“Beijing 1” is one Micro-satellite of the international Disaster Monitoring Constellation (DMC). It was launched successfully in 2005, and has high-powered characteristic, such as high gaining data ability, high storage ability, high space resolution, high time resolution and low cost. At present it is necessary to make objective appraisal for image quality and application potential in differen...

the use of satellite data in an estimation of air temperature (ta) near the earth’s surface has turned into an effective way for a large area of high spatial and temporal resolution. throughout the present study, artificial neural network (ann) as well as m5 model tree were employed to estimate ta in khuzestan province (south west of iran), using satellite remotely sensed land surface temperatu...

Since the beginning of 2012, the first Pleiades-HR satellite of the program conducted by the French National Space Agency, CNES, delivers 20 km wide color scenes with a 70 cm ground sampling distance. A second satellite should be launched in 2013 which will achieve an almost world-wide coverage with a revisit interval of 24h. The assessment of the image quality and the calibration operation hav...

urbanization and population growth along with an increase in the environmental pollution resulting from human activities which have dramatically changed the green space and land cover have been key factors in the sustainable development of land and the management of land use. to collect reliable data required for providing land cover maps as well as for investigating the environment, remote sen...

We analyse the projected radial distribution of satellites around bright primary galaxies in the 2dFGRS. We have considered several primary-satellite subsamples to search for dependences of the satellite number density profiles, ρ(rp), on properties of satellites and primaries. We find significant differences of the behaviour of ρ(rp) depending on primary characteristics. In star-forming primar...

Abstract A global quantum repeater network involving satellite-based links is likely to have advantages over fiber-based networks in terms of long-distance communication, since the photon losses vacuum scale only polynomially with distance – compared exponential optical fibers. To simulate performance such networks, we introduced a scheme large-scale event-based Monte Carlo simulation repeaters...

Microsatellites flying around big spacecraft can provide security monitoring for spacecrafts, extend mission functions, and provide an ideal platform for demonstrating and verifying key technologies of coordinated space missions. Most companion satellites have orbit manoeuvre capability. They usually take space station, aircraft, piloted spaceship, big satellite or other big spacecraft as task ...

We study the vertical heating and thickening of galaxy disks due to accretion of small satellites. Our simulations are restricted to axial symmetry, which largely eliminates numerical evolution of the target galaxy but requires the trajectory of the satellite to be along the symmetry axis of the target. We find that direct heating of disk stars by the satellite is not important because the sate...

Formation flying of clusters of micro-, nanoand pico-satellites has been recognized to be more affordable,robust and versatile than building a large monolithic satellite in implementing next generation space missions requiringlarge apertures or large sample collection areas and sophisticated earth imaging/monitoring. We propose a propellantfree, thus contamination free, method that ...