GPS is increasing being used for a wide range of applications.Its use for spacecraft navigation has been already demonstrated for absolute real-time positioning and precise orbit determination.Now,in preparation for the proximity navigation of the ESA Automated Transfer Vehicle (ATV) around the International Space Station,spacecraft relative navigation using GPS has to be demonstrated.For this and within the ATV Rendezvous Pre-development (ARP) project,a number of Flight Demonstrations using the NASA STS and another spacecraft are going to be carrid out.The spacecraft will carry GPS receivers and the data collected will be used to validate the algorithms that are being proposed for ATV relative navigation.
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