SPACETRC / RESEARCH LABORATORY 5.0
Think in connected systems.
Compare power, battery, data and temperature budgets under the same assumptions. Measure how one choice affects the other systems.
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Set mission assumptions
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Four connected budgets
Power and energy
Mean load P = base + payload × duty + transmitter × contact/orbit duration. Generated energy is sunlight electrical power × sunlit time × efficiency; consumption is P × orbit duration. Minutes are converted to hours.
E_net = P_solar η (T − T_eclipse)/60 − P_mean T/60Eclipse and battery
Base and duty-weighted science loads continue in eclipse; this conservative case permits the entire contact interval to overlap eclipse. Required battery energy is compared with discharge efficiency and usable capacity. Cell ageing, current and temperature limits are not modelled.
Data balance
Data is produced only while the science payload is active. Downlink rate × contact time is compared with produced data. This is a transfer budget; RF link quality, antenna pointing, coding losses and ground-station availability are not calculated.
Thermal balance and assumption interval
One-node steady grey-body model: T = [(P_mean + Q_external)/(εσA) + 3⁴]¼. σ = 5.670374419 × 10⁻⁸ W m⁻² K⁻⁴. Thermal inertia, conduction and changing attitude are omitted. The ± interval compares independent power extremes; it is not a statistical confidence interval.
These scenarios are not SpaceTRC flight hardware or qualified vehicle designs. They teach the effect of assumptions on budgets; they do not perform real mission qualification.