4 results about "Scattering function" patented technology

The present application relates to a kind of multi-dimension gradual scattering light guide plate, processing method and backlight plate, and the light guide plate includes substrate layer and scattering function layer.Substrate layer and scattering function layer are closely adhered, and substrate layer and scattering function layer are respectively made of different light-transmitting material composite;Scattering structure is gradually distributed along at least two dimensions on the light guide plate, scattering structure penetrates substrate layer and scattering function layer, scattering structure is misaligned arrangement in adjacent column in plane, and misalignment amount is 1 / 2-2 / 3 of column spacing;Light guide plate includes light inlet end and light outlet end, in the direction of light outlet end towards light inlet end, the distribution density of scattering structure gradually increases, in the direction of substrate layer towards scattering function layer, the size of scattering structure gradually decreases.Scattering structure gradually increases along light inlet end to light outlet end density, gradually decreases along substrate layer to scattering function layer size, and misaligned arrangement in adjacent column spacing in plane, it is favorable to eliminate bright and dark stripe, let light emitting surface brightness distribution be more uniform.

This invention relates to the field of shortwave antenna communication channel testing and modeling technology, specifically to a method for measuring the angular power spectrum of an antenna in a shortwave skywave scenario. The method includes: the receiver performing a two-dimensional equally spaced angular scan within a preset azimuth and elevation range; establishing an angular power spectrum measurement equation based on the received signal power, antenna pattern, and noise power channel, using the scattering function; convolving this equation with the pattern to obtain the angular power spectrum within a single path; discretizing the single-path received power matrix and antenna pattern matrix in two dimensions, and then performing zero-plugging expansion on each; converting the discretized single-path received power matrix and antenna pattern matrix into two-dimensional frequency domain matrices, and determining the frequency domain ratio between the received power matrix and the antenna pattern matrix mapped to the angular domain using time-delay Doppler domain parameters. This invention improves the accuracy of angular power spectrum measurement in shortwave skywave channels while reducing the dependence of traditional empirical modeling methods on a single propagation assumption.

This invention relates to shortwave communication technology, and particularly to a shortwave MIMO channel modeling method based on multi-domain coordination of time-space-frequency-polarization-angle. The method includes: constructing a nonlinear array of transceiver antennas; determining the geometric relationships of element spacing, element velocity, distance from the reflector cluster to the antenna, and reflector cluster velocity based on three-dimensional vectors; establishing a path transmission delay characterization mechanism jointly determined by propagation distance, the number of inseparable multipath paths, and time-difference statistical characteristics; decomposing the distance from the element to the reflector cluster into time-space stationary and non-stationary terms; establishing a polarization matrix and performing amplitude-phase weighting on multipath components with different arrival and departure angles; obtaining the existence and disappearance states of the path over time based on the reflector cluster probability model combined with Markov processes; incorporating the influence of antenna polarization on channel amplitude into the channel expression; and generating impulse response and corresponding scattering functions using the obtained angular power spectrum, delay domain model, and time-varying path state model. This invention improves the polarization adaptability of large-scale arrays to actual arrays.