38 results about "Scattering channel" patented technology

The application discloses a high dynamic receiving device based on two-dimensional dynamic reconstruction, and belongs to the technical field of high-speed wireless communication. The device is composed of a low-noise amplifier, a frequency converter, an amplification and filtering unit, an A / D sampler, a baseband preprocessor, a synchronization extractor, a high dynamic receiving signal reconstruction unit, a transfer function two-dimensional corrector, a high-efficiency decoding unit and a service interface unit. According to the high dynamic receiving signal reconstruction technology and the time delay-frequency shift domain two-dimensional correction technology, the application improves the anti-interference ability, the anti-frequency offset ability and the anti-multipath time delay ability of the system without increasing the signal bandwidth, and is especially suitable for high-speed communication of wireless channels such as microwave channels and scattering channels.

The invention discloses a magnetic field enhanced Fe-Tiamp; the invention discloses a biomass porous carbon low-frequency wave-absorbing composite material and a preparation method thereof, and relates to the field of wave-absorbing materials. The magnetic field is used for enhancing Fe-Tiamp; according to the biomass porous carbon low-frequency wave-absorbing composite material and the preparation method thereof, graphitization of a carbon material is promoted through Fe ion catalysis, the conductivity of the material is remarkably improved, and efficient conduction loss is achieved; fe / Ti and a carbon matrix form a multi-phase interface, so that the interface polarization effect can be enhanced, and the dielectric loss capability is improved; a strong magnetic field induces Ti-C and Fe-C phase reconstruction to form a magnetic-dielectric synergistic effect, so that the material shows a better impedance matching characteristic in a low-frequency band; the porous structure provides a multi-stage reflection and scattering channel, so that the electromagnetic wave propagation path can be prolonged, and the attenuation capability is enhanced; the preparation process conditions are controllable, the adaptability is high, and the obtained material is light in weight, thin in thickness and suitable for being applied to flexible devices and portable equipment.

The application discloses a kind of based on optical gain's ultra-scattering and zero forward scattering synergic control system and method, it is related to optical scattering enhancement technical field.Method includes constructing space rectangular coordinate system, let cylindrical scatterer be placed vertically along z axis, transverse magnetic wave is emitted by emission device along x axis incidence, emission device emits transverse magnetic wave, let transverse magnetic wave and cylindrical scatterer interact, total magnetic field in the free space of cylindrical scatterer coordinate is detected using detection device, based on total magnetic field, scattering coefficient of different scattering channels of cylinder and total scattering cross section are obtained, based on scattering coefficient and total scattering cross section, key parameters for controlling scattering intensity and directionality are obtained, scattering pattern is obtained by adjusting key parameters of cylindrical scatterer.The application provides a new way for designing advanced optical devices applied in subwavelength antenna, optical communication, radar sensing and imaging and other fields.

The invention discloses an all-sky background radiometer full-channel calibration method based on spectral inversion, and the method comprises the steps: obtaining a discrete response value of a non-absorption wave band of an all-sky background radiometer based on solar direct radiation and a Langley calibration method in combination with the solar irradiance of an atmospheric boundary layer, the atmospheric relative quality and a sun-ground distance correction factor; a solar direct radiation and gas absorption calibration method is utilized, a gas absorption effect is considered, and a discrete response value of an absorption wave band is calculated through inversion of the total amount of water vapor; determining a full-band discrete irradiance calibration coefficient based on the discrete response values of the non-absorption band and the absorption band; fitting by using the full-band discrete irradiance calibration coefficient and adopting an interpolation algorithm to obtain a full-band instrument irradiance calibration function; and transmitting an instrument irradiance calibration function to the direct incidence channel and the scattering channel, and obtaining radiance calibration coefficients of the direct incidence channel and the scattering channel in combination with the field angle and the attenuation coefficient of the optical filter, thereby completing full-channel calibration.