A Power Budget Model for Highly Adaptive Small Satellites
Sunday C. Ekpo and Danielle George
Affiliation: Microwave & Communications Systems Research Group, School of Electrical & Electronic Engineering, The University of Manchester, Manchester, M60 1QD, UK.
Keywords: Dynamic power, highly adaptive small satellite, power budget, power contingency, space mission.Dynamic power, highly adaptive small satellite, power budget, power contingency, space mission.Dynamic power, highly adaptive small satellite, power budget, power contingency, space mission.
Small satellite power is a critical space segment resource that is at a premium. This is especially obvious when
considering highly adaptive small satellites (HASSs) that exhibit static and active (dynamic) power regimes.
Reconfigurable spacecraft modules and subsystems have been patented spanning core bus, payload, propulsion and
deployment interface. The majority depends on static power margins for specific mission requirements. This paper reports
a system-level power budget (PB) model for the HASS system. It beacons on the power-to-mass ratio, payload power
requirement, adaptive device technology used, power contingency factor and core bus subsystem power consumption.
Spacecraft power estimating relationships (PERs) that satisfy the next-generation small satellite system engineering
requirements have been developed based on past missions. A case study of a meteorological mission in low earth orbit is
presented. Furthermore, field programmable gate array power regimes measurements were done to assess the power
requirements of the active device. 90 mW of differential dynamic power was observed to represent 2.8 % of a 5-kg highly
adaptive small nanosatellite power margins in low earth orbit (LEO). The presented results reveal that the HASS power
margin must be at least equal to the designed maximum baseline power margin. A space mission can be stalled if the inorbit
dynamic power increases beyond the designed maximum allowable power margin. The proposed HASS PB model
enhances the design of reliable and high performance solar panels at first sight for deterministic space operations.
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