Mon Oct 13, F. Flechtner
• Sorted by Date • Sorted by Last Name of First Author •
Liu, Dongzhu, Su, Xing, Xie, Xin, Zhou, Han, and Qu, Zhengjian, 2025. Study on the Design of Broadcast Ephemeris Parameters for Low Earth Orbit Satellites. Remote Sensing, 17(16):2894, doi:10.3390/rs17162894.
• from the NASA Astrophysics Data System • by the DOI System •
@ARTICLE{2025RemS...17.2894L,
author = {{Liu}, Dongzhu and {Su}, Xing and {Xie}, Xin and {Zhou}, Han and {Qu}, Zhengjian},
title = "{Study on the Design of Broadcast Ephemeris Parameters for Low Earth Orbit Satellites}",
journal = {Remote Sensing},
keywords = {LEO satellite navigation, broadcast ephemeris, Kepler ephemeris model, least squares estimation, ephemeris message size, GNSS},
year = 2025,
month = aug,
volume = {17},
number = {16},
eid = {2894},
pages = {2894},
abstract = "{The integration of low Earth orbit (LEO) satellite constellations into
the Global Navigation Satellite System (GNSS) has emerged as a
prominent research focus, as LEO satellites can significantly
enhance the precision of GNSS positioning, navigation, and
timing (PNT) services. In the design of LEO navigation
constellations, the development of an efficient broadcast
ephemeris model is critical for delivering high-accuracy
navigation solutions. This study extends the conventional
16-parameter Keplerian broadcast ephemeris model by proposing
enhanced 18-, 20-, 22-, and 24-parameter models, ensuring
compatibility with existing GNSS ephemeris standards. The
performance of these models was evaluated using precise science
orbit from five satellites at varying altitudes, ranging from
320 km to 1336 km. By analyzing fitting errors, Signal-in-Space
Range Error (SISRE), and Message Size Bits (MSB) across
different fitting arc durations and parameter counts, the
optimal model configuration was identified. The results
demonstrate that the 22-parameter model, which was constructed
by augmenting the standard 16-parameter ephemeris with (aË™, nË™,
Crs3, Crc3, Crs1, Crc1) delivers the best balance of accuracy
and efficiency. With a fitting arc length of 20 min, the SISRE
for the GRACE-A (320 km), GRACE-C (475 km), Sentinel-2A (786
km), HY-2A (966 km), and Sentinel-6A (1336 km) satellites were
measured at 8.88 cm, 6.21 cm, 2.87 cm, 2.11 cm, and 0.75 cm,
respectively. Meanwhile, the corresponding MSB remained compact
at 501, 490, 491, 487, and 476 bits. These findings confirm that
the proposed 22-parameter broadcast ephemeris model meets the
stringent accuracy requirements for next-generation LEO-
augmented GNSSs, paving the way for enhanced global navigation
services.}",
doi = {10.3390/rs17162894},
adsurl = {https://ui.adsabs.harvard.edu/abs/2025RemS...17.2894L},
adsnote = {Provided by the SAO/NASA Astrophysics Data System}
}
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