1,200 Hits in 7.2 sec

Impact of the Initial State on BDS Real-Time Orbit Determination Filter Convergence

Yun Qing, Yidong Lou, Yang Liu, Xiaolei Dai, Yi Cai
2018 Remote Sensing  
This paper mainly focuses on the impact of the initial state (PV and SRP) with different a priori STD on the filter convergence performance of BDS orbit determination in both normal and abnormal periods  ...  This paper focuses on the impact of the initial state with different a priori Standard Deviation (STD) on the BDS orbit convergence performance in both normal and abnormal periods.  ...  Conflicts of Interest: The authors declare no conflict of interest.  ... 
doi:10.3390/rs10010111 fatcat:penglut5jfdppewkp4nfxvblq4

A review of real-time multi-GNSS precise orbit determination based on the filter method

Yidong Lou, Xiaolei Dai, Xiaopeng Gong, Chenglong Li, Yun Qing, Yang Liu, Yaquan Peng, Shengfeng Gu
2022 Satellite Navigation  
With the development of real-time services, real-time Precise Orbit Determination (POD) is indispensable and mainly includes two methods: the ultra-rapid orbit prediction and the real-time filtering orbit  ...  In terms of the convergence time and accuracy of kinematic PPP AR, the better performance of the filter orbit products is validated compared to the ultra-rapid orbit products.  ...  Acknowledgements We thank IGS for providing the GNSS observation data and the MGEX products.  ... 
doi:10.1186/s43020-022-00075-1 fatcat:djif7uuiq5dyzm7hqerzo7pczy

Validation and Assessment of Multi-GNSS Real-Time Precise Point Positioning in Simulated Kinematic Mode Using IGS Real-Time Service

Liang Wang, Zishen Li, Maorong Ge, Frank Neitzel, Zhiyu Wang, Hong Yuan
2018 Remote Sensing  
obtain the real-time precise products of satellite orbits and clocks and to conduct real-time PPP.  ...  The experimental result shows that real-time PPP can achieve a convergence performance of less than 15 min for an accuracy level of 20 cm.  ...  In addition, thanks are given to BKG for providing the real-time data streams and to IGS/GFZ for providing the multi-GNSS precise products.  ... 
doi:10.3390/rs10020337 fatcat:tril53mxezdgzbpzfgzzq2ktb4

Robust Kalman Filter Aided GEO/IGSO/GPS Raw-PPP/INS Tight Integration

Zhouzheng Gao, You Li, Yuan Zhuang, Honglei Yang, Yuanjin Pan, Hongping Zhang
2019 Sensors  
Currently, the real-time kinematic (RTK) based Global Positioning System (GPS) is widely utilized to satisfy such requirements.  ...  Meanwhile, because the quality of BDS geosynchronous Earth orbit (GEO) satellites is much lower than that of inclined geo-synchronous orbit (IGSO) satellites, the predicted observation residual based robust  ...  Conflicts of Interest: The authors declare no conflicts of interest.  ... 
doi:10.3390/s19020417 fatcat:buadcbdxhbdp3dc7kunhzfh2xq

A Real-Time Detection Method for BDS Signal in Space Anomalies

Chun Cheng, Yuxin Zhao, Liang Li, Lin Zhao
2019 Sensors  
Through the statistical characteristics analysis of Signal In Space User Range Error (SISURE), we propose a real-time Instantaneous SISURE (IURE) estimation method by using the Kalman filtering-based carrier-smoothed-code  ...  The experimental results based on 1 Hz data from ground observations show that the proposed method has an estimation accuracy of 1.1 m for BDS IURE.  ...  Conflicts of Interest: The authors declare no conflict of interest.  ... 
doi:10.3390/s19061437 fatcat:lkvoody7rnf6pdma7gw57ald3y

Real-Time Tropospheric Delays Retrieved from Multi-GNSS Observations and IGS Real-Time Product Streams

Cuixian Lu, Xinghan Chen, Gen Liu, Galina Dick, Jens Wickert, Xinyuan Jiang, Kai Zheng, Harald Schuh
2017 Remote Sensing  
The multi-constellation Global Navigation Satellite Systems (GNSS) offers promising potential for the retrieval of real-time (RT) atmospheric parameters to support time-critical meteorological applications  ...  Dependent on the IGS-combined RT satellite orbit/clock products, the European Coordination in Science and Technology (COST) has started to offer the RT zenith total delay (ZTD) products on the basis of  ...  Acknowledgments: Thanks go to the International GNSS service (IGS) for providing multi-GNSS RT data and product streams. Conflicts of Interest: The authors declare no conflict of interest.  ... 
doi:10.3390/rs9121317 fatcat:7figzd5wynfozg22j7fhdwrbyy

Models and performance of SBAS and PPP of BDS

Junping Chen, Yize Zhang, Chao Yu, Ahao Wang, Ziyuan Song, Jianhua Zhou
2022 Satellite Navigation  
In a real-time single- and dual-frequency kinematic positioning test, the positioning errors of all three components can reach 0.5 m within 30 min, and the positioning accuracy after solution convergence  ...  AbstractSatellite Based Augmentation System (SBAS) is one of the services provided by the BeiDou Navigation Satellite System (BDS).  ...  Acknowledgements The authors thank the Institute of Geodesy and Geophysics, Chinese Academy of Sciences for the provision of real-time kinematic multi-GNSS observation data.  ... 
doi:10.1186/s43020-022-00065-3 fatcat:zsivozshbfhdrhsxrgmkzuydci

Assessment of Multiple GNSS Real-Time SSR Products from Different Analysis Centers

