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In the paper the development of the solution method of the radiative transfer equation for the calculation of a light field of a point unidirectional source in the confined scattering medium volume is offered. The method is based on the analytical elimination of an anisotropic part from the solution on the basis of the small angle modification of the spherical harmonics method and the statement of the boundary‐value problem for the rest.

The singularity subtraction on the vectorial modification of spherical harmonics method (VMSH) of the solution of the vectorial radiative transfer equation boundary problem is applied to the problem of influence of atmosphere parameters on the polarimetric system signal. We assume in this model different phase matrices (Mie, Rayleigh, and Henyey‐Greenstein), reflecting bottom and particle size distribution. The authors describe the main features of the model and some results of its implementation.