Geocentric orbit
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Low Earth Orbit Satellite Security and Reliability: Issues, Solutions, and the Road Ahead Open
Low Earth Orbit (LEO) satellites undergo a period of rapid development driven by ever-increasing user demands, reduced costs, and technological progress. Since there is a lack of literature on the security and reliability issues of LEO Sat…
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A Review of the Space Environment Effects on Spacecraft in Different Orbits Open
The space environment consists of various complex phenomena, which could have a strong influence on the spacecraft operation in different aspects. Since the very beginning of space exploration, numerous studies have been done on the space …
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A 30‐Year Simulation of the Outer Electron Radiation Belt Open
As society becomes more reliant on satellite technology, it is becoming increasingly important to understand the radiation environment throughout the Van Allen radiation belts. Historically most satellites have operated in low Earth orbit …
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Handover Solutions for 5G Low-Earth Orbit Satellite Networks Open
Low-Earth orbit (LEO) satellite networks are meant to be fundamental to closing the digital divide, enabling new market opportunities and providing fifth-generation (5G) New Radio (NR) connectivity everywhere at any time. Despite the advan…
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Mission to Earth–Moon Lagrange Point by a 6U CubeSat: EQUULEUS Open
EQUULEUS (EQUilibriUm Lunar-Earth point 6U Spacecraft) will be the world's smallest spacecraft to explore the Earth-Moon Lagrange point. It is being jointly developed by JAXA (Japan Aerospace Exploration Agency) and the University of Tokyo…
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Low cost satellite constellations for nearly continuous global coverage Open
Satellite services are fundamental to the global economy, and their design reflects a tradeoff between coverage and cost. Here, we report the discovery of two alternative 4-satellite constellations with 24- and 48-hour periods, both of whi…
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Space Weather Modeling Capabilities Assessment: Neutral Density for Orbit Determination at low Earth orbit Open
The specification and prediction of density changes in the thermosphere is a key challenge for space weather observations and modeling, because it is one result of complex interactions between the Sun and the terrestrial atmosphere and als…
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Versatile On-Orbit Servicing Mission Design in Geosynchronous Earth Orbit Open
Covers advancements in spacecraft and tactical and strategic missile systems, including subsystem design and application, mission design and analysis, materials and structures, developments in space sciences, space processing and manufactu…
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First Flight-Testing of LoRa Modulation in Satellite Radio Communications in Low-Earth Orbit Open
At present, the use of LoRa modulation in satellite radio communications and the construction of a CubeSat constellation for the satellite Internet of Things based on LoRa technology has already begun. However, the limits of applicability …
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CubeSat-Based Passive Bistatic Radar for Space Situational Awareness: A Feasibility Study Open
This paper proposes a low budget solution to detect and possibly track space debris and satellites in Low Earth Orbit. The concept consists of a space-borne radar installed on a cubeSat flying at low altitude and detecting the occultations…
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Simplified SEE Sensitivity Screening for COTS Components in Space Open
We introduce an approach aimed at prescreening COTS components according to their single-event effect (SEE) sensitivity for space missions in which a complete characterization of their individual response to protons and heavy ions is not f…
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The Interaction between the LEO Satellite Constellation and the Space Debris Environment Open
The wide application of satellite constellations in the field of space-based global communications and remote sensing has led to a substantial increase in small-satellite launch plans, a sharp increase in the density of space objects in lo…
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Development of an active magnetic attitude determination and control system for picosatellites on highly inclined circular low earth orbits Open
Small satellites are becoming increasingly important to the aerospace industry mainly due to their significantly reduced development and launch cost as well as shorter development time frames. In order to meet the requirements imposed by c…
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Toward Rollable Printed Perovskite Solar Cells for Deployment in Low-Earth Orbit Space Applications Open
The thin physical profile of perovskite-based solar cells (PSCs) fabricated on flexible substrates provides the prospect of a disruptive increase in specific power (power-to-mass ratio), an important figure-of-merit for solar cells to be u…
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Analysis of ballistic aspects in the combined method for removing space objects from the nearEarth orbits Open
We have considered one of the ways to clean the near-Earth orbits from space debris implying the removal of large-size objects, which represent a danger to space navigation and ecology of near-earth space, in the dense atmosphere of the Ea…