Zhiyu Wang, Zishen Li, Liang Wang, Xiaoming Wang, Hong Yuan
2018 ISPRS International Journal of Geo-Information  
The real-time State Space Representation (SSR) product of the GNSS (Global Navigation Satellite System) orbit and clock is one of the most essential corrections for real-time precise point positioning  ...  In this work, the performance of current SSR products from eight analysis centers were assessed by comparing it with the final product and the accuracy of real-time PPP.  ...  Conflicts of Interest: The authors declare no conflict of interest.  ... 
doi:10.3390/ijgi7030085 fatcat:zkpezejyyzbl5bguh4lk6bdb2e

The Impact of Eclipsing GNSS Satellites on the Precise Point Positioning

Xinyun Cao, Shoujian Zhang, Kaifa Kuang, Tianjun Liu, Kang Gao
2018 Remote Sensing  
For the real-time products, as in case of CNES real-time multi-GNSS corrections (, the values are referred to the satellite antenna phase center and only the phase wind-up corrections  ...  Therefore, the impact of GNSS eclipsing satellites on the GNSS PPP needs further analysis, which is also the purpose of this paper.  ...  The process noise of the Kalman filter state is also shown in Table 3 .  ... 
doi:10.3390/rs10010094 fatcat:7ut2fdoxfrbxvfouluji36b2y4

A New Type of 5G-Oriented Integrated BDS/SON High-Precision Positioning

Wenhua Tong, Decai Zou, Tao Han, Xiaozhen Zhang, Pengli Shen, Xiaochun Lu, Pengbo Wang, Ting Yin
2021 Remote Sensing  
By establishing the system state model, and addressing the single-system positioning divergence and insufficient accuracy, a robust adaptive fading filtering (RAF) algorithm based on the prediction residual  ...  China is promoting the construction of an integrated positioning, navigation, and timing (PNT) systems with the BeiDou Navigation Satellite System (BDS) as its core.  ...  initial system state, and real-time variations in the parameter noise can introduce strong uncertainty into the filter model.  ... 
doi:10.3390/rs13214261 fatcat:wj2cmskzovbkldqbdyelflxpj4

Improving Clock Prediction Algorithm for BDS-2/3 Satellites Based on LS-SVM Method

Lina He, Hairui Zhou, Zhiqiang Liu, Yuanlan Wen, Xiufeng He
2019 Remote Sensing  
In the kinematic PPP, the improved model performs much better than the others in terms of both the convergence time and the positioning accuracy.  ...  applied for several real-time precise positioning applications.  ...  ., GFZ, WHU, for providing the MGEX data and clock products for this research. Conflicts of Interest: The authors declare no conflicts of interest.  ... 
doi:10.3390/rs11212554 fatcat:ebxn3kz7dvcihl2mfjadbtaowu

Real-Time BDS-3 Clock Estimation with a Multi-Frequency Uncombined Model including New B1C/B2a Signals

Kaifa Kuang, Jian Wang, Houzeng Han
2022 Remote Sensing  
However, research on real-time BDS-3 clock estimation with multi-frequency signals is quite limited, especially for the new B1C and B2a signals.  ...  Based on the models, simulated real-time numerical experiments with about 80 global IGS (International GNSS Service) network stations are conducted for validation and analysis.  ...  Conflicts of Interest: The authors declare no conflict of interest.  ... 
doi:10.3390/rs14040966 fatcat:3zuxqtl4dvhfnncgp3zfuoxngm

PPP-RTK by means of S-system theory: Australian network and user demonstration

Dennis Odijk, Amir Khodabandeh, Nandakumaran Nadarajah, Mazher Choudhury, Baocheng Zhang, Wei Li, Peter J. G. Teunissen
2016 Journal of Spatial Science  
The PPP-RTK concept extends the precise point positioning (PPP) concept by providing single-receiver users with information enabling integer ambiguity resolution thereby reducing convergence times as compared  ...  In this contribution we present and discuss the underlying principles of the PPP-RTK platform for both network and user.  ...  Acknowledgements The development of Curtin's PPP-RTK Network Platform has been done in the context of the Positioning Program Project 1.19 'Multi-GNSS PPP-RTK Network' of the Cooperative Research Centre  ... 
doi:10.1080/14498596.2016.1261373 fatcat:4oqfj5oiyffkfe2fyw2fcapqj4

Multitarget classification and estimation using clustering techniques

1990 Journal of Guidance Control and Dynamics  
Both the dy- namic models and the measurement functions are nonlinear, and therefore accurate determination of the states of the target in a near-real time computation is difficult to accomplish.  ...  of uncertainty in the initial states.  ... 
doi:10.2514/3.20525 fatcat:x5jmk5cmlbcjxjwnhsobqomkve

Evaluation on the impact of IMU grades on BDS + GPS PPP/INS tightly coupled integration

Zhouzheng Gao, Maorong Ge, Wenbin Shen, You Li, Qijin Chen, Hongping Zhang, Xiaoji Niu
2017 Advances in Space Research  
The unexpected observing environments in dynamic applications may lead to partial and/or complete satellite signal outages frequently, which can definitely impact on the positioning performance of the  ...  also restrained significantly; and (4) the attitude determination accuracy of the PPP/INS integration is highly correlated with the grade of inertial sensor.  ...  41210006, 41429401, and 41574007), the national key research and development program of China (Grant No. 2016YFB0501804).  ... 
doi:10.1016/j.asr.2017.06.022 fatcat:dwsmu2dj25czhmjk33t7e2bqlm
« Previous Showing results 1 — 15 out of 1,200 results