Horizon Estimation Model for Extended Source Targets

The is used to estimate the line of sight of the thermal imaging system. The basic idea is that the actual temperature difference between the target and the background with a spatial frequency is transmitted through the atmosphere, and is still larger than the when it reaches the thermal imaging system; The angle should be greater than or equal to the minimum opening angle required for the level of observation. The traditional expression for line-of-sight estimation is

Where is the characteristic spatial frequency of the target; is the target-to-system distance; is the temperature difference between the target and the background when reaching the thermal imaging system, which is a function of the distance and the spatial frequency ; Ne is required by the Johnson criteria The number of target equivalent strips; is the target height; is the angle formed by the target to the system.

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