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Cornell University Satellite : ウィキペディア英語版 | Cornell University Satellite
The Cornell University Satellite (CUSat) is a nanosatellite developed by Cornell University that launched on 29 September 2013. It used a new algorithm called Carrier-phase Differential GPS (CDGPS) to calibrate global positioning systems to an accuracy of 3 millimeters. This technology can allow multiple spacecraft to travel in close proximity. The CUSat project began in 2005 and was the winner of the University Nanosat-4 Program which aims to educate the future aerospace workforce and develop new space technologies. As part of this program, CUSat completed environmental testing and other aspects of final I&T in the AFRL Aerospace Engineering Facility at Kirtland Air Force Base. CUSat worked with AFRL to complete the Department of Defense SERB process in preparation for a launch with the Space Test Program. The satellite launched as a secondary payload to CASSIOPE on a SpaceX Falcon 9 rocket on 29 September 2013. ==Operation details== The space segment was originally designed to consist of two functionally identical satellites that would launch together and separate on orbit in a target-inspector configuration. Once in orbit, CUSat would use microthrust Pulsed Plasma Thrusters (PPTs) and sub-centimeter level accurate carrier-phase differential GPS (CDGPS) to navigate the satellites to within ten meters of each other. The inspector satellite would use cameras to gather imagery of the target satellite while performing relative navigation. Target satellite imagery would be transferred to the ground segment where they would be used to reconstruct a three-dimensional model for the end user. The mission was modified after one of the segments was damaged during testing. It later consisted of a single satellite with multiple antennas that transmit data to each other.〔
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