50results about How to "Orthogonal" patented technology

The invention discloses a polarization diversity double-channel speed and distance measuring coherent laser radar measurement method and device. A laser beam output by a laser source is divided by a first polarization beam splitter into a speed measurement light beam and a distance measurement light beam which are orthogonally polarized; the speed measurement light beam adopts quadrature demodulation coherent homodyne Doppler for laser speed measurement; and the distance measurement light beam uses pseudo-random code high-speed phase modulation for laser distance measurement. The speed and distance of a long-distance target are measured precisely and synchronously by means of polarization diversity, the whole system is small, operation is easy, and the development prospects are good.

The invention provides an optimal design method of a cross-flow fan based on an orthogonal test, comprising the following steps of: with a volute gap, a volute tongue gap, a circumferential angle inside blades, a circumferential angle outside the blades, the number of blades, the ratio of an inside diameter and an outside diameter of an impeller, a torsion angle of the blades and the like as simulated optimal structural parameters, i.e., test factors, taking n different numerical values, i.e., test levels from each structural parameter; computing performance indexes (air quantity, frequency, noise and the like) of the cross-flow fan under such a group of structural parameters by using a computational fluid dynamics (CFD) method for each test by using an orthogonal table Lp (p<=30); and finding a group of optimal structural parameters according to performance index parameters and corresponding weights. If the requirement for performance indexes is very high, n' different test levels for the computed optimal structural parameters can be taken near the value aiming at each test level of the test factors, and then the performance indexes are computed repeatedly by using an orthogonal table Lq to obtain a group of more optimal structural parameters. The method is simple and feasible, low in cost and short in time, and the designed product has good performance.

The invention discloses an asymmetric triangle frequency modulation radar communication integrated signal waveform determination method. An integrated signal waveform is an asymmetric triangle and is composed of two segments of liner frequency modulation signals with opposite frequency modulation rate symbols. First of all, a bandwidth B and a time width T of an integrated system are determined; the system time width T is divided into two segments, and time lengths are respectively T1 and T2; the tuning rate symbols of the two segments of the linear frequency modulation signals are opposite, the bandwidth B is the same, and tuning rates of the two segments of the linear frequency modulation signals are respectively calculated; the first segment of signals are used for synchronous capture of communication signals, and communication information is not modulated; for the second segment of signals, communication bit information is modulated segment by segment; and phase continuity of the two segments of signals is ensured, and an expression of integrated signals on the whole time width T is finally obtained. According to the invention, waveform integration of a radar and the communication signals can be realized, a part of integrated signals are taken as a synchronization sequence for synchronization of a communication system, the communication bit information is modulated segment by segment for the residual part of the integrated signals, and the whole integrated signals are taken as radar emission signals.

The invention discloses a strategy execution method and device based on a multilayer diversion experiment frame. The method includes steps of 1, distributing a part of flow for strategy combination; 2, reading strategy nodes in strategy links according to sequence; 3, judging whether strategy nodes meet the constraint conditions or not and executing a step 4, or returning to step 2 to read the next strategy node; 4, judging the strategy type, executing a step 4 for distributing strategies to flow labels, and executing a step 6 for experiment strategies; 5, distributing the flow labels for flows, returning to the step 2 to read the next strategy node; 6, realizing the strategy logics and returning to the step 2 to read the next strategy node. The strategies for multiple experiments to be carried out are distributed to multiple experiment layers according to relevancy of the strategies, orthorhombic flow labels are distributed to different experiment layers through algorithm, and multiplexing of flow is realized. Strategy configuration can be performed by the strategy link, so that configuration is provided with high readability and maintainability.

The invention relates to a method for sending a downlink detection reference signal in a TDD (time division duplex) system. The method comprises the following steps that a basic reference signal set is generated, a base station selects a basic reference signal from the basic reference signal set according to the identity information of the base station, and the reference signal of each antenna is obtained according to the basic reference signal as well as the sending antenna number and the antenna serial number of the base station; a cyclic prefix is added onto the antenna reference signal of each antenna to form the detection reference signal, and in addition, the detection reference signal is sent on the fixing position of each downlink subframe. The orthogonality exists among the reference signals sent by a plurality of antennas, so the aliasing among different antenna signals is avoided. The mutual correlation of the reference signals among different cells is low, and the interference among the downlink detection reference signals of the adjacent cells is reduced. The downlink detection reference signals independent from the data are adopted, the interference caused by data pilot frequency sending at unnecessary time slots and frequency is avoided, and the same-frequency networking is favorably realized.

The emission diversity based on space-time code has space, time and code gains. Wherein, the space-time block code is simple; but, the code efficiency when emission antenna number is larger than 2 opposite to complex signal, and the scheme just fits to quasi-static fading channel. In CDMA system, the scheme uses cycle space-time block decoding method and orthogonal spread-spectrum code to different antennas, simplifies decode same as traditional code, and can improve anti-channel attenuation and system transmission performance.

