LEO constellation optimization for LEO enhanced global navigation satellite system (LeGNSS)

Ge, Haibo; Li, Bofeng; Nie, Liangwei; Ge, Maorong; Schuh, Harald

doi:10.1016/j.asr.2020.04.031

Cited by 44 publications

(31 citation statements)

References 20 publications

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“…Typically, the satellites with a lower altitude should have a higher inclination than the satellites at a higher orbit altitude in order to be able increase the coverage at both high and low latitudes, e.g. as shown in [11].…”

Section: Discussion On Gdop-based Optimizationmentioning

confidence: 99%

“…Among the above-mentioned complementary techniques, the standalone systems able to achieve the submeter accuracy currently offered by GNSS are the 5G-based and UWB-based solutions, but both have limited coverage and a relatively large energy consumption at the receiver side. In recent years, as more and more effort has been put to develop various Low Earth Orbit (LEO) constellations for communication purposes, researchers have also started to investigate the possibility of using existing LEO signals for PNT purposes as well as of designing novel LEO constellations with good properties for target PNT metrics [7], [8], [9], [10], [11]. For example, in [7] the authors explored how LEO constellations in use for communication purposes can be explored for navigation purpose, based on the premises that LEO satellite signals are received at a much higher power than GNSS signals, due to their closer proximity to Earth, and are thus more capable to penetrate indoors and to offer good coverage in deep urban canyons.…”

Section: Introductionmentioning

confidence: 99%

“…A code-based GDOP optimization for LEO constellations suitable for positioning was also adopted in [11] and the authors proposed a new constellation with 240 satellites distributed in 3 orbital planes at an altitude of 1000 Km and orbital inclinations of 90 • , 60 • , and 35 • , respectively (with higher inclinations orbits offering better coverage at poles and lower inclination orbits offering a greater coverage in equatorial areas). In [11], the target GDOP values of the new constellation were between 2 and 7. There was no comparison with other LEO systems provided in [11].…”

Section: Introductionmentioning

confidence: 99%

“…In [11], the target GDOP values of the new constellation were between 2 and 7. There was no comparison with other LEO systems provided in [11]. As one advantage of LEO satellites is the positioning capability with Doppler measurements, Doppler-based dilution of precision metrics, such as Doppler GDOP (DGDOP) become of interest and have been studied for example in [15].…”

Section: Introductionmentioning

confidence: 99%

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GDOP-based analysis of suitability of LEO constellations for future satellite-based positioning

Ferre

Lohan

Falco

et al. 2020

2020 IEEE International Conference on Wireless for Space and Extreme Environments (WiSEE)

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There are efforts worldwide to build and launch new Low Earth Orbit (LEO) satellites for a multitude of communication and remote-sensing applications. The high number of LEO satellites soon to be available, their relative proximity to Earth compared to GNSS satellites, as well as the potential of Dopplerbased positioning makes these LEO systems good candidates for future positioning solutions, to complement the existing GNSS and terrestrial navigation. LEO systems for Positioning, Navigation, and Time (PNT), briefly referred to as LEO-PNT, can be built either by reusing the existing constellations as signals of opportunity (SoO), or by building new LEO constellations optimized for the positioning purpose. The goal of this paper is to offer a comprehensive comparison in terms of code-based and Doppler-based Geometric Dilution of Precision (GDOP) between existing LEO systems and to discuss the optimization steps to follow in building novel LEO-PNT constellations for best positioning performance. We show that existing broadband LEO constellation with thousands or more satellites are good candidates for SoO in positioning and they can offer close to 100% coverage.

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Section: Discussion On Gdop-based Optimizationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

GDOP-based analysis of suitability of LEO constellations for future satellite-based positioning

Ferre

Lohan

Falco

et al. 2020

2020 IEEE International Conference on Wireless for Space and Extreme Environments (WiSEE)

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show abstract

“…Similar to four-GNSS constellations, the LEO constellation, serving as a navigation system, should satisfy satellite visibility as well as DOP, which is equally distributed as much as possible on a global scale [39]. In this paper, we simulate six LEO constellation schemes in terms of orbital planes and orbital inclinations to study the distribution of LEO satellites.…”

Section: Leo-augmented Four-gnssmentioning

confidence: 99%

Satellite Availability and Service Performance Evaluation for Next-Generation GNSS, RNSS and LEO Augmentation Constellation

Cui

Zhang

2021

Remote Sensing

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Positioning accuracy is affected by the combined effect of user range errors and the geometric distribution of satellites. Dilution of precision (DOP) is defined as the geometric strength of visible satellites. DOP is calculated based on the satellite broadcast or precise ephemerides. However, because the modernization program of next-generation navigation satellite systems is still under construction, there is a lack of real ephemerides to assess the performance of next-generation constellations. Without requiring real ephemerides, we describe a method to estimate satellite visibility and DOP. The improvement of four next-generation Global Navigation Satellite Systems (four-GNSS-NG), compared to the navigation constellations that are currently in operation (four-GNSS), is statistically analyzed. The augmentation of the full constellation the Quasi-Zenith Satellite System (7-QZSS) and the Navigation with Indian Constellation (11-NavIC) for regional users and the low Earth orbit (LEO) constellation enhancing four-GNSS performance are also analyzed based on this method. The results indicate that the average number visible satellites of the four-GNSS-NG will reach 44.86, and the average geometry DOP (GDOP) will be 1.19, which is an improvement of 17.3% and 7.8%, respectively. With the augmentation of the 120-satellite mixed-orbit LEO constellation, the multi-GNSS visible satellites will increase by 5 to 8 at all latitudes, while the GDOP will be reduced by 6.2% on average. Adding 7-QZSS and 11-NavIC to the four-GNSS-NG, 37.51 to 71.58 satellites are available on global scales. The average position DOP (PDOP), horizontal DOP (HDOP), vertical DOP (VDOP), and time DOP (TDOP) are reduced to 0.82, 0.46, 0.67 and 0.44, respectively.

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LEO augmented precise point positioning using real observations from two CENTISPACE™ experimental satellites

Li,

Yang,

et al. 2023

GPS Solut

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LEO constellation optimization for LEO enhanced global navigation satellite system (LeGNSS)

Cited by 44 publications

References 20 publications

GDOP-based analysis of suitability of LEO constellations for future satellite-based positioning

GDOP-based analysis of suitability of LEO constellations for future satellite-based positioning

Satellite Availability and Service Performance Evaluation for Next-Generation GNSS, RNSS and LEO Augmentation Constellation

LEO augmented precise point positioning using real observations from two CENTISPACE™ experimental satellites

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