4 Final Report - Emits - ESA

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3 Final Report cloud scenes where the cloud coverage, although the spots might feature high cloud amount. The only restrictions for observations on Geo-Oculus, are areas clouded the whole day with no cloud movement. Conclusion Geo-Oculus has been found to provide the best possible ground coverage at high resolution with a significant improvement compared to LEO-missions. The achievable ground coverage with Geo- Oculus at ~40 m GSD over Europe is ~2.5 times more than Sentinel 3 at 300 m GSD. This advantage results from the swath width, the orbit geometry of LEO-missions which results in three swaths per day over Europe at fixed local times and on the other side the capability of Geo-Oculus to access whole Europe and to pick the cloud free points in time. The unique feature of multiple acquisitions and near real time mission plan updating is bund to geo-synchronous missions and can not be provided by LEO-missions. Page 3-26 Doc. No: GOC-ASG-RP-002 Issue: 2 Astrium GmbH Date: 13.05.2009
4 Final Report 4 Mission and System Level Analyses 4.1 Mission Architecture A visualisation of all elements contributing to the Geo-Oculus mission architecture is shown in Figure 4.1-1. Figure 4.1-1: Mission Architecture 4.2 Mission Analysis Mission analyses issues have already been traded in [RD 7] for the following topics: • type of orbit, • orbit inclination, • orbit determination performance, • orbit transfer and launcher. The preferred mission parameters which were assumed for the subsequent analyses of technical solutions for the spacecraft are summarised hereafter. Type and inclination of orbit A geostationary orbit with 0 degree inclination is the suggested baseline. It requires only one spacecraft and provides constant observation conditions (view Zenith angle) but it is linked to about 300 kg of fuel consumption to be assigned for North South station keeping. Doc. No: GOC-ASG-RP-002 Page 4-27 Issue: 2 Date: 13.05.2009 Astrium GmbH
Page 1: Geo-Oculus: A Mission for Real-Time
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4 Final Report - Emits - ESA

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