Camera Power Model

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Description

The Camera Power Model extends the Sensor Power Model to add capture-specific power behavior for a Camera payload. It inherits constant-power load (CPL) quasi-static behavior from the sensor model and adds a one-tick power spike when the camera captures an image. The model also gates the camera’s ability to capture based on voltage availability.

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Example Use Cases

• Camera Power Simulation: Model realistic power draw during imaging operations, including transient spikes during image capture.
• Power Budget Analysis: Evaluate the impact of camera operations on spacecraft power budgets.

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Module Implementation

Power Consumption

The model inherits state-based power consumption from the Sensor Power Model (Operational, Standby, Shutdown states). When a capture is triggered, additional power is drawn for one simulation tick:

$$P_{\text{total}}=P_{\text{state}}+P_{\text{capture}}$$

where $P_{\text{state}}$ is the base power for the current sensor state and $P_{\text{capture}}$ is the capture power spike (default 2 W). The spike is cleared at the end of each frame.

Capture Gating

The model controls the camera’s ability to capture images based on power availability. Capture is only permitted when both conditions are met:

1. The sensor is in the Operational state
2. The solved voltage meets the minimum threshold:

$$|V_{\text{node}}|\ge V_n\times r_V$$

where $V_n$ is the nominal operational voltage and $r_V$ is the minimum voltage ratio.

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Assumptions/Limitations

• The capture power spike lasts exactly one simulation tick regardless of actual exposure duration.
• Capture gating is based on instantaneous voltage; brief brownouts will prevent capture even if power recovers within the same tick.