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Development trends of the national secure PNT system based on BDS

SCIENCE CHINA-EARTH SCIENCES (2023)

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Summary: The distances between seafloor stations derived from acoustic measurements are more accurate than those derived from sea surface vessel transducers. Systematic errors in acoustic measurements, such as acoustic ray bending and sound speed variation, can significantly affect the accuracy of vertical coordinates. By constructing a refined observation model, the impact of these errors can be mitigated and the position accuracy of seafloor stations can be improved.

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Summary: A refined resilient model, including temporal and horizontal variations, was constructed to improve the accuracy of underwater acoustic positioning. The temporal and spatial variations of sound speed were calculated using the integrated estimation method and the stepwise estimation method. The results showed significant variations in sound speed in different water areas, with periodicity and negative gradient in the horizontal direction. The precision of the coordinates improved by about 28% when considering temporal and spatial variations in the sound speed model. The study also found high coordinate accuracy in the vertical direction.

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Principle and performance of BDSBAS and PPP-B2b of BDS-3

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Summary: This paper introduces the basic technical framework and performance of the BeiDou Global Navigation Satellite System (BDS-3) Satellite-Based Augmentation System (BDSBAS) and Precise Point Positioning (PPP-B2b), discusses their similarities and differences, and analyzes their limitations. The study shows that co-construction of BDSBAS and PPP-B2b is feasible, and strategies for infrastructure sharing and correction broadcasting are proposed.

SATELLITE NAVIGATION (2022)

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BeiDou-3 broadcast clock estimation by integration of observations of regional tracking stations and inter-satellite links

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Summary: The BeiDou navigation satellite system improves the broadcast clock accuracy of BDS-3 through ISL technology and centralized estimation, while significantly reducing reliance on the ground segment.

GPS SOLUTIONS (2021)

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Summary: This study focuses on the acoustic positioning of seafloor geodetic networks in complex ocean environments, proposing a new observational model and achieving satisfactory results in a real deployment.

JOURNAL OF GEODESY (2021)

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Indoor navigation: state of the art and future trends

Naser El-Sheimy et al.

Summary: This paper reviews the current status and future trends of indoor Positioning, Localization, and Navigation (PLAN), covering the requirements, main players, sensors, and techniques for indoor PLAN. It highlights the importance of environmental perception sensors such as HD map, LiDAR, camera, 5G, and IoT signals in enhancing the intelligence and robustness of PLAN systems under the integration of advanced sensors, multi-platform/device/sensor fusion, self-learning systems, and AI, 5G, IoT, and edge/fog computing.

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Comparing satellite orbit determination by batch processing and extended Kalman filtering using inter-satellite link measurements of the next-generation BeiDou satellites

Xia Ren et al.

GPS SOLUTIONS (2019)

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A TOA/AOA Underwater Acoustic Positioning System Based on the Equivalent Sound Speed

Mingzhen Xin et al.

JOURNAL OF NAVIGATION (2018)

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Progress and performance evaluation of BeiDou global navigation satellite system: Data analysis based on BDS-3 demonstration system

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SCIENCE CHINA-EARTH SCIENCES (2018)

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JOURNAL OF GEODESY (2001)

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