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CanSat
A CanSat is a type of sounding rocket payload used to teach space technology. It is similar to the technology used in miniaturized satellites. No CanSat has ever left the atmosphere, nor orbited the earth.
In CanSat competitions, the payload is required to fit inside the volume of a typical soda can (66mm diameter and 115mm height) and have a mass below 350g.〔(【引用サイトリンク】url=http://www.cansat.eu/eu12-guidelines/eu12-requirements.html )〕 Antennas can be mounted externally, but the diameter can't increase until the CanSat has left the launch vehicle. The CanSats are deployed from small rocket at height which varies depending on the competition.〔(Mission: Planetary Atmospheric Entry Vehicle )〕 CanSats are equipped with a recovery system, usually a parachute, to limit damage upon recovery and to allow the CanSat to be reused. CanSats are used to teach space technology, because of their inexpensive price and small volume.
==History==
In 1998, about 50 students and faculties from 12 universities from the United States and Japan met at a symposium held in Hawaii. It was the first "University Space Systems Symposium". Here, Bob Twiggs, professor emeritus at the Stanford University, proposed the initial idea of what later would become the nanosatellite projects.〔Robert J. Twiggs, (/ cansatws / programandabstract.pdf "Introducing New Challenges for Future Space Missions" ), International CanSat Workshop, February 23, 2007〕 That idea was to launch a structure of the size of a soda can into space. Its volume should be around 350 milliliters and the mass, about 500 grams. This led to a project that began in 1999 called ARLISS, involving mostly American and Japanese Universities, carrying out the first launch on September, 11th of that year and continuing each year without interruption.The initial idea, still prevalent today, was to launch 3 satellites of 350 milliliters, or a satellite of greater volume. The means would be a rocket capable of moving 1.8 kilos and of ascending to 4000 meters, opening the door to low cost space flights -about $400.〔R. Walker et al., ("ESA Hands-on Space Education Project Activities for University Students: Attracting and Training the Next Generation of Engineers Space " ), 14–16 April 2010.〕
In 2000, the missions were very different: for instance, calculating the opening of a landing system using data provided by the barometer or making use of a differential GPS system. The project came to a more complex situation in 2001 when the ComeBack category was added, according to which the satellite should be directed to a particular target. This mission was very successful and, in 2002, students of Space Robotics Lab of the Tohoku University went up to 45 meters from the target and, in 2006, this figure dropped to 6 meters.Interest in this type of satellite has been growing and spreading. In 2003, the University of Tokyo placed into orbit two satellites CubeSat, satellites of a size slightly larger than the CanSats, and cube shaped. In recent years, several competitions have been developed following the same concept proposed by Prof. Bob Twiggs and reflected in ARLISS both national and internationally.
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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