80 results about "S-matrix" patented technology

The present invention describes techniques that can be used to provide novel methods of spatial audio rendering using adapted M-S matrix shuffler topologies. Such techniques include headphone and loudspeaker-based binaural signal simulation and rendering, stereo expansion, multichannel upmix and pseudo multichannel surround rendering.

A staring imaging system inputs a 2D spatial image containing multi-frequency spectral information. This image is encoded in one dimension of the image with a cyclic Hadamarid S-matrix. The resulting image is detecting with a spatial 2D detector; and a computer applies a Hadamard transform to recover the encoded image.

The invention discloses a distributed optical fiber Raman temperature sensor coding and decoding by adopting sequential pulses, which is a distributed optical fiber temperature measuring system coding and decoding a signal on the basis of S-matrix transformation and carrying out optical fiber on-line positioning temperature measurement by utilizing the effect of optical fiber Raman light intensity modulated by temperature and an optical time domain reflection principle. The distributed optical fiber Raman temperature sensor can obtain better signal-to-noise radio under the condition of spending same measuring time by using a sequential multidigit laser pulse coding and decoding technology, increase the number of emitted photons, enhance the space resolution by narrowing the thicknesses of laser pulses and also effectively prevent the nonlinear effect of optical fibers by lowering the requirements on the peak value power of a single laser pulse; and in addition, the invention effectively solves the contradiction of space resolution enhancement-signal-to-noise radio reduction and signal-to-noise radio enhancement-space resolution reduction or measuring time increase of the traditional optical fiber distribution temperature sensor, enhances the temperature measuring precision, can be used for a distributed optical fiber temperature sensor which has ultra long range and high space resolution.

A receiver in a CDMA system comprises a front end processor that generates a combined signal per source. A symbol estimator processes the combined signal to produce symbol estimates. An S-Matrix Generation module refines these symbol estimates based on the sub channel symbol estimates. An interference canceller is configured for cancelling interference from at least one of the plurality of received signals for producing at least one interference-cancelled signal.

Performing approximate diagonalization of a correlation metric by user permutation to improve Multiuser Detector (MUD) processing. The system reorders the entries in the S-Matrix in order to move the bit decisions closer together in the decision tree. In one embodiment the reordering is a sequential pairwise correlation.

The embodiment of the invention provides a method and a device for measuring the particle size of soot particles. The method mainly comprises: building a scattering matrix of the scattered light of the soot particles according to the direct current component and harmonic wave component of the scattered light of the soot particle; and constructing a target function of the particle size parameter of the soot particles according to the scattering matrix, working out the optimal value of the target function by using the scattering matrix and the target function and by an inversion algorithm, and obtaining the particle size distribution of the soot particles according to the optimal value. According to the embodiment of the invention, the particle size inversion under a spherical model of the light scattering of soot particles in a fire disaster and the like by starting from a Mueller matrix which completely reflects the light scattering character of the particles, and thus, the particle size distribution of soot particles in a dire disaster and the like can be measured effectively.

A multiuser detector system with correlation based pruning including a parameter estimation module adapted to receive complex signals, and to produce estimated signature waveforms for each of K co-channel interfering signals. Pre-processing the estimated signature waveforms using an S-matrix module and producing a more valid set of hypotheses, wherein the S-matrix module uses apriori knowledge of an unnormalized cross correlation matrix, and processing the more valid set of hypotheses for pruning with an M-algorithm a multiuser detector module. An improvement to the M-algorithm in which the interference structure based on the signal correlation matrix used during the optimization process aids in selecting a better subset of hypotheses to test. This approach has the benefit of reducing computational complexity and improving performance over the existing M-algorithm

The invention discloses a method for positioning a low-frequency oscillation disturbance source of an electric power system, which comprises the following steps: 1) determining whether a low-frequency oscillation occurs in a power grid according to an S transformation image; 2) extracting amplitude frequency information in an S transformation matrix which corresponds with an active power signal that is actually measured by each power generator set and each tie line phasor measurement unit (PMU), determining an object with the low-frequency oscillation and a corresponding dominant oscillation frequency; 3) extracting time and amplitude information which correspond with the dominant oscillation frequency in each S matrix, determining the object in which the low-frequency oscillation firstly occurs and a corresponding time point tk; and 4) determining the disturbance source of the low-frequency oscillation based on a disturbance time correlation analyzing method. The method of the invention has functions of quickly locking the disturbance source, helping a dispatcher to quickly and accurately analyze the reason of oscillation, taking effective control measures in time for quickly stopping oscillation, and preventing further enlargement of the fault.

