Fuzzy weighting approach for single point positioning with single-frequency pseudo-range observations

Fan, Chen; Qin, Guan; Zhu, Zhengping; Peng, Fei; Xiang, Wei

doi:10.1016/j.asr.2018.03.027

Cited by 5 publications

(2 citation statements)

References 34 publications

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“…When applied with observations collected at reference stations of a global or regional network, GPS single point positioning with navigation data is able to provide positioning accuracy of 5-10 m, which may worsen with lowcost GNSS receivers [5][6][7]. Therefore, a great number of efforts, including regional atmospheric and satellite clock corrections [8,9], optimized measurement weights [10] or integration of multi-constellation [11] have recently been made to improve the performance of single-frequency positioning.…”

Section: Introductionmentioning

confidence: 99%

Real-time single-frequency multi-GNSS positioning with ultra-rapid products

Bahadur

Nohutçu

2020

Meas. Sci. Technol.

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Ultra-rapid products, which do not require any external connection unlike real-time services, are an important alternative for real-time global navigation satellite system (GNSS) applications. Especially, the inclusion of newly-emerged satellite systems in ultra-rapid products opens up considerable opportunities to improve the positioning performance. In this regard, this study concentrates on the employment of the most recent ultra-rapid products besides traditional ones for real-time single-frequency multi-GNSS positioning using code and carrier phase measurements. In the study, experimental tests were conducted for the ionosphere-free code-carrier combination to evaluate the performance of single-receiver single-frequency positioning. The results reveal that single-frequency positioning is able to provide sub-meter level positioning accuracy with ultra-rapid products despite its performance alters depending on the applied product. Also, the performance of single-frequency positioning which based on code-carrier combination is not influenced significantly from the possible decline in the precision of ultra-rapid products over time due to the convergence of phase ambiguities. On the other hand, the results demonstrate that the accuracy of pseudorange positioning can significantly be improved with the integration of multi-constellation and the improvement ratio can reach 30% compared with the GPS-only solutions. Furthermore, the convergence time of GPS-only solution can be decreased by a ratio of 37% on average with multi-GNSS combinations. Finally, the results show that for the multi-constellation analyses, the solutions which utilize the ultra-rapid product of Wuhan University provide the best performance in terms of positioning accuracy and convergence time.

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Section: Introductionmentioning

confidence: 99%

Real-time single-frequency multi-GNSS positioning with ultra-rapid products

Bahadur

Nohutçu

2020

Meas. Sci. Technol.

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“…Nonetheless, to achieve optimum performance with single-frequency positioning solutions, their typical problems, such as mitigation of ionospheric effect and the higher noise level of measurements, must be handled appropriately. For this reason, several attempts have been made to overcome these drawbacks and therefore acquire better positioning performance from single-frequency positioning solutions (Ning et al, 2018;Fan et al, 2019;Li et al, 2019;Zheng et al, 2020). Furthermore, the fundamental requirement of single-frequency GNSS applications is to achieve real-time positioning results.…”

Section: Introductionmentioning

confidence: 99%

Real-time single-frequency precise positioning with Galileo satellites

Bahadur

2021

J. Navigation

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Following substantial progress achieved recently, the Galileo constellation provides a considerable satellite resource for the GNSS applications. In this regard, the performance assessment of real-time single-frequency precise positioning with Galileo satellites is the main objective of this research. For this purpose, several experimental tests were conducted in this study with two single-frequency positioning models, namely single-frequency code-based positioning and code-phase combination. The results show that Galileo presents an adequate number of visible satellites sufficient for single-frequency positioning. Also, the study demonstrates that, in comparison to GPS observations, Galileo observations have a significantly lower noise level. For the single-frequency code-based positioning, Galileo presents a better positioning accuracy than GPS by 25⋅8% on average. When compared with GPS, a 9⋅4% better positioning accuracy is acquired from Galileo for the single-frequency code-phase combination, with its average convergence time shorter than GPS by a ratio of 24⋅4%.

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Integration of variance component estimation with robust Kalman filter for single-frequency multi-GNSS positioning

Bahadur

Nohutçu

2021

Measurement

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Fuzzy weighting approach for single point positioning with single-frequency pseudo-range observations

Cited by 5 publications

References 34 publications

Real-time single-frequency multi-GNSS positioning with ultra-rapid products

Real-time single-frequency multi-GNSS positioning with ultra-rapid products

Real-time single-frequency precise positioning with Galileo satellites

Integration of variance component estimation with robust Kalman filter for single-frequency multi-GNSS positioning

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