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Sputnik I |
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iPSTAR-1 |
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Cubesat |
Nanosats like the SMDC-ONE weigh less than 10 pounds and are about 4x4x13 inches in size. Developed by the U.S. Army Space and Missile Defense Command and the Army Forces Strategic Command, SMDC nanosats are inexpensive by satellite standards, costing about $1 million each, and expected to be much less as manufacturing processes are refined. The first SMDC nanosat went into orbit in 2009.
Engineers foresee nanosats functioning in swarms -- clouds of devices that will work together in varieties of configurations to accomplish ever-changing missions. Some swarms will answer to a larger mother satellite to communicate with each other and with ground controllers.
James Cutler, an assistant professor in the Department of Aerospace Engineering at the University of Michigan, is working with SRI International, one of the world's largest contract research institutes, to develop nanosatellites such as the Radio Aurora Explorer (RAX), a craft funded by the National Science Foundation to study space weather. RAX, a Cubesat device weighing 6.6 pounds, is scheduled for a launch in May 2010.
A team of engineering students working under Cutler is designing a deployable high-gain UHF antenna for nanosatellites. They’ll integrate the antenna into an eXtendable Solar Array System (XSAS) that’s currently in development. Typical nanosatellite antennas have low-gain (2-5dBi) as a consequence of size constraints. In order to use a nanosaatellite for tracking or remote data collection applications, such as tracking animal migration, pipeline sensor data collection and emergency beacon communication, the nanosat requires a higher gain antenna. The student team’s goal is to design an antenna with 11dBi gain that will be deployed with the XSAS system. They explain their project in the following video.
A team of engineering students working under Cutler is designing a deployable high-gain UHF antenna for nanosatellites. They’ll integrate the antenna into an eXtendable Solar Array System (XSAS) that’s currently in development. Typical nanosatellite antennas have low-gain (2-5dBi) as a consequence of size constraints. In order to use a nanosaatellite for tracking or remote data collection applications, such as tracking animal migration, pipeline sensor data collection and emergency beacon communication, the nanosat requires a higher gain antenna. The student team’s goal is to design an antenna with 11dBi gain that will be deployed with the XSAS system. They explain their project in the following video.
Nanosatellites will also be a tool to help keep space clean. Fifty years of abandoning spacecraft in orbit has left about 5,500 tons of debris cluttering space around the planet and posing a substantial threat to hugely expensive unmanned and manned spacecraft. If current practices prevail, engineers expect that number to grow at a rate of five percent a year. Although nanosats won't cut the amount of debris already whizzing overhead, they will help stop future missions from adding to the problem.