The invention relates to a method for obtaining an intermediate resonance factor in a reactor multigroup nuclear database. On the basis of a free gas model, a continuum energy neutron scattering matrix expression Sigma<r, s, T> (E->E') of the resonance absorption nuclide relevant to the temperature TK is obtained through formula derivation; a neutron slowing down equation is solved on the basis of the continuum energy neutron scattering matrix at the temperature TK to obtain the neutron-flux density at the temperature TK; the multigroup adsorption cross section of the resonance absorption nuclide at the temperature TK is further worked out through group merging calculation; the intermediate resonance factor is finally obtained through the intermediate resonance factor calculation; and an intermediate resonance factor multinomial coefficient using the temperature and the background cross section as independent variables is obtained by a least squares fitting method. The method provided by the invention has the advantages that the intermediate resonance factor after the intermediate resonance factor calculation is more accurate; the calculation precision and the calculation efficiency of the intermediate resonance factor are improved; and finally, in the reactor physical calculation, the resonance calculation precision is improved, and the resonance calculation speed is accelerated.

Provided is a high-accuracy fast neutron reactor assembly few-group cross section obtaining method. The fine-group cross section of a fast neutron reactor assembly is calculated in the mode that point cross section data and multi-group data are combined, online calculation of an elastic scattering matrix is performed, a neutron transport equation is solved by using the fine-group cross section to obtain fine-group neutron-flux density, energy groups are merged on the basis, and accordingly few-group parameters of the fast reactor assembly are obtained. Due to the fact that the method directly uses the point cross section data, the elastic scattering resonance effect of a medium mass nuclide and the resonance interference effects of all nuclides are accurately considered. The neutron-flux density of a real system is adopted in the energy group merging process, and merging results are more accurate. The overall errors of fast reactor assembly few-group parameters calculated by adopting the method are within 1% compared with a reference value, and the method has higher accuracy.

The invention discloses a microwave photonic radar fully polarimetric radar detection method. The method includes the following steps that: 1, up-conversion processing is performed on optical carriers, complex baseband signals and radio frequency local oscillation signals in an optical domain, so that two orthogonal paths of radio frequency signals, and one path of optical reference signals are generated; 2, the two orthogonal paths of radio frequency signals are respectively sent to a horizontal polarization antenna and a vertical polarization antenna, and the horizontal polarization antennaand the vertical polarization antenna radiate two orthogonal paths of polarized electromagnetic waves, so that the polarized electromagnetic waves irradiate a target, and the horizontal polarization antenna and the vertical polarization antenna receive the echoes of the target, so that two paths of echo signals are obtained; and 3, the two paths of echo signals and the optical reference signals are subjected to deramp and polarization response separation processing in the optical domain, so that four paths of intermediate-frequency analog electrical signals corresponding to four elements in atarget polarization scattering matrix are obtained; and 4, the four paths of intermediate-frequency analog electrical signals are processed, so that target detection information can be obtained. The invention also discloses a microwave photonic radar fully polarimetric radar. With the microwave photonic radar fully polarimetric radar detection method and the microwave photonic fully polarimetric radar of the invention adopted, a problem that the bandwidth of a fully polarimetric radar is limited, the problem of the structural complexity of the fully polarimetric radar and a problem that it isdifficult for the fully polarimetric radar to realize instantaneous measurement can be solved.

A near field microscope of optical band consists of near field viewfinder, near field coding plat , light wave guide for switching over , beam splitting system and photoelectric probe . It features setting near field coding plate as sub wavelength microhole array circulated as per S matrix distribution with microhole diameter being less than r value in Rayleigh criterion, picking up light coming from viewfinder and extracting it in microhole and converting it to be conduction wave for being sent to the following device.

The invention discloses a distribution-type optical-fiber Raman temperature sensor adopting circulating pulse coding and decoding and Rayleigh demodulation, and the sensor comprises a pulse optical-fiber laser, an acoustic-optic demodulator, an integrated optical-fiber wavelength division multiplexer with four ports, two photoelectric receiving amplification modules, a coding-decoding demodulation digital signal processor, an optical-fiber temperature sampling ring, an intrinsic temperature measuring optical fiber, a digital temperature detector and a personal computer (PC). The sensor codes and decodes a signal on the basis of the circulating S matrix conversion, and the online location temperature measurement of the optical fiber is realized by utilizing an effect that the optical-fiber Raman optical strength is demodulated by the temperature and utilizing an optical time domain reflection principle. The circulating laser pulse coding and decoding is realized, and a Rayleigh channel is used as a temperature demodulation reference channel, so that the signal-to-noise ratio of the system is greatly improved, and the measuring precision and the measuring distance of the system are improved.

