The Preliminary Results for Five-System Ultra-Rapid Precise Orbit Determination of the One-Step Method Based on the Double-Difference Observation Model

Ye, Fei; Yuan, Yunbin; Tan, Bingfeng; Deng, Zhiguo; Ou, Junfei

doi:10.3390/rs11010046

Cited by 6 publications

(6 citation statements)

References 39 publications

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“…Thus far, the GNSS Double Difference (DD) network has been extensively used, including for producing precise satellite orbits (Alhamadani 2018;Ye et al 2019), maintaining coordinate frame, and calculating earth rotation parameters (Zajdel et al 2019). Most of these comply with the conventional OBS-MAX and SHORTEST experimental strategies, although both of these conventional methods exhibit defects.…”

Section: Introductionmentioning

confidence: 99%

Optimal Independent Baseline Searching for Global GNSS Networks

Liu

Nie

et al. 2021

J. Surv. Eng.

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An n-station continuously operated global navigation satellite system (GNSS) network contains n-1 independent baselines. Baseline structure is critical to positioning accuracy, and the final result is dependent on the baseline selection strategies. The baseline length and amount of common observations are the primary principles for baseline selection. However, there are few discussions about the optimal strategy to determine the independent baseline of a huge GNSS network. To enhance the performance of the multibaseline solution, a comparison is drawn between the conventional method and a weighting strategy. Observations from continuous stations distributed globally within the International GNSS Service (IGS) are explored. At first, two conventional principles for baseline selection are tested. Subsequently, a weightingschemeisdevelopedtoexploit thesetwo strategies. The enhanced method improves nearly 10% external accuracy compared with the classical methods, which can be verified from the experiment on January 1, 2012. Lastly, the network experiment is extended to the whole year of 2012 to increase statistical significance. It is therefore revealed that the novel weighting strategy (WEIGHT), with an equal chance of two conventional strategies, mitigates 0.4%-3.0% three-dimensional (3D) coordinate error of the whole year. Also, an analysis of the probability of gross errors indicates that WEIGHT exhibits better performance. Unlike the conventional view, it is shown that a proper weight of OBS-MAX and SHORTEST could form a better coordinate calculation result and a lower gross error rate. In conclusion, these experiments suggest a proposed method that synthetically considers the length of total stations and the total number of observations, and it is verified that WEIGHT is a better choice for searching independent baselines

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Section: Introductionmentioning

confidence: 99%

Optimal Independent Baseline Searching for Global GNSS Networks

Liu

Nie

et al. 2021

J. Surv. Eng.

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“…1 Although the IGS has not yet provided combined GPS/GLONASS satellite ultra-rapid orbit products, some IGS analysis centers (ACs) have developed and providedultra-rapid orbit products from a single GPS satellite to a GPS/GLONASS dual system 2 [9][10][11]. With the establishment and development of the multi-GNSS Experiment (MGEX), the precise orbit determination of multi-GNSS satellites based on the one-step method [12][13][14] has become one of the IGS's top research priorities. 3 Currently, the key methods to improve the accuracy of the GNSS satellites' ultra-rapid orbits are as follows: (1) shortening the time interval for updating the ultra-rapid orbit, such as from 6 to 3 h, or even to 1 h [5,7,15]; (2) improving the models and strategies for precise orbit determination (POD), such as the attitude and solar radiation pressure (SRP) model, or choosing the 'one-step method' and 'two-step method' separately [16][17][18]; (3) optimizing the distribution of reference stations for POD [19]; (4) improving the accuracy of shortterm predictions of earth rotation parameters (ERPs) [20];…”

Section: Introductionmentioning

confidence: 99%

“…Although some MGEX ACs are testing ultra-rapid orbit products of additional systems to provide stable and reliable products for multi-GNSS users in the future, there are relatively few analyses determining the multi-GNSS satellites' ultra-rapid orbits based on the one-step method. In particular, there are few studies on the impact analysis of the prediction strategy and of the optimum arc length of quad-constellation (GPS, GLONASS, Galileo, and BeiDou-2 (BDS)) medium earth orbit (MEO) satellites 4 [12]. It is well known that the key to determining the ultrarapid orbits of GNSS satellites is to use a known precise orbit arc to fit the initial state of the satellite as well as other information such as the SRP [23], or to directly calculate the initial state of the satellite and other information according to the observations of a certain arc length, and subsequently to use numerical integration to obtain the predicted orbits [12,21].…”

