Patents
Literature
Hiro is an intelligent assistant for R&D personnel, combined with Patent DNA, to facilitate innovative research.
Hiro

43results about How to "Reduce time synchronization requirements" patented technology

Method of synchronizing a turbomachine generator to an electric grid

An embodiment of the present invention may seek to match the generator and grid voltages before the powerplant machine reaches the grid matching speed during the start-up process. An embodiment of the present invention may provide a predictive algorithm, or the like, to control the acceleration rate of the powerplant machine to target a particular phase angle differential between the powerplant machine and the grid when the powerplant machine reaches the grid matching speed. Here, the phase angle difference may be targeted such that a generator breaker may be closed immediately after the powerplant machine accelerates beyond the grid matching speed. This may avoid the generator experiencing a phase angle differential, which may add to the power transient associated with the generator breaker closure.
Owner:GENERAL ELECTRIC CO

Method and system for transmitting data based on Orthogonal Frequency Division Multiplexing (OFDM)

The invention discloses a method for transmitting data based on Orthogonal Frequency Division Multiplexing (OFDM), which is applied to transmission of uplink data of middle-distance and short-distance wireless communication systems and is characterized in that: available frequency band of the system is equally divided into N basic sub-frequency bands in advance, wherein the method comprises the following steps: a transmitting site transmits data to a receiving site by a single sub-frequency band or M combined sub-frequency bands, wherein M is equal to 2*n; the transmitting site employs a sampling rate of fs or M*fs of a baseband sample; the receiving site receives data sent from one or a plurality of transmitting sites in the available frequency band; and the receiving site employs a sampling rate of N*fs of the baseband sample. The invention further provides a system for transmitting data based on the OFDM. The method and the system are based on the OFDM technology and combined use of the sub-frequency bands; according to the method and the system, the transmitting site and the receiving site in the wireless communication system are permitted to have different bandwidth configurations, the transmitting site can utilize lower configuration while the receiving site can utilize higher configuration, thereby improving the efficiency, the spectrum efficiency, the throughput rate, etc.; in addition, a plurality of user sites communicating with an access point simultaneously can be realized.
Owner:BEIJING NUFRONT MOBILE MULTIMEDIA TECH

OFDM (Orthogonal Frequency Division Multiplexing)-based data transmission method, transmitting sites and receiving site

The invention provides an OFDM (Orthogonal Frequency Division Multiplexing)-based data transmission method for enabling J transmitting sites to transmit data to one receiving site at the same time. J is a positive integer. The method comprises steps: the receiving site divides an available frequency band into N basic sub frequency bands, independently-occupied Mj basic sub frequency bands are scheduled for each of the J transmitting sites, j is a positive integer between 1 and J, and the sum of M1+M2+...+MJ is no more than N; the cyclic prefix length TCP of the system is set to be no less than 2delta+ taum, wherein the 2delta is two-way propagation delay when a signal arrives at the maximum allowable coverage radius from the transmitting sites, and the taum is multipath delay spread; each of the J transmitting sites adds a cyclic prefix with a length of TCP to each to-be-transmitted data, and the data are then modulated to the independently-occupied Mj basic sub frequency bands and then transmitted; and the receiving site receives the data transmitted by the J transmitting sites at the same time in the N basic sub frequency band range, and data transmitted by each transmitting site are extracted according to the cyclic prefix with a preset length of TCP. The method of the invention allows unequal bandwidth capacity communication, and allows multi-user simultaneous access.
Owner:GUANGDONG NUFRONT COMP SYST CHIP

Data transmission method, sending site and receiving site based on OFDM (orthogonal frequency division multiple access)

The invention provides a data transmission method based on OFDM for transmitting data from J sending sites to one receiving site at the same time; J is positive integer; the method comprises that: the receiving site divides usable frequency band into N basic sub frequency bands, the J sending sites dispatch respectively exclusive Mj basic sub frequency bands, j is an element of a set [1, J] and is a positive integer, and the formula indicating the relationship between Mj and N is as shown in the specification; the J sending sites respectively carry out IFFT (inverse fast fourier transform) treatment to respectively transmitted OFDM data, the Jth sending site carries out IFFT treatment with length of MjxK point to the data, the sampling rate is Mjxfs; the J sending sites respectively modulate the IFFT treated data, the jth sending site modulates the data to Mj basic sub frequency bands; the J sending sites sends the data on respectively exclusive Mj basic sub frequency bands; the receiving site receives the data sent by the J sending sites within the range of the N basic sub frequency bands at the same time, carries out FFT (fast fourier transform) treatment of NxK point, the sampling rate is Nxfs. The method allows bandwidth non-equivalence communication and allows simultaneous access of a plurality of users.
Owner:BEIJING NUFRONT MOBILE MULTIMEDIA TECH