The invention relates to a construction method for a special structure protograph QC-LDPC code based on a Pascal's triangle, and belongs to the technical field of channel coding research. The method utilizes the Pascal's triangle to construct a matrix, and specifically comprises the following steps of constructing a weight matrix of the protograph, namely a base matrix Hbase; performing anticlockwise rotation by using the Pascal's triangle structure to acquire an S matrix; filling elements in the S matrix into the weight matrix Hbase of the protograph according to a rule to acquire a base matrix H of the protograph; extending the protograph base matrix H via a zero matrix and a unit matrix to acquire a check matrix, and providing a fast iterative coding algorithm of the codon according tothe structure of H. The base matrix has a quasi bidiagonal structure, avoids four rings and can achieve fast coding, is reduced in coding complexity, and has better iterative decoding performance without significant error floors.

In a wireless sensor actuator network system, actuators to be actuated to correspond to a plurality of sensors are selected using an A-S matrix that represents relationship strength between a plurality of actuators and the plurality of sensors based on sensing data of the plurality of sensors, and only the selected actuators determine actuation values based on values of the A-S matrix.

Methods and apparatus for concentrating light into a specified focal volume and for collecting light from a specified volume. Incident light is coupled through a plurality of successive transmissive asymmetric microstructure elements. The succession of transmissive asymmetric microstructure elements may be designed by representing an electromagnetic field as a linear combination of eigenmodes of one of the succession of transmissive asymmetric microstructure elements. The asymmetric microstructure elements are represented as a plurality of mesh lattice units and eigenmode solutions to Maxwell's equations are obtained for each mesh lattice unit subject to consistent boundary conditions. S-matrix formalism is employed to calculate a field output and weighting coefficients for the eigenmodes are selected to achieve a specified set of field output characteristics.

The invention discloses a rotating-reflection-surface-based imaging method and system of a mirroring synthetic aperture radiometer. The method comprises: according to an antenna array, a reflection surface angle, and a distance between the reflection surface and the antenna array, an output function of the antenna array is obtained; a scene brightness temperature of the output function is discretized into a summation form to obtain a matrix equation containing scene brightness temperature image information; the reflection surface is rotated and the inclination angle of the reflection surface is changed by S times to obtain S matrix equations containing the scene brightness temperature image information, wherein the S is larger than or equal to 2; the S matrix equations containing the scene brightness temperature image information are combined into a target matrix equation; and the target matrix equation is inversed to obtain a scene brightness temperature image. The larger the frequency of rotation of the reflection surface, the smaller the angle of the rotation each time; and the larger the combined target matrix equation, the higher the scene brightness temperature image quality.

The invention relates to a cell sorting method for an affine propagation clustering, which comprises the following steps: (1) selecting a circularity parameter C and a rectangularity parameter R of a cell image, designing a sample coordinate X sample=lambda C+(1-lambda) R, selecting an area parameter Area of the cell image as another sample coordinate Y sample and selecting a nuclear-cytoplasmic ratio parameter prop of the cell image as another sample coordinate Z sample, wherein lambda represents a prior input value; (2) using euclidean distance of the three-dimensional sample coordinates as sample distance, wherein a diagonal value of an S matrix of the affine propagation clustering is an average value of distances among the samples; (3) under the initial condition, setting an membership grade matrix A(i, k)=0, updating a matrix R and updating a matrix A; and (4) stopping after the number of iteration times is set and obtaining different types of cells from a sorting result. The invention provides the cell sorting method for the affine propagation clustering, which is suitable to process mass data, has excellent real-time property and can effectively carry out cell sorting.

The problem of modeling and designing a structure including a planar element(s) (e.g., antenna, RF circuit, etc.) arranged in association with a non-planar element(s) (e.g., non-planar packaging, a non-planar scattering element, a complex meta material, a periodic array element, etc.), in a computationally efficient and rigorous manner is solved by (1) modeling each of the planar elements using both conventional space-spectral analysis and complex space-spectral analysis to obtain an electro-magnetic (EM) signature matrix for each planar element, (2) determining (e.g., using a brute force modeling based on Maxwell's equations, by measuring experimentally, or by reading one from a stored library) an EM signature matrix (e.g., reflection and scattering matrices) compatible with those of the planar elements, for each of the non-planar elements, and (3) combining the EM signatures of the elements using matrix analysis to obtain a complete EM signature the structure.

The invention discloses a polarization synthetic aperture radar calibration method based on natural bare soil. The method comprises the steps that the crosstalk and cross polarization channel imbalance parameters of a POLSAR radar image are estimated and removed at first; then, the POLSAR radar image is parted in the distance direction and the azimuth direction; finally, an optimization function is built with the low spirochete ingredient of real soil as an optimization object, and imbalance of a same polarization channel is solved through the characteristic that blocks in the same distance direction have the identical unknown numbers. The weak scattering characteristic of the spirochete of the natural bare soil is utilized, calibration is carried out on emission and receiving distortion matrixes existing in a POLSAR radar system, biased observed values are re-calibrated to be a real scattering matrix, and powerful guarantees can be provided for a radar in the application aspects of territorial resources surveys, natural disaster emergency responses and the like.