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32 results about "Self association" patented technology

Carrier frequency deviation estimation algorithm based on known sequence interference self-association

The invention is a self-correlation carrier frequency deviation estimation algorithm based on known serial correlation and the implementation device thereof, belonging to the field of digital information transmission technology. The algorithm comprises: coherent demodulating the original receiving sequence to get a coherent demodulation receiving sequence by emitted known sequence; self-correlation calculating the coherent demodulation receiving sequence to get a self-correlation sequence; phase angle calculating the self-correlation sequence to get original self-correlation phase angle sequence; differentiating, modular operating and summarizing the original self-correlation phase angle to get a new self-correlation phase angle sequence; and calculating carrier frequency deviation estimation according to the new self-correlation phase angle sequence and original self-correlation phase angle result. By introducing phase angle differentiation, modular operation and summarization, the invention eliminates the phase angle blurring problem in simple frequency deviation estimation algorithm, realizes linear frequency deviation estimation having maximal estimated scope and minimum variance; the invention also further lowers the linear frequency deviation estimation of estimated variance when maximizes the estimated scope.
Owner:TSINGHUA UNIV

Method for preparing methyl cellulose and lipid packaging film

The invention relates to a method for preparing a methyl cellulose and lipid packaging film, and belongs to the technical field of food packaging. Methyl cellulose and a lipid are used as main film forming materials, and a plasticizing agent is used as an accessory material. The preparation method comprises the following steps: (1) weighing methyl cellulose, adding a hot ethanol water solution into the methyl cellulose, and adding the plasticizing agent and the lipid after the methyl cellulose is fully dissolved to form a mixed film liquid; (2) performing a synergistic processing of microwave and ultrasonic on the mixed film liquid, forming a film through tape casting, drying and taking out the film to obtain the methyl cellulose-based composite food packaging film. Compared with the prior art, the lipid-containing methyl cellulose film liquid is subjected to the synergistic processing of microwave and ultrasonic to prompt the crystallization of a lipid substance on the surface of a methyl cellulose substrate through a self-association effect, so that a dense lipid layer is formed and a double-layer structure is formed finally. The double-layer film prepared by the method is non-toxic, edible and biodegradable, can be formed by only one tape casting, is simple in film preparation process, meanwhile, has excellent mechanical and moisture-resistant properties, and can be used as a food inner package.
Owner:SHANGHAI JIAO TONG UNIV

Carrier frequency deviation estimation algorithm based on known sequence interference self-association

The invention is a self-correlation carrier frequency deviation estimation algorithm based on known serial correlation and the implementation device thereof, belonging to the field of digital information transmission technology. The algorithm comprises: coherent demodulating the original receiving sequence to get a coherent demodulation receiving sequence by emitted known sequence; self-correlation calculating the coherent demodulation receiving sequence to get a self-correlation sequence; phase angle calculating the self-correlation sequence to get original self-correlation phase angle sequence; differentiating, modular operating and summarizing the original self-correlation phase angle to get a new self-correlation phase angle sequence; and calculating carrier frequency deviation estimation according to the new self-correlation phase angle sequence and original self-correlation phase angle result. By introducing phase angle differentiation, modular operation and summarization, the invention eliminates the phase angle blurring problem in simple frequency deviation estimation algorithm, realizes linear frequency deviation estimation having maximal estimated scope and minimum variance; the invention also further lowers the linear frequency deviation estimation of estimated variance when maximizes the estimated scope.
Owner:TSINGHUA UNIV

Method and device for measuring two-dimensional infinitesimal displacement with single primary color by using computer camera

