STRATELLITES

R.SRICHARAN 3RD B.TECH ECE SITAMS R.VENKATA AVINASH 3RD B.TECH ECE SITAMS Contents            Evolution 4G Communication Introduction Stratellite Construction Working Pros and Cons Services Applications Conclusion References TDMA  3G .EVOLUTION Generations of wireless communications:  1G .CDMA  4G .OFDM .FDMA  2G . Why 4G?    High speed High capacity with low bit cost High capacity with reasonable frequency bandwidth . 4G and its Systems Some of the systems for future mobile communications are:  Broad-Band Wireless Systems  Intelligent Transport Systems  High Altitude Stratospheric Platform Station Systems (HAPS) . HAPS    Optical intercommunication links Broadband access link Operated at an altitude between 3-22Km . INTRODUCTION  A “Stratellite” is a high altitude airship (HAA) which are unmanned Kevlar balloons filled with helium . 000 square mile area .00.STRATELLITE     HAA 25 times larger than “Good year blimp” Placed in stratosphere 13 miles above the earth Placed significantly lower than earth’s lower orbit Can service a 3. First Stratellite . CONSTRUCTION    Outer layer is made of spectra Spectra is a fabric used in bullet proof vests Inside layer is made of Mylar Mylar is a thin but strong polyester film Filled with a mixture of helium and air . CONSTRUCTION         Propeller Solar cells Regenerative fuel cells Helium gas bag Catenary curtain X-shaped tail assembly Hybrid electric motors Transponder . Working    The helium gas expands pushing air out and lifting airship Uses solar cells sprayed on their surface to generate electricity The generated electricity drives propellers that work with GPS technology to keep the stratellite stationary . 000 square-miles Two-way high speed data communication High speed broad-band access even in remote area .PROS      Signal latency Low expensive launches Service an area of 300. CONS • • may lead to traffic problems in stratosphere would require efficient ground control and maintenance . SERVICES   By linking several stratellites we can provide wireless broadband network for thousands of miles We can be connected to internet immediately after reopening the laptop . APPLICATIONS   The Stratellite can provide efficient solutions in the field of fighting ecological disasters The Stratellite can be used as a floating mobile telecommunication station for all telecommunication . if successful. would be revolutionary for underserved areas and also play a vital role in future generation wireless communication When all satellite communications are blocked due to superheating of the stratosphere.CONCLUSION • • • • Provide the require facilities of wireless communication more efficiently than the ordinary towers Minimizes the cost of communication The idea of stratellite. Stratellites can maintain their own global communications . com    http://pesn.com http://www.sanswire.yenra.References  http://en.wikipedia.com .org/wiki/Stratellite http://www. Querie .