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“…We first calculated the distance between the satellite and the receiver and then added a series of observation errors to form the simulated observation data. To simulate the observations more reliably, all observation errors from equation (1) were considered in the real GNSS observation data processing [35]. The simulation datasets were collected for 24 h on 1 January 2022, with a sampling interval of 30 s. The number of visible GPS and BDS satellites is shown in figure 3.…”

Section: Simulation Testmentioning

confidence: 99%

“…The effect of the number of common-antenna-based boards was simulated from 1 to 4. To simulate different types of receivers from high-grade to low-cost levels, the varying STDs of the code measurements are set to ranging from 0.1 m to 2 m with an interval of 0.1 m, The corresponding STDs of carrier phase measurements are set to 0.01 times of the code measurements [35,36]. The float solutions, including the baseline and ambiguity parameters, were calculated using equation ( 4 As shown in figure 5, as the STDs of the measurements increase, the accuracy of the float solutions gradually deteriorates, and this tendency has nothing to do with the number of boards.…”

Section: Simulation Testmentioning

confidence: 99%

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Improving ambiguity resolution with common-antenna-based dual-board receiver for low-cost real-time kinematic positioning

Jia,

Zou,

Yang

2023

Meas. Sci. Technol.

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Ambiguity resolution is of critical importance to the carrier phase-based real-time kinematic (RTK) positioning method. Improving the accuracy of float ambiguities is beneficial for achieving ambiguity resolution. However, the large measurement noise from low-cost receivers will worsen the estimation accuracy of float ambiguities, which affects the ambiguity resolution performance. In this contribution, to reduce the influence of large measurement noise on ambiguity resolution for low-cost receivers, an improved RTK method for ambiguity resolution is proposed to enhance the accuracy of float ambiguities by equipping the rover receiver with common-antenna-based dual GNSS boards instead of only one GNSS board. First, the dual-board design can increase the measurement redundancy of the same frequency to suppress the measurement noise. Second, because the common-antenna design can form a moving zero-baseline between the dual GNSS boards, the ambiguities between them can be easily fixed. Known fixed ambiguities can be used as constraints to strengthen the positioning model. Simulation and real-world static and kinematic experiments were conducted to test the proposed method. The results demonstrate that the proposed method can improve the accuracy of float ambiguities by increasing the redundancy of the measurements and introducing the constraints of the ambiguities, and the improved accuracy is about 20 %. Compared with the traditional single-board RTK method, better ambiguity resolution performance can be achieved by taking advantage of the proposed common-antenna-based RTK method.

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Section: Simulation Testmentioning

confidence: 99%

Section: Simulation Testmentioning

confidence: 99%

Improving ambiguity resolution with common-antenna-based dual-board receiver for low-cost real-time kinematic positioning

Jia,

Zou,

Yang

2023

Meas. Sci. Technol.

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show abstract

“…Pseudorange and carrier phase observations are the basic measurements used for positioning in most navigation systems. These measurements are subject to various errors during signal propagation, such as atmospheric delay, ionospheric delay, and multipath effects [7][8][9][10]. Reasonably eliminating or reducing the effects of these errors can effectively improve the positioning accuracy [11][12][13][14].…”

Section: Introductionmentioning

confidence: 99%

The Extraction and Characterization of Pseudorange Multipath Based on BDS-3 Multi-Frequency Observations

Guo

et al. 2023

Sensors

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Global Navigation Satellite System (GNSS) observations are subject to various errors during their propagation process. A reasonable correction of these errors can improve the positioning, navigation, and timing (PNT) service capability. The impact of multipaths on pseudorange observations can reach a decimeters or even meters level. However, their mechanism is complex and there is currently no universally accepted high-precision correction model. The correlation between the pseudorange multipaths (MP) of BDS-2 satellites and satellite elevation has been confirmed, while there have been fewer analyses of the MP characteristics for different frequencies of BDS-3 satellites. The broadcasting of multi-frequency observations in BDS-3 should theoretically make the extracted MP more accurate compared to traditional methods. Based on this, in this contribution, a multi-frequency MP extraction algorithm based on the least squares principle is proposed, which can simultaneously eliminate the influence of higher-order ionospheric delay. The analytical expression for only eliminating first-order ionospheric delay is successfully derived. Subsequently, the characteristics of the MPs extracted from different frequency combinations and the impact of combination noise on the extraction accuracy are discussed. The influence of second-order ionospheric delay on the MPs for each frequency under different combination noises, as well as the periodic behavior exhibited in long-term observations of the BDS-3 medium earth orbit (MEO) and inclined geosynchronous orbit (IGSO) satellites, are also analyzed. Finally, the correlations between the MPs of each frequency of BDS satellite and elevation are quantitatively analyzed based on observations from 35 stations. Overall, this work has positive implications for the study of the MP characteristics of BDS-3 and subsequent modeling efforts.

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Simulation Analysis of LEO Constellation Augmented GNSS (LeGNSS) Zenith Troposphere Delay and Gradients Estimation

Cited by 2 publications

References 56 publications

Improving ambiguity resolution with common-antenna-based dual-board receiver for low-cost real-time kinematic positioning

Improving ambiguity resolution with common-antenna-based dual-board receiver for low-cost real-time kinematic positioning

The Extraction and Characterization of Pseudorange Multipath Based on BDS-3 Multi-Frequency Observations

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