An optimal design of the broadcast ephemeris for LEO navigation augmentation systems

Guo, Xueli; Wang, Lei; Fu, Wenli; Suo, Yingbo; Chen, Ruizhi

doi:10.1080/10095020.2021.2017760

Cited by 14 publications

(12 citation statements)

References 19 publications

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“…In addition, the legacy messages of MEO orbit are described by arcs of two hours length. However, the authors in [110]- [112] have found reasonable accuracy only when describing LEO orbits with 20 to 30 min arc lengths.…”

Section: Ephemeridesmentioning

confidence: 99%

Position, Navigation, and Timing (PNT) Through Low Earth Orbit (LEO) Satellites: A Survey on Current Status, Challenges, and Opportunities

et al. 2022

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More and more satellites are populating the sky nowadays in the Low Earth orbits (LEO). Most of the targeted applications are related to broadband and narrowband communications, Earth observation, synthetic aperture radar, and internet-of-Things (IoT) connectivity. In addition to these targeted applications, there is yet-to-be-harnessed potential for LEO and positioning, navigation, and timing (PNT) systems, or what is nowadays referred to as LEO-PNT. No commercial LEO-PNT solutions currently exist and there is no unified research on LEO-PNT concepts. Our survey aims to fill the gaps in knowledge regarding what a LEO-PNT system entails, its technical design steps and challenges, what physical layer parameters are viable solutions, what tools can be used for a LEO-PNT design (e.g., optimisation steps, hardware and software simulators, etc.), the existing models of wireless channels for satellite-toground and ground-to-satellite propagation, and the commercial prospects of a future LEO-PNT system. A comprehensive and multidisciplinary survey is provided by a team of authors with complementary expertise in wireless communications, signal processing, navigation and tracking, physics, machine learning, Earth observation, remote sensing, digital economy, and business models.

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Section: Ephemeridesmentioning

confidence: 99%

Position, Navigation, and Timing (PNT) Through Low Earth Orbit (LEO) Satellites: A Survey on Current Status, Challenges, and Opportunities

et al. 2022

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“…These elements consist of the semimajor axis a , eccentricity e , inclination i , longitude of the ascending node  , the argument of perigee  , and the mean anomaly M respectively. However, when the eccentricity nears zero, it becomes increasingly difficult to distinguish between the argument of perigee and the mean anomaly, leading to the loss of the original physical significance of the argument of perigee and a strong correlation between these two parameters [9] . This correlation can create an ill-posed problem during the fitting process.…”

Section: Non-singular Elementsmentioning

confidence: 99%

“…Table 1 enumerates the GNSS broadcast ephemeris parameters, while Table 2 presents potential additional parameters. A more detailed discussion on the user algorithm for the LEO broadcast ephemeris can be found in [9]. Amplitude of harmonic correction term to the orbit radius…”

Section: Spectral Analysis Of Orbit Elementsmentioning

confidence: 99%

“…These coefficients represent the dominant periodic terms' corrections of r and u . This strong correlation between these pairs of parameters might induce an ill-posed problem in the fitting algorithm, leading to iterative divergence [9] . 2 shows results for different orbital altitudes ranging from 400 to 1400 km, with a set eccentricity and inclination of 0.001 and 45°, respectively.…”

Section: Optimal Parameter Selection For Leo Broadcast Ephemerismentioning

confidence: 99%

“…They evaluated three enhanced ephemeris models: 18-parameter, 20-parameter, and 22-parameter, with the 20-parameter model being recommended based on simulation results. Guo et al proposed a 21parameter LEO broadcast ephemeris model, which is based on predicted orbits to circumvent overly optimistic appraisals of real-time LEO broadcast ephemeris [9] . This model resulted in an 87.3% improvement in fitting accuracy compared to the conventional 16-parameter model for GNSS satellites.…”

Section: Introductionmentioning

confidence: 99%

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Developing and validating an optimized 19-parameter broadcast ephemeris model for LEO satellites

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et al. 2024

Fifth International Conference on Geoscience and Remote Sensing Mapping (ICGRSM 2023)

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Augmentation message design for LEO-enhanced precise positioning: In-orbit performance assessment

Chang,

Zhao,

et al. 2025

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An optimal design of the broadcast ephemeris for LEO navigation augmentation systems

Cited by 14 publications

References 19 publications

Position, Navigation, and Timing (PNT) Through Low Earth Orbit (LEO) Satellites: A Survey on Current Status, Challenges, and Opportunities

Position, Navigation, and Timing (PNT) Through Low Earth Orbit (LEO) Satellites: A Survey on Current Status, Challenges, and Opportunities

Developing and validating an optimized 19-parameter broadcast ephemeris model for LEO satellites

Augmentation message design for LEO-enhanced precise positioning: In-orbit performance assessment

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