InactiveCN102102982AReduce the amount of calculation and analysisFast measurementUsing optical meansCorrelation coefficientLength wave
The invention relates to a method and device for measuring two-dimensional infinitesimal displacement with a single primary color by using a computer camera, and further provides a method and device for contactless displacement measurement with a computer camera. The device comprises a computer and a computer camera, and is provided with a camera shooting and single-color frame matcher. In the invention, the texture of a reflective surface of an object to be measured can be analyzed by adopting a brightness self-association coefficient calculation method and the size of a comparison window is automatically regulated; one of three primary color frames is selected as an object to be measured, primary color frames selected for a former and a later frames are subjected to a cross correlation matching computation to determine that the highest frame-frame correlation degree is achieved when the cross correlation coefficient value is minimum and close to zero, thereby an instant displacement, a total displacement and an instant speed are obtained; whether to upgrade a reference frame or regulate the position of the comparison window is determined according to result on the instant displacement, the total displacement and the instant speed, the size of a cross association operator array which is used for search matching is regulated automatically; therefore, the method and the device are favorable for overcoming the impacts of other wavelengths and changes to the measurement, and further improving the measurement speed.
Owner:CHONGQING TECH & BUSINESS UNIV

Community shared service method and system based on Internet of Things

The present invention discloses a community shared service method based on the Internet of Things. The method comprises that: a plurality of community information of at least one communication terminal user is obtained; the communication terminal compares the first virtual public service weight with the first virtual service threshold to determine whether public service metadata corresponding to each service content can be associated with a first virtual public service group; the communication terminal compares the first virtual consumption weight with the first virtual consumption threshold to determine whether consumption metadata corresponding to each consumption information can be associated with a first virtual consumption group; the first virtual public service group and the first virtual consumption group form a first virtual group; and the first virtual group of the communication terminal user and the first virtual group of at least one social user of the communication terminal execute self-association according to the first key. The present invention further discloses a community shared service system based on the Internet of Things for implementing the method. By virtue of the technical scheme of the present invention, self-association of metadata between the communication terminal and the social user can be realized, the Internet of things is more convenient, and the trouble of negative commented metadata is eliminated.
Owner:福建省南盛网络科技有限公司

Method for measuring small two-dimensional displacement by using three primary colors of computer camera

InactiveCN102052898BImprove the ability to resist environmental light radiation interferenceAdvanced measurement technologyUsing optical meansRelative displacementInterference resistance
The invention relates to a method and a device for measuring small two-dimensional displacement by using three primary colors of a computer camera, and provides a method and a device for performing non-contact measurement on displacement by taking the computer camera as a displacement sensor. The device is formed by connecting a camera and an ordinary computer, is configured with a camera filmingprogram and a three-primary color luminance frame matching program and can acquire the optimum matching comparison window by self-association calculation on a reference frame; three primary color image frames in a photoelectric sensor sensitive spectrum are subjected to cross-association matching calculation respectively to acquire the displacement of the corresponding primary color image frame; the displacement is averaged to be used as the instant relative displacement vector of an object, so that total displacement vector and instant speed thereof are obtained, and whether the reference frame and the optimum matching comparison window thereof are updated or not is determined according to the results, and the size of a cross-association operator array performing search matching is adjusted automatically. The accuracy of the device is less than one pixel unit, and the device has a certain capacity of ambient light interference resistance, and is advanced in technology and low in cost.
Owner:CHONGQING TECH & BUSINESS UNIV

Method and device for measuring two-dimensional infinitesimal displacement with single primary color by using computer camera

InactiveCN102102982BReduce the amount of calculation and analysisFast measurementUsing optical meansAuto regulationCorrelation coefficient
The invention relates to a method and device for measuring two-dimensional infinitesimal displacement with a single primary color by using a computer camera, and further provides a method and device for contactless displacement measurement with a computer camera. The device comprises a computer and a computer camera, and is provided with a camera shooting and single-color frame matcher. In the invention, the texture of a reflective surface of an object to be measured can be analyzed by adopting a brightness self-association coefficient calculation method and the size of a comparison window is automatically regulated; one of three primary color frames is selected as an object to be measured, primary color frames selected for a former and a later frames are subjected to a cross correlation matching computation to determine that the highest frame-frame correlation degree is achieved when the cross correlation coefficient value is minimum and close to zero, thereby an instant displacement, a total displacement and an instant speed are obtained; whether to upgrade a reference frame or regulate the position of the comparison window is determined according to result on the instant displacement, the total displacement and the instant speed, the size of a cross association operator array which is used for search matching is regulated automatically; therefore, the method and the device are favorable for overcoming the impacts of other wavelengths and changes to the measurement, and further improving the measurement speed.
Owner:CHONGQING TECH & BUSINESS UNIV
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