Section: Introductionmentioning

confidence: 99%

“…In particular, there are few studies on the impact analysis of the prediction strategy and of the optimum arc length of quad-constellation (GPS, GLONASS, Galileo, and BeiDou-2 (BDS)) medium earth orbit (MEO) satellites 4 [12]. It is well known that the key to determining the ultrarapid orbits of GNSS satellites is to use a known precise orbit arc to fit the initial state of the satellite as well as other information such as the SRP [23], or to directly calculate the initial state of the satellite and other information according to the observations of a certain arc length, and subsequently to use numerical integration to obtain the predicted orbits [12,21]. Presently, in order to better match the corresponding ultra-rapid orbit determination algorithms and strategies, some IGS ACs are using different orbit arc lengths to provide their ultra-rapid orbit products for the GPS satellites, e.g.…”

Section: Introductionmentioning

confidence: 99%

“…The current status quo exhibits limited research on the analysis of the impact of orbit arc length on the ultra-rapid orbit determinations of quad-constellation MEO satellites based on the one-step method. Considering the potential advantages of the one-step method [5,12] and considering that the IGS MGEX encourages each AC to achieve multi-GNSS POD based on this method, our goal is to determine an optimal orbit arc length that will contribute to the quad-constellation ultrarapid orbit determination. Therefore, in this study, the impact of orbit arc length on quad-constellation MEO satellites' ultrarapid orbit determinations based on the one-step method was analyzed to provide a beneficial reference for the one-step method software platform and improve the accuracy and overall stability of quad-constellation MEO satellites' ultra-rapid orbit determination.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Impact analysis of arc length in multi-GNSS ultra-rapid orbit determination based on the one-step method

Ye¹,

Yuan²,

Bao-Cheng³

2020

Meas. Sci. Technol.

Self Cite

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With the development of near real-time and real-time high-precision global navigation satellite system (GNSS) applications, users’ requirements for the accuracy and stability of ultra-rapid orbits have increased, especially for multi-constellation orbits. Generally, several factors affect the accuracy and stability of multi-GNSS ultra-rapid orbit determination; however, this study is focused only on analyzing the orbit arc length of ultra-rapid orbits of the GPS, GLONASS, BeiDou-2, and Galileo satellites based on the one-step method. To realize nearly ideal conditions in the process of analysis, one full year’s rapid orbit products during 2018 provided by the GeoForschungsZentrum multi-GNSS experiment analysis center were used as fitted observed orbits and also as a reference orbit for comparison to the predicted orbit. In terms of residual analysis of orbit difference and stability analysis of Helmert transformation parameters, the numerical results showed that the optimal orbit arc lengths of quad-constellation medium earth orbit (MEO) satellites for 6 h and 3 h predicted ultra-rapid orbits based on the one-step method were in the range of 44–45 h and 41–44 h, respectively. Overall, for both 6 h and 3 h predictions, when only considering the impact of the orbit arc length on the accuracy and stability of the orbit itself, 44 h can be considered as the overlapping optimal orbit arc length of quad-constellation MEO satellitesʼ ultra-rapid orbits generated by the one-step method. In addition, these ranges of orbit arc length can contribute to the multi-GNSS ultra-rapid orbit determination.

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Real-time carrier observation quality control algorithm for precision orbit determination of LEO satellites

Xiao

Liu

et al. 2022

GPS Solut

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The Preliminary Results for Five-System Ultra-Rapid Precise Orbit Determination of the One-Step Method Based on the Double-Difference Observation Model

Cited by 6 publications

References 39 publications

Optimal Independent Baseline Searching for Global GNSS Networks

Optimal Independent Baseline Searching for Global GNSS Networks

Impact analysis of arc length in multi-GNSS ultra-rapid orbit determination based on the one-step method

Real-time carrier observation quality control algorithm for precision orbit determination of LEO satellites

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