INCREASING OF AIMING AND SEARCH SYSTEM OF LAND UNMANNED COMPLEX DURABILITY

Proposals on composition of the aiming and search system of land unmanned complex are offered. The work aims to improve one of the most important technical characteristics of land unmanned complex - survivability. Proposals are given for improving the layout of aiming and search system of land unmanned complex. Existing composition schemes have a low firing life because of the devices included in its structure have are installed into general body. Sniper impact in body makes ineffective all aiming and search system. Authors proposes to install the devices into two bodies along weapon sides. TV-sight should be installed into the first body and thermal-vision sight should be installed into the second body. Then if sniper impact is affecting one body, then the devices of the second body are able to execute a battle task with some limitations thanks to efficient sight. The issues of controlling the stability of the aiming line of the aiming and search system at the stage of bench tests using a collimation-measuring unit are considered in detail. A technique for adjusting both television and thermal imaging sights is proposed. In addition to increasing the survivability of the entire unmanned complex, the proposed technical solution has a number of other advantages. First, the "cold" zeroing of the combat module is greatly simplified. Instead of a system of two penta mirrors, a BS-0 ° rhombus prism can be used for this. Secondly, the proposed layout potentially simplifies the further modernization of aiming and search system, which would require the inclusion of additional units. For example, to expand the functionality of the complex by analyzing the polarization of radiation from objects and backgrounds, an additional volume is provided to accommodate polarimetric attachments. Thirdly, an even greater increase in the survivability of the complex can be achieved by increasing the secrecy of the combat mission. Usage of the base distance between the entrance pupils of the sights makes it possible to passively measure the range to the target using the internal base rangefinder instead of the laser rangefinder.

Феноменологическая модель нелинейных оптических свойств топологической среды

Based on the quasi-classical description of electron dynamics in topological media, the gyrotropic prop-erties of which are due to the non-zero Berry curvature, the phenomenological model is proposed. Model allows us to consider some nonlinear optical processes – the generation of the third harmonic and the rotation of the wave polarization vector depending on the intensity. Third-order nonlinear sus-ceptibilities, which determine the interaction of waves taking into account the rotation of the wave po-larization vector, are determined. Gyrotropicity manifests itself in the dependence of the harmonic con-version efficiency on the circular polarization of radiation, which can be used to measure the parameters of this media.

Intensity and Polarization of Radiation Emerging from Rotating Accretion Disc with Increasing Height

We consider the radiation emission in continuum and spectral lines from rotating accretion disc with the progressive increasing height. It is known that for the plane accretion disc with homogeneous atmosphere the wave electric field E is perpendicular to the plane between line of sight n and the normal to the disc N. For the expanding accretion disc the wave electric field from every inclined cone-like part with given azimuthal angle φ has direction perpendicular to the plane between n and local normal N′ to the inclined surface. This behaviour is the consequence of homogeneity of inclined atmosphere and has purely geometrical origin. The geometrical consideration shows that the position angles of polarized radiation in the right and left parts relative to plane (nN) of the inclined accretion disc have opposite values. Therefore, for inclined accretion disc the integral continuum radiation has the usual polarization angle perpendicular to the plane (nN), but smaller degree of polarization and less alongated along the normal N than that for the plane accretion disc. For spectral line, due to the Doppler effect, the polarization (position) angles have opposite signs for the red and blue wings. Such behaviour is frequently observed in Hα-radiation.

Chaotically magnetized atmosphere with dust

ABSTRACT We consider the influence of absorbing dust particles on the intensity and polarization of radiation in chaotically magnetized atmospheres. The Milne problem is considered. It is known that the existence of absorbing dust particles leads to more elongated intensity distribution along the normal to the atmosphere and increasing of polarization degree near the direction perpendicular to the normal. The chaotic Faraday rotations practically do not change the intensity distribution, but they decrease the polarization degree. How looks the picture when the atmosphere is chaotically magnetized and contains the absorbing dust particles? Usually one assumes that such atmospheres exist in active galactic nuclei in Seyfert galaxies, both in accretion discs and gas–dusty toruses. In particular, we establish when both mechanisms cancel one another and the resulting polarization is near to ordinary atmosphere without the magnetic field fluctuations and absorbing particles. Of course, the angular distribution mostly corresponds to the level of existing dust particles, because it is practically independent of polarization.

Polarization of Radiation by the Aerosol-Gas Component of the Atmosphere for Lidar Wavelengths

The report presents an original algorithm for solving the radiation transfer equation based on the Monte Carlo method for problems of atmospheric laser sensing, taking into account the polarization of radiation. A number of test calculations were performed to analyze the data of the polarization scanning lidar of the V.E. Zuev Institute of Atmospheric Optics SB RAS. It is shown that the proposed algorithm, taking into account the polarization, makes it possible to reduce the discrepancy in interpreting lidar data in comparison with the algorithm without taking into account polarization.

Parameter optimization for the three-frequency feed for the mirror antenna of the non-linear radar

Analyzed below is a radiating structure represented by a flat self-complementary three-sector structure fed by three segments of the microstrip line and located above the stepped metal screen, and to be used as an exciter for the non-linear radar antenna. When proper matching with the feeding coaxial cable is achieved, results of the numerical simulation proved that the antenna can provide near-circular polarization of radiation at the probing signal frequency, and linear polarization at the second and third harmonics of this signal.