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Showing papers in "Advances in Space Research in 2015"


Journal ArticleDOI
TL;DR: There is a growing appreciation that the environmental conditions that we call space weather impact the technological infrastructure that powers the coupled economies around the world as discussed by the authors, and there is also a growing awareness that space weather impacts the technologies that are used in the world.

255 citations


Journal ArticleDOI
TL;DR: A review of vertical coupling in the atmosphere and ionosphere system induced by internal waves of lower atmospheric origin is presented in this article, focusing on gravity waves, solar tides, planetary Rossby and Kelvin waves.

214 citations



Journal ArticleDOI
TL;DR: The mass density of Earth's thermosphere (∼90-600 km altitude) is a critical parameter for low Earth orbit prediction because of the atmospheric drag on satellites in this region.

185 citations


Journal ArticleDOI
TL;DR: To facilitate the joint analysis of GNSS observations and satellite laser ranging measurements, laser retroreflector array coordinates consistent with the IGS-specific spacecraft frame conventions are provided in addition to representative antenna offset values for all GNSS constellations.

176 citations


Journal ArticleDOI
TL;DR: The results indicate that the system time differences of GPS with BeiDou, GLONASS and Galileo are very stable over time with STD values of better than 1.1 ns.

155 citations


Journal ArticleDOI
TL;DR: This article analyzes the orbit and clock quality of the Galileo products of four MGEX analysis centers for a common time period of 20 weeks and finds that orbit comparisons of the individual analysis centers have a consistency at the 5–30 cm level.

129 citations


Journal ArticleDOI
TL;DR: First PSO results from more than one year of Swarm GPS data indicate that the consistency between the reduced-dynamic and kinematic Swarm PSO for most parts of the Earth is at the 4–5 cm level.

122 citations


Journal ArticleDOI
TL;DR: In this article, a forced Korteweg de Vries (fKdV) type model equation was proposed for the excitation of advancing solitary waves (precursor solitons) in the upstream region of the moving object apart from weak dispersive excitations in the down stream region.

96 citations


Journal ArticleDOI
TL;DR: In this article, the long-term stability of the 10-year Jason-1 and Envisat GDR-D orbit time series is provided for two time scales: interannual and decadal.

84 citations


Journal ArticleDOI
TL;DR: Lunamer as discussed by the authors is a construction material that consists of up to 98% lunar regolith, drastically reducing the amount of material that must be carried from Earth in the event of lunar construction.

Journal ArticleDOI
TL;DR: In this paper, the authors investigated the mutual influence of the tether vibrations and the vibrations of flexible appendages during the thrusting phase of tethered deorbit of large, non-functional spacecraft.

Journal ArticleDOI
TL;DR: In this paper, the authors presented a global median model of the ionospheric F2-layer peak height (hmF2), which is based on the radio-occultation data of the satellite missions CHAMP (2001-2008), GRACE (2007-2011), COSMIC (2006-2012) as well as the ionosphere sounding data from the 62 Earth-based Digisonde sounders (1987-2012).

Journal ArticleDOI
TL;DR: In this paper, two variables of joint angle and elastic deformation are partly decoupled by a nonlinear decoupling feedback control method and an extended state observer is introduced to estimate nonlinear terms of the two-link flexible manipulator system.

Journal ArticleDOI
TL;DR: The innovation activities performed in the field of space education since the academic year 2009/10 at the Technical University of Madrid, in collaboration with the Spanish User Support and Operations Center (E-USOC), the center assigned by the European Space Agency (ESA) in Spain to support the operations of scientific experiments on board the International Space Station.

Journal ArticleDOI
TL;DR: In this paper, the authors compare the performance of the Synthetic Aperture Radar (SAR) and Pseudo-LRM (PLRM) data with in situ and model data to derive precision and accuracy at 1 Hz in open ocean, at distances larger than 10 km from the coast.

Journal ArticleDOI
TL;DR: In this paper, the impact of a harpoon on a 3-mm Al-H/C plate with conical-shaped steel tips was investigated, and it was shown that the ballistic limit increases with obliquity at a greater rate for blunt tips than conical ones.

Journal ArticleDOI
TL;DR: In this paper, the authors investigated variation of the ionospheric total electron content (TEC) in the low latitude Indian sub-continental region from the GPS observations and its comparison with the global ionosphere maps (GIMs), standard international reference ionosphere (IRI 2012), and the standard plasmasphere-ionosphere model (SPIM) for the period from November 2011 to October 2012 that corresponds to the progressive phase towards the midst of the solar cycle-24.

Journal ArticleDOI
TL;DR: In this paper, a short-delay, near-grazing incidence multipath from the L5-band GPS SNR is assessed for its value in detecting soil moisture and snow depth.

Journal ArticleDOI
TL;DR: In this article, the authors focused on performance analysis and accuracy enhancement of long-term position time series of a regional network of GPS stations with two near sub-blocks, one block of 8 stations in Cascadia region and another block of 14 stations in Southern California.

Journal ArticleDOI
TL;DR: A simplified and unified model for multi-GNSS PPP is developed, where ISB parameter does not need to be estimated and observations from different GNSS systems are treated in a unified way.

Journal ArticleDOI
TL;DR: In this paper, the primary peak retracker was used to determine the sea surface height in the Arctic using the Cryosat-2 Level-2 SAR data, which is the first time SAR data were processed using such retrackers.

Journal ArticleDOI
TL;DR: The International Reference Ionosphere (IRI) model has been updated with the IRI-2012 version as mentioned in this paper, which includes new models for the electron density and ion densities in the region below the F-peak, a storm-time model for the auroral E-region, an improved electron temperature model that includes variations with solar activity, and for the first time a description of auroral boundaries.

Journal ArticleDOI
TL;DR: In this article, the authors compared IRI-2012 and IRI Plas models with diurnal GPS vTEC data derived from European mid-latitude GPS station Potsdam and found that all models do not represent correctly the topside profile part and tend to overestimate the electron density higher than F2 peak.

Journal ArticleDOI
TL;DR: In this article, a simple physical mechanism was proposed for the formation of the Low Ionization Line part of the Broad Line Region in Active Galactic Nuclei, where the local effective temperature of a non-illuminated accretion disk drops below 1000 K and allows for dust formation.

Journal ArticleDOI
TL;DR: An innovative method based on spectral decomposition for solving a special type of linear system with variable coefficients, where the system matrix can be expressed as the product of a scale function and a constant matrix is proposed.

Journal ArticleDOI
TL;DR: In this paper, the contribution of the global plasmaspheric and ionospheric electron content (PEC and IEC) into total electron content was estimated by comparison of GPS TEC observations and FORMOSAT-3/COSMIC radio occultation IEC measurements.

Journal ArticleDOI
TL;DR: In this paper, different lunar and Martian dust transport mechanisms are presented, followed by a review of previously developed dust mitigation technologies including fluidal, mechanical, electrical and passive self-cleaning methods for lunar/Martian installed surfaces along with filtration for dust control inside cabins.

Journal ArticleDOI
TL;DR: In this paper, the Criticality of Spacecraft Index (CSI) was proposed to rank the environmental criticality of abandoned objects in Low Earth Orbit (LEO), taking into account the physical characteristics of a given object, its orbit and the environment where this is located.

Journal ArticleDOI
TL;DR: In this article, the cumulative luminosity distributions of a number of supergiant fast X-ray transients (SFXTs) and classical SgXBs were investigated with a high-sensitivity focusing Xray telescope.