Research on optical simulation of dim target based on passive detection link analysis

Area of Science:

• Optical Engineering
• Astronomy
• Remote Sensing

Background:

• Ground calibration of optical detection equipment is crucial for identifying dim targets.
• Existing methods may lack the precision required for faint celestial object analysis.
• Accurate simulation is needed to assess optical system performance.

Purpose of the Study:

• To propose an optical simulation method for dim targets.
• To meet ground calibration requirements for optical detection equipment.
• To analyze optical characteristics of dim targets.

Main Methods:

• Developed a simulation method based on passive detection link analysis and bidirectional scattering distribution function (BSDF) models.
• Established an off-axis collimation system for long focal lengths.
• Designed an internal stray light suppression baffle to minimize secondary scattering.
• Built an integrated optical simulation system for dim targets.

Main Results:

• The system simulates apparent magnitudes from +7 to +20 Mv with accuracy better than 0.07 Mv.
• Tested camera detection ability using a simulated +15 Mv point source.
• Achieved a signal-to-noise ratio of 6.7 for star point targets, meeting detection and false alarm rate requirements.

Conclusions:

• The proposed method effectively simulates dim targets for ground calibration.
• The optical simulation system successfully validates camera detection capabilities for dim targets.
• This work enables ground testing of optical detection equipment for faint celestial objects.