Authentication method and device and storage medium

The embodiment of the invention discloses an authentication method and device and a storage medium. The method comprises the steps that a terminal sends a first authentication request message carryinga token to a server; the server sends the first authentication response message to the terminal; the terminal sends a second authentication request message carrying a sequence ciphertext and a targetdynamic password to the server, the target dynamic password is encrypted from local registration parameters, an original key and sequence data of the terminal, and the sequence ciphertext encrypts the self-sequence data; and the server sends a second authentication response message carrying an authentication result to the terminal, wherein the authentication result is used for indicating that thetarget dynamic password is authenticated according to the sequence ciphertext, the local original key of the server and the registration parameter. The symmetric key function and the HMAC technologycan be used between the server and the terminal for registration and authentication, the calculation speed can be increased, the expenditure of time and space is reduced, the requirement of sequence data for time synchronization is low, and the method is suitable for authentication of transnational and cross-regional terminals and servers.
Owner:BIGO TECH PTE LTD

A system and method for implementing collision resolution scheduling in satellite optical burst switch

A system and method for implementing collision resolution scheduling of satellite optical burst switch. According to the topology of space-based broadband transmission backbone network and the statusof each switching node, through the scheduling method of network resources pre-allocation, at that boundary of the space-based broadband transmission backbone network, the data to be transmitted and exchanged to the space-based broadband transmission backbone network is controlled, the switching time and the forwarding path of each optical burst data entering into the space-based broadband transmission backbone network are planned in advance, and the collision resolution scheduling of the optical burst data exchange of the space-based broadband transmission backbone network is realized. The optical burst data of the space-based broadband transmission backbone network is generated by the electric domain. After completing the electro-optical conversion at the edge node of the backbone network, the optical burst data enters the backbone network for optical burst exchange. After reaching the destination edge node, the optical burst data is converted, and then the data is sent to the processing terminal to complete the data routing exchange process. Through pre-planning and scheduling, the system can resolve the collision of satellite optical burst switch by using network resources.
Owner:XIAN INSTITUE OF SPACE RADIO TECH

Positioning method based on channel pulse response autocorrelation sequence

The invention, which belongs to the indoor positioning technology, disclosed a method for positioning a non-cooperative target by using channel pulse response autocorrelation sequence. The method comprises the following steps: establishing a location database; arranging positioning chips on each management object and storing each management object information parameter in the database; determining the positions of the management objects and displaying the current positions of all the management objects on a visual interface. In the invention, the channel pulse response autocorrelation sequence is used as a signal for establishing the database. After a receiver receives the signal, autocorrelation processing is performed respectively. And the processed signal and preset node position parameters which are relative to each signal receiver are used to establish the positioning database. In the method, more discrete time domain information is used, positioning information is abundant and positioning accuracy can be further raised. Compared to the background technology, the positioning accuracy by using the method of the invention can be raised more than 10%. Sensitivity to position differences in positioning areas and the positioning accuracy can be effectively raised. Requirements, such as time synchronism and the like, can be reduced.
Owner:UNIV OF ELECTRONIC SCI & TECH OF CHINA

Mobile equipment position estimation method based on multi-base-station channel state information fusion

The invention discloses a mobile equipment position estimation method based on multi-base-station channel state information fusion, and belongs to the technical field of radio mobile positioning. The method comprises the following steps: enabling a base station to collect a non-real-time channel state information sample from mobile equipment; extracting angular domain power spectrum channel characteristics; calculating the difference degree between the samples according to the angular domain power spectrum channel characteristics to obtain a single base station sample difference degree matrix; enabling a data fusion node to fuse the plurality of single base station sample difference degree matrixes to obtain a global sample difference degree matrix; enabling the data fusion node to create a channel map for the sample data set according to the global sample difference degree matrix, and calibrate the channel map; and enabling the base station to collect real-time channel state information from the mobile equipment, and performs matching positioning by combining the sample data set and the channel map to obtain real-time position information of the mobile equipment. Accurate time synchronization between the base stations is not needed, field survey is not needed, the manual participation degree is reduced, and automatic operation of the mobile positioning system is achieved.
Owner:NAT UNIV OF DEFENSE TECH

Cable insulation monitoring method and system based on high-voltage power frequency and low-voltage ultralow frequency

The invention discloses a cable insulation monitoring method and system based on high-voltage power frequency and low-voltage ultralow frequency, and belongs to the field of cable insulation monitoring. The method comprises the steps: coupling a low-voltage ultralow frequency signal in a high-voltage power frequency cable line; respectively measuring zero-sequence ultralow-frequency active and reactive power average values at the head and tail ends of each line; calculating the average value and the standard deviation of the ultralow-frequency dielectric loss of each line; judging whether theaverage value and the standard deviation of the ultralow-frequency dielectric loss exceed set thresholds or not; calculating correlation coefficients between adjacent lines, and comparing the correlation coefficients with the average correlation coefficient; calculating the change rate of the ultralow-frequency dielectric loss average value of each line, carrying out normalization processing to construct a distribution function, solving the insulation degradation probability, and outputting the insulation degradation probability when the insulation degradation probability is greater than the basic proportion. According to the invention, on the premise of realizing cable insulation online monitoring, various data processing methods are utilized to formulate an evaluation basis for a specific line, and the cable insulation state is evaluated timely and accurately.
Owner:HUAZHONG UNIV OF SCI & TECH