The invention provides a method for dividing and rebuilding a video coding predictive residue block, and belongs to the technical field of video coding in signal treatment. The invention aims to reduce the blocking effect due to the prior DCT transformation matrix and solve the problem that the value of the matrix cannot be adjusted. The division method comprises a predictive residue block classification step, a transverse division step of first, third and second multi-channel filter groups, a classification step of transverse division coefficient matrixes and a longitudinal division step of the first, the third and the second multi-channel filter groups; and the rebuilding method comprises a classification step of the division coefficient matrixes of the predictive residue block, a longitudinal rebuilding step of the first, the third and the second multi-channel filter groups; a classification step of the transverse division coefficient matrixes and a transverse rebuilding step of the first, the third and the second multi-channel filter groups. The method has the advantages of effectively removing correlation, reducing the blocking effect due to the size mismatching of the DCT transformation matrix and the predictive residue block, and improving subjective and objective qualities of coding.

The invention discloses a design method of a free-form surface wavefront compensation element for a laser system. The method comprises the steps of detecting distortion wavefront outputted by the laser system through a distortion wavefront detector, and transmitting discrete slope data (Sx, Sy) of the distortion wavefront obtained by measurement to a computer; fitting the discrete slope data witha numerical orthogonal polynomial as a primary function by use of a multi-parameter optimization design method, performing surface reconstruction by use of a mode method to obtain a distortion wavefront representational polynomial W; and according to the wavefront phase complementarity principle, calculating a surface representational polynomial W* of the free-form surface wavefront compensation element required for compensation of the distortion wavefront of the laser system to implement correction of the distortion wavefront of the laser system. The method can be used for complicated shape wavefront, is high in fitting precision, good in thermal stability, and is suitable for distortion wavefront compensation of the high-power laser system.

The invention discloses a fluorescence characteristic standard spectrum library for identifying paralytic shellfish poisoning-producing microalgae as well as a construction method and application of the fluorescence characteristic standard spectrum library. The method comprises the following steps of: extracting three-dimensional fluorescence spectrum information of PSP-producing algae and non-PSP-producing algae growing under different environmental conditions, extracting characteristic peaks of experimental algae by using a Db7 wavelet function, performing clustering analysis by using a system clustering method, removing abnormal spectrums, and screening standard spectrums to obtain a Db7 fluorescence characteristic standard spectrum library. When a discriminating function established according to the fluorescence characteristic standard spectrum library is used for discriminating the PSP-producing algae and the non-PSP-producing algae, the discriminating correct rates are 84.6% and95.6% respectively, the correct rates are very high, and the purpose of quickly and accurately identifying the poisoning-producing algae is basically achieved. The fluorescence characteristic standardspectrum library can be used for preparing a red tide algae identification sensor or a portable algae fluorescence identification instrument.

The invention discloses a method for framing modulation of anti-noise wireless multimedia broadcast signals of a single-frequency network, relating to a time domain-frequency domain-spatial domain hybrid framing modulation scheme. The method for the framing modulation of the anti-noise wireless multimedia broadcast signals of the single-frequency network has the advantages of low peak-to-average power ratio, short synchronization time, channel fading resistance, multi-service controllability, and the like.

The invention discloses a method for modulating framing of anti-noise mobile signals of a multimedia broadcast single-frequency network, and relates to a time domain/frequency domain/air space mixed framing modulating scheme. The method for modulating framing of anti-noise mobile signals of the multimedia broadcast single-frequency network has the advantages of low peak-to-average power ratio, short synchronization time, resistance to channel noise, controllable multiple services and the like.

The invention discloses a multi-beam feed network design method based on a 180 DEG directional coupler. The method comprises the following steps: S1, executing a feed network structure design scheme according to the demands of an application scene, and obtaining a feed network cascade structure; S2, executing a device optimization design scheme according to the feed network cascade structure to obtain an optimization result; S3, determining the power distribution ratio of the 180 DEG directional coupler according to the optimization result; S4, obtaining a specific structure of the 180 DEG directional coupler according to the power distribution ratio; and S5, cascading the plurality of 180 DEG directional couplers to obtain a final comprehensive multi-beam feed network. The multi-beam feed network design method based on the 180 DEG directional coupler can solve the technical problem that an existing multi-beam feed network cannot give consideration to the number of network ports and the beamforming requirement at the same time.

The invention discloses a space time code transmission method and a decoding method in a Y information channel and is suitable for three users and the Y information channel where the user and a relay node are all configured with two antennas. In multiple-access stage, each user performs Alamouti coding and pre-coding to a modulating signal thereof, and transmits pre-coded codons twice according to certain rules while the relay node performs linear operation to a receiving signal so as to reduce the number of codons which are mutually interfered with each other and decodes by using an orthogonal property of an equivalent channel matrix corresponding to the Alamouti codons; in broadcast stage, the relay node transmits signals obtained by decoding in the multiple-access stage after performing the Alamouti coding at twice, and the three users use the orthogonal property of the equivalent channel matrix corresponding to the Alamouti codons to decode the signals transmitted by the relay node, thereby obtaining signals which expects to receive by the users themselves.