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Location-Based Handover Triggering for Low-Earth Orbit Satellite Networks Open
Broadband low Earth orbit (LEO) satellite constellations are a reality. The integration of satellite and terrestrial systems for mobile communications is taking-off with the development of non-terrestrial networks (NTN) and the ongoing dep…
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Realistic sunshade system at L1 for global temperature control Open
So far, space-based geoengineering has rarely been studied from a practical point of view, considered unrealistic as a near-future alternative to fight climate change. This paper evaluates the feasibility of implementing a space sunshade i…
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Technical Report: Space debris Open
At present, there are approximately 8,300 satellites actively orbiting the Earth, gathering and distributing vital data for space science, Earth observation, meteorology, disaster early warning systems, telecommunication, and navigation. S…
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Development of the aeromagnetic space debris deorbiting system Open
The study has considered the possibility of creating an aeromagnetic system for removing space debris from low Earth orbits. The peculiarity of the design of the aeromagnetic deorbiting system is the use of magnetic controls for the relati…
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Proposed Orbital Products for Positioning Using Mega-Constellation LEO Satellites Open
With thousands of low Earth orbit (LEO) satellites to be launched in the near future, LEO mega-constellations are supposed to significantly change the positioning and navigation service for ground users. The goal of this contribution is to…
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Tipping Points of Space Debris in Low Earth Orbit Open
Global services like navigation, communication, and Earth observation have increased dramatically in the 21st century due to advances in outer space industries. But as orbits become increasingly crowded with both satellites and inevitable …
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Design optimisation of low earth orbit constellation based on BeiDou Satellite Navigation System precise point positioning Open
The use of low earth orbit (LEO) satellites to enhance the performance of global navigation satellite system navigation and positioning services has become a popular research topic. In this study, NSGA‐III optimisation algorithm was used t…
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Toward the Use of Electronic Commercial Off-the-Shelf Devices in Space: Assessment of the True Radiation Environment in Low Earth Orbit (LEO) Open
Low Earth orbit missions have become crucial for a variety of applications, from scientific research to commercial purposes. Exposure to ionizing radiation in Low Earth Orbit (LEO) poses a significant risk to both spacecraft and astronauts…
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Development of the combined method to de-orbit space objects using an electric rocket propulsion system Open
A method has been developed for the combined de-orbiting of large-size objects of space debris from low-Earth orbits using an electro-rocket propulsion system as an active de-orbiting means.\n\nA principal de-orbiting technique has been de…
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Toward Accurate Physics‐Based Specifications of Neutral Density Using GNSS‐Enabled Small Satellites Open
Satellite‐atmosphere interactions cause large uncertainties in low‐Earth orbit determination and prediction. Thus, knowledge of and the ability to predict the space environment, most notably thermospheric mass density, are essential for op…
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Investigating Miniaturized Electrodynamic Tethers for Picosatellites and Femtosatellites Open
Peer Reviewed
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Detailed Thermal Design and Control of an Observation Satellite in Low Earth Orbit Open
The thermal environment in space has challenging conditions in which include vacuum, low pressure, atomic oxygen, extremely hot and cold. Satellites consist of electronic equipments and these equipments should be maintained at a certain te…
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Sun-synchronous repeat ground tracks and other useful orbits for future space missions Open
The development of oceanography and meteorology has greatly benefited from satellite-based data of Earth’s atmosphere and ocean. Traditional Earth observation missions have utilised Sun-synchronous orbits with repeat ground tracks due to t…
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An estimate of expected economic losses from satellite collisions with orbital debris Open
We estimate the expected annual cost of satellite collisions with orbital debris and find that the expected annual loss for all orbits was $86-103 million in 2020. Nearly all expected losses, $79-102 million, were in LEO, and these losses …
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A method for the experimental characterisation of novel drag-reducing materials for very low Earth orbits using the Satellite for Orbital Aerodynamics Research (SOAR) mission Open
The Satellite for Orbital Aerodynamics Research (SOAR) is a 3U CubeSat mission that aims to investigate the gas–surface interactions (GSIs) of different materials in the very low Earth orbit environment (VLEO), i.e. below 450 km. Improving…