Analysis of Field of View for a Moon-Based Earth Observation Multispectral Camera

Area of Science:

• Earth Science
• Astronomy
• Optical Engineering

Background:

• Moon-based Earth observation offers a unique vantage point for studying global phenomena.
• Unlike Earth-orbiting sensors, lunar-based systems face distinct challenges related to Earth's apparent size and motion.

Purpose of the Study:

• To analyze the critical factors influencing the field of view (FOV) design for a Moon-based Earth observation multispectral camera.
• To provide insights for optimizing FOV parameters, balancing observational needs with sensor limitations.

Main Methods:

• Analysis of Earth's apparent diameter and phase angle from the lunar surface.
• Modeling of Earth's and solar trajectories in the lunar sky.
• Incorporation of turntable pointing accuracy and temporal adjustment intervals into FOV calculations.

Main Results:

• The Earth's maximum apparent diameter from the Moon encompasses its full phase, necessitating an FOV larger than this maximum.
• Solar intrusion is unavoidable for lunar sensors, but excessively large FOVs are not required due to Earth's trajectory patterns.
• Optimal FOV design requires a comprehensive consideration of pointing accuracy and adjustment intervals.

Conclusions:

• Future Moon-based Earth observation camera designs must account for Earth's apparent size, phase, and trajectory.
• Balancing sensor pointing capabilities with observational requirements is crucial for effective lunar Earth observation.