SPATIAL GEOMETRY DESIGN OF A LOW EARTH ORBIT CONSTELLATION FOR IRANIAN REGIONAL NAVIGATION SATELLITE SYSTEM

The regional navigation satellite system (RNSS) is recently used in some countries to cover or enhance their local navigation.The most important satellite navigation systems to date are in the Earth medium orbit (MEO) and Earth synchronous Earth orbit (GEO), which are characterized by big satellites, and high launch, construction, and operation cos

Acromyrmex fracticornis grass-cutting ants construct conspicuous chimney-shaped nest turrets made of intermeshed grass fragments.We asked whether turrets are constructed by merely piling up nearby materials around the entrance, or whether ants incorporate different materials as the turret develops.By removing the original nest turrets and following