Non-line-of-sight multiscatter propagation model

Area of Science:

• Atmospheric optics and radiative transfer
• Computational physics and modeling

Background:

• Understanding atmospheric radiation propagation is crucial for various applications.
• Existing models often simplify scattering effects, particularly multiscatter phenomena.
• Non-line-of-sight (NLOS) propagation presents unique challenges for radiation modeling.

Purpose of the Study:

• To present a novel propagation model for multiscatter radiation in the atmosphere.
• To characterize the behavior of radiation under conditions involving multiple scattering events.
• To validate the model against single-scatter approximations and real-world parameters.

Main Methods:

• Developed a Monte Carlo-based propagation model where scattering events are probabilistic.
• Utilized LOWTRAN7 for atmospheric coefficients and Mie theory for particle scattering characteristics.
• Simulated a wavelength-independent model, using 0.254 microm for analysis.

Main Results:

• The multiscatter model accurately reproduces single-scatter results when scattering count is one.
• Modified the single-scatter approximation formula to address non-line-of-sight (NLOS) propagation.
• Observed an impulse response duration of approximately 8 microseconds and an average scattering count of 3.85 at 1 km range, with single-scatter irradiance being a small proportion.

Conclusions:

• The developed model provides a more realistic representation of atmospheric radiation, especially under multiscatter conditions.
• The findings highlight the significance of multiscatter effects, even at relatively short ranges.
• This work offers new insights into atmospheric radiation characteristics, particularly for NLOS scenarios.