Showing papers in "Advances in Space Research in 2011"

TL;DR: A lake data center is under development at LEGOS (Laboratoire d'Etude en Geophysique et Oceanographie Spatiale) in Toulouse, in coordination with the HYDROLARE project as discussed by the authors.

TL;DR: The development, operation, and analysis of data from cubesats can promote science education and spur technology utilization in emerging and developing nations as mentioned in this paper, which has led more than 80 universities and several emerging nations to develop programs in this field.

TL;DR: A new sensitivity study on using ADR to stabilize the future LEO debris environment is described, using the NASA long-term orbital debris evolutionary model, LEGEND, to quantify the effects of several key parameters, including target selection criteria/constraints and the starting epoch of ADR implementation.

TL;DR: The PPP-RTK model currently cannot satisfy the critical requirement of instantaneous precise positioning where ambiguity-fixed solutions have to be achieved within at most a few seconds, however, this model can still be potentially applied to some near-real-time remote sensing applications, such as the GPS meteorology.

TL;DR: In this paper, the authors present the current status and new developments of remote sensing using Global Navigation Satellite System (GNSS) signals as well as its future directions and applications, including monitoring sea ice, dangerous sea states, ocean eddy and storm surges.

TL;DR: In this article, the authors discuss the underlying theory of three-dimensional magnetic reconnection and review a selection of new models that illustrate the current state of the art, as well as highlighting the complexity of energy release processes mediated by reconnection in complicated 3D magnetic fields.

TL;DR: A GNSS water vapour tomography system developed to reconstruct spatially resolved humidity fields in the troposphere is described and it was found that the multiplicative techniques (MART) provide the best results with least processing time.

TL;DR: In this article, the application of HyMap airborne hyperspectral data and ASTER satellite multispectral images to mineral exploration and lithologic mapping in the Arctic regions of central East Greenland is discussed.

TL;DR: In this paper, the authors presented some theoretical simulations of the specular scattering coefficient of a forested area, with the aim of demonstrating the potentiality of GNSS-R in monitoring forest biomass.

TL;DR: A systems level overview of the CubeSat mission is presented, focusing on the mission orbit and de-orbiting, in addition to the deployment, attitude control and the satellite bus.

TL;DR: In this article, a high-time resolution Neutron Monitor Database (NMDB) has started to be realized in the frame of the Seventh Framework Programme of the European Commission.

TL;DR: In this article, it is shown that it is not feasible to assess the risk from extreme events using simple statistical methods, and instead we must exploit our knowledge of solar-terrestrial physics to find other ways to assess these risks.

TL;DR: In the early 2000s, NASA made substantial progress in the development of solar sail propulsion systems for use in robotic science and exploration of the solar system as mentioned in this paper, and two different 20-m solar sail systems were produced.

TL;DR: In this article, a solar sail application-pull technology development roadmap is established, using each mission as a technology stepping-stone to the next, and a new vision for solar sailing is presented which increases the technology readiness level and reduces the advancement degree of difficulty of solar sailing.

TL;DR: A method that contributes to achieving a requisite increase in orbit prediction accuracy for objects in the publicly available two-line element (TLE) catalog is described, leading to a predicted range error that increases at a typical rate of 100 m per day.

TL;DR: A new attitude control system for a solar sail, which leverages solar radiation pressure, which achieves completely fuel-free and oscillation-free attitude control of a flexible spinning solar sail and is successfully verified in comparison with the ground-based analytical performance estimation.

TL;DR: In this paper, the authors provide GNSS-based measurements of the tropospheric water vapour content with a temporal resolution of 1 h and a temporal delay of less than 1 h to assimilate these estimates into the INCA system.

TL;DR: The results of the GNSS+ Project as well as the improvements proposed in the frame of the ADVISE Project are described, which have been possible to low very visibly the payload maximum RF power, and to keep the orbit and clock estimation accuracy, which was already on the few cm level.

TL;DR: A universal space robotic servicing system that can serve most existing satellites in GEO, not requiring specially designed objects for grappling and measuring on the target, and developed key pose (position and orientation) measurement and control algorithm.

TL;DR: In this paper, the status of UVOIR observations of isolated neutron stars, their emission properties, and the results from recent observations are described. But the results of these observations are limited.

TL;DR: The derived yaw-attitude model proves to be much better than the nominal yAW-attitudes model commonly being used by today’s GLONASS-capable GNSS software packages as it reduces the observation residuals of eclipsing satellites down to the normal level of non-eclipsing satellites and thereby prevents a multitude of measurements from being incorrectly identified as outliers.

TL;DR: In this paper, the authors investigated the feasibility of using a medium-powered (5kW) ground-powered laser combined with a ground-based telescope to prevent collisions between debris objects in low-Earth orbit (LEO) using photon pressure alone as a means to perturb the orbit of a debris object.

TL;DR: In this article, the simulation results for reproduction of the observed seismo-ionospheric great positive effects in TEC prior to strong Wenchuan earthquake are presented, and the obtained results confirm the proposed mechanism of seismo ionospheric effects formation by the penetration of the seismogenic electric field from the atmosphere into the ionosphere.

TL;DR: In this article, the authors present an automated system for detecting, tracking, and cataloging emerging active regions throughout their evolution and decay using SOHO Michelson Doppler Interferometer (MDI) magnetograms.

TL;DR: Methods and algorithms for the solution of the spatiotemporal radio tomography of ionospheric electron density based on the data from high orbiting global navigational satellite system (GNSS) are developed and the resolution of the proposed technique is estimated.

TL;DR: In-Situ Resource Utilization (ISRU) has the potential to significantly reduce the launch mass, risk, and cost of robotic and human exploration of space.

TL;DR: This study combines GPS and GLONASS observations in geodetic TFT in order to determine the added value of theGLONASS data in the results, and demonstrates that using both constellations improves the solution for both CV and PPP results when analysing short data batches.

TL;DR: In this paper, the authors used hyperspectral reflectance to detect nutrient stress in Lactuca sativa L. cv. Lettuce seedlings were grown for 90 days in a greenhouse or growth chamber in vermiculite containing modified Hoagland's nutrient solution with key macronutrient elements removed in order to induce a range of nutrient stresses, including nitrogen, phosphorus, potassium, calcium and magnesium.

TL;DR: In this paper, the propagation of a strong cylindrical shock wave in an ideal gas with azimuthal magnetic field, and with or without axisymmetric rotational effects, is investigated.

TL;DR: In this paper, a modified GNSS tomography model was tested for real GNSS observations delivered from the GNSS network Karkonosze located in the Sudety mountains and compared with the COAMPS model.