Collision probabilities between certain pairs of Earth-orbiting satellites are calculated, and it is shown that the major risk to objects in low-Earth orbit (such as the Space Shuttle) is due to the large number of smaller items of debris which encircle our planet. At higher altitudes, in th...
In order to overcome this difficulty, the nominal solution is provided together with FORTRAN programs which would allow the unknown parameters of the solution to be fitted to geological records. 展开 关键词: Earth Surface Orbit Perturbation Secular Variations Solar Orbits Solar System Elliptical Orbits...
We develop an integrated orbit determination of FY-3C, BDS, and GPS satellites The result shows that the integrated orbit determination can significantly improve the orbit of both FY-3C and navigation satellites The SLR validation results further confirm the benefit of integrated orbit determination Ab...
The Sentinel-2 mission consists of a constellation of two twin satellites flying in the same Sun-synchronous polar orbit but phased at 180∘180° at a mean altitude of 786 km, designed to give a high revisit frequency of five days at the Equator. It aims at monitoring the variability of...
Experience fast and easy access to Maxar’s 125+ petabyte, 20+ year image library of the world’s most advanced Earth Intelligence. Preview MGP Non-Earth imaging (NEI) Maxar’s constellation can image objects in low Earth orbit at less than 6-inch resolution and help track objects across a...
orbitunder perturbation are divided into three categories,termedscale enlargement,drift and distortion respectively.By prop-erly choosing the initial mean orbital elements for the leaderand follower satellites,the deviations from originally regu-lar formation orbit caused by the perturbation can be sup-...
A survey of studies into errors in large scale space-time averages of rainfall, cloud cover, sea surface processes and the earth\"s radiation budget as derived from low earth orbit satellite instruments because of their incomplete temporal and spatial cove ...
The idea of Very-Low-Earth-Orbit (VLEO) at an altitude of around 350 km has the potential to change the paradigm for the Internet because it is much lower than the traditional low Earth orbit (LEO) at 600 km to 1200 km and geostationary Earth orbit (GEO) at 35,768 km. Compared to...
2020) is to obtain precise global and high-resolution models for both the static and the time variable components of the Earth’s gravity field. It is a successor to the original GRACE mission (Tapley et al. 2004), which orbited Earth from March 2002 until October 2017. GRACE-FO was ...
When the observed orbit does not match the orbit computed from the known potential coefficients, more realistic potential coefficient values can be derived. In order to derive a complete set of more realistic potential coefficients, the procedure has to be formulated for a multitude of different ...