This paper explores trade-space of mode-changes of a dual-mode satellite constellation and the refuelingoperation of on-orbit supply depots that support the constellation. The dual-mode disaster constellation operates intwo different modes – the normal mode and disaster mode. In the normal mode, the constellation performs globalweather monitoring in low Earth orbit (LEO). When a disaster breaks out, i.e. in the disaster mode, the constellationis reconfigured; satellites transfer to very low Earth Orbit (VLEO) to provide a better view in the vicinity ofdisasters. After the disaster is resolved, the satellites in VLEO return to their original orbits to resume the normalmode. The extra amount of propellant consumed from this high-mobility maneuver is provided by the on-orbitsupply depot. Trade-offs among the propellant consumption (to minimize), the response time (to minimize), and theaccess area in normal mode (to maximize) are considered to explore the transfer types for the mode-change and thealtitude of the normal mode. Options for the number of on-orbit supply depots and the drift rate for refuelingoperation can be also explored considering the time to complete the preparation and associated probability to getready for the next disaster break-out.
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