Wednesday, September 2, 2009

Satellite Internet

These local networks will not be just the global cyberspace content dumping grounds like today’s Internet. Their applications and services will offer day-to-day applications that will really affect the way we work and live. In fact, they may even save our lives. We no longer can deny the importance of these critical network infrastructures. We must promote the understanding of every application that can be gained or sadly lost if we do not immediately deploy these networks.

Inclined orbit satellites are end of life satellites that may have an additional useful life span from 6 month to a few years, however they are no longer in their prescribed controlled orbit due to lack of fuel. From the point of view of a satellite owner, the economics of this situation are compelling. On one hand, the revenue derived from leasing transponder time on an satellite internet providers is considerably less than the revenue which could be realized from a truly geostationary satellite. On the other hand, propellent usage is cut dramatically, thereby extending the useful life of the satellite, often by several years. The potential revenue to be derived from this extended life more than offsets the revenue lost through reduced transponder pricing. It comes as no surprise, then, that many satellite owners have allowed their geostationary satellites to drift into inclined orbits.

An inclined-orbit satellite poses a problem for the end user: the earth station antenna must track the satellite. For this purpose, the antenna must be equipped with a dual-axis steerable mount and a tracking controller. A dual-axis steerable mount is a motorized mount which can be moved independently about two axes: east-west and up-down. Those moves are program-controlled. This type of controller mathematically calculates the pointing angles to the satellite and moves the antenna accordingly.

sunshine smile