4 Final Report - Emits - ESA

3 Final
Report
Effective Coverage
100 %
TBD%
TBD%
TBD%
Eff. cov. after 65 images
Optimised pattern
Eff. cov. LEO mission
non-optimised pattern
Number of
Emergency Missions
Theroetical maximum coverage
during one observation cycle
(cloudfree min. once per observation cycle)
65 130 195
10
Improvement of effective
coverage by Geo-Oculus
Number of marine
Images
Figure 3.3-1: Correlation between effective coverage for marine application mission and number of
emergency missions
For the system baseline, a mission scenario with 2.5 times coverage of the European coastlines
(= 165 marine images) has been chosen.
3.3.1 Mission Scenario Baseline
The key parameters for sizing the proposed mission scenario baseline are:
• Manoeuvre time (based on the proposed magnetic bearing reaction wheel baseline);
• Image acquisition time;
• Product FoV for marine applications;
• Number of images for marine applications.
The number of marine missions and parallel emergency missions have to be traded and balanced
against each other. The minimum requirements for Geo-Oculus are:
• Full coverage of European coastlines (about 65 images within 9 hours);
• At least one fire monitoring mission in parallel (10 min revisit time);
• At least one disaster and one oil slick mission in parallel (60 min revisit time).
The time, which is still left can be used for either increase the effective (cloudless) coverage for marine
applications or increase the number of emergency missions. The following table gives an overview on
the used baseline parameters:
Doc. No: GOC-ASG-RP-002 Page 3-19
Issue: 2
Date: 13.05.2009 Astrium GmbH
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