In GNSS-based navigation onboard Low Earth Orbit (LEO) satellites, typical accuracy requirements are 10 cm and 0.1 mm/s for 3D position velocity, respectively. Previous works have shown that such performance is achieved by including Galileo measurements in the estimation process. Here, we aim to evaluate impact of employing State Space Representation (SSR) corrections, i.e., GNSS satellite orbi...

The space industry is currently at a significant inflection point. New economies are forming in lowEarth orbit (LEO), driven by miniaturization of technologies and the promise of lower launch costs, which should then allow many of these LEO systems to capitalize on designs incorporating smaller, shorter-lived spacecraft in highly-disaggregated constellations. Meanwhile, many spacecraft at geosy...

Low Earth Orbit (LEO) satellite navigation signal can be used as an opportunity in the case of a Global Navigation Satellite System (GNSS) outage, or enhancement by means traditional GNSS positioning algorithms. No matter which service mode is used, acquisition prerequisite for providing enhanced LEO services. Compared with medium orbit satellite, transit time shorter. Thus, it great significan...

A set of Global Navigation Satellite Systems (GNSS) satellite orbit and clock offset are an essential prerequisite for precise application. However, abrupt changes in accuracy at the boundaries prevalent products provided by international GNSS services, resulting decreased interpolation precision near daily boundary. In addition, effect this phenomenon is reflected deterioration fluctuations su...

Abstract The differential code biases (DCBs) of the global positioning system (GPS) receiver onboard low-Earth orbit (LEO) satellites are commonly estimated by a local spherical symmetry assumption together with known GPS satellite DCBs from ground-based observations. Nowadays, more and LEO equipped receivers for precise determination, which provides unique chance to estimate both without any g...

We present a spectroscopic study of Leo V, a recently discovered satellite of the Milky Way (MW). From stellar spectra obtained with the MMT/Hectochelle spectrograph we identify seven likely members of Leo V. Five cluster near the Leo V center (R < 3) and have velocity dispersion 2.4 −1.4 km s. The other two likely members lie near each other but far from the center (R ∼ 13 ∼ 700 pc) and inflat...

We introduce an approach for the direct measurement of gravitational potential (GP) along trajectory a satellite, with specific focus on Low-Earth Orbit (LEO) satellites. A LEO satellite communicates several Geosynchronous Equatorial (GEO) satellites via frequency signal links. The GP difference can be measured in real-time using shift by equipping both and GEO precise atomic clocks. Since at h...

Satellite network is the essential part of the future generation of hybrid communication networks. Considering the surging demands for multimedia traffic across the globe, the dynamic time-varying topology of low earth orbit (LEO) satellite network and the flaws of existing QoS (Quality of Service) routing algorithms, a novel QoS routing algorithm applying multi-agent system (MAQR) for LEO sate...

Introduction: The Long Duration Exposure Facility (LDEF) satellite was flown in Low Earth Orbit (LEO) for a duration of 69 months from 1984 through 1990 [1]. Its main mission was to study the effects of the space environment on a variety of exposed surfaces, but it also carried experiments dedicated to the capture of impacting particles, which included not only cosmic dust, but also a significa...

Autonomous, anti-jamming, and high-precision satellite navigation are of great importance to current future space technologies. This paper proposes a cooperative constellation system for low Earth orbit (LEO) satellites that use only the optical measurements satellites. Based on photometry, an transmission link model is built. With pixel coordinates images, line sight (LoS) vectors with respect...