A data transmission method and transmitting site based on OFDM

The invention discloses a data transmission method based on OFDM, which is used for uplink data transmission in a short-to-middle-distance wireless communication system. The available frequency band of the system is divided into N basic frequency sub-bands in advance. The method includes: the transmitting site occupies M basic frequency sub-bands Frequency band, modulate the data to the M basic sub-bands and send it out; the receiving station receives the data sent from one or more transmitting sites within the N basic sub-bands; M≤N, M and N are both positive integer. The invention also provides an OFDM-based data transmission system. The present invention is based on the combination of OFDM technology and sub-frequency bands, allowing the transmitting site and receiving site in the wireless communication system to have different bandwidth configurations, the transmitting site can use a lower configuration to reduce hardware costs, and the receiving site can use a higher configuration to improve bandwidth. Efficiency: Spectrum utilization, throughput, etc., and enables multiple user sites to communicate with access points at the same time.
Owner:BEIJING NUFRONT MOBILE MULTIMEDIA TECH

Authentication method and device and storage medium

The embodiment of the invention discloses an authentication method and device and a storage medium. The method comprises the steps that a terminal sends a first authentication request message carryinga token to a server; the server sends the first authentication response message to the terminal; the terminal sends a second authentication request message carrying the target dynamic password to theserver, wherein the target dynamic password is encrypted from a local registration parameter, an original key and a time window parameter of the terminal; and the server sends a second authenticationresponse message carrying an authentication result to the terminal, the authentication result being used for indicating that the target dynamic password is authenticated according to the registrationparameter, the original key and the time window parameter in the time window indicated by the time window parameter. A symmetric key function and an HMAC technology can be used between the server andthe terminal for registration and authentication, the calculation speed can be increased, the overhead of time and space can be reduced, the range of a time window is wide, the requirement for time synchronization is low, and the method is suitable for authentication of transnational and cross-regional terminals and servers.
Owner:BIGO TECH PTE LTD

Energy-saving heating system with tracking and measuring functions and method

The invention discloses an energy-saving heating system with tracking and measuring functions and a method. The system comprises a locating device, a temperature measuring device, a coordinative control system and heating devices. The locating device is used for locating the human body and sending locating information to the coordinative control system. The temperature measuring device measures the environment temperature around the human body and transfers the temperature information to the coordinative control system. The coordinative control system receives the position information and thetemperature information of people. The coordinative control system controls one or more heating devices needing to work to move to the designated position according to the position information of people. The temperature measuring device measures the environment temperature around people in real time, and sends the temperature information to the coordinative control system. The coordinative controlsystem adjusts working power of the heating devices according to the current temperature. According to the system, staff in the area can be located, the environment temperature around people can be measured, the heating devices are moved to the place near the staff and directly heat the area around people, and the automatic tracking and heating functions are achieved.
Owner:ZHEJIANG GONGSHANG UNIVERSITY

Automatic final heating device and method oriented to stable heating route

The invention discloses an automatic final heating device and method oriented to a stable heating route. A positioning device, a temperature measuring device, a coordinated control system and heatingdevices are included; the positioning device is used for positioning the human body and transmitting the positioning information to the coordinated control system; the temperature measuring device measures the ambient temperature of the human body and transmits temperature information to the coordinated control system; the coordinated control system receives position information of a person and the temperature information, and the coordinated control system controls the one or several heating devices needing to work to move to the specific positions according to the position information of theperson; and the temperature measuring device measures the ambient temperature of the person in real time and sends the temperature information to the coordinated control system, and the coordinated control system adjusts the working power of the heating devices according to the current temperature. The automatic final heating device and method can locate the person in an area and measure the ambient environment of the person, the heating devices are moved to the position ear the person and directly heat areas around the person, and the functions of automatic tracking and heating are achieved.
Owner:ZHEJIANG UNIV OF TECH

Positioning method based on channel pulse response autocorrelation sequence

The invention, which belongs to the indoor positioning technology, disclosed a method for positioning a non-cooperative target by using channel pulse response autocorrelation sequence. The method comprises the following steps: establishing a location database; arranging positioning chips on each management object and storing each management object information parameter in the database; determining the positions of the management objects and displaying the current positions of all the management objects on a visual interface. In the invention, the channel pulse response autocorrelation sequence is used as a signal for establishing the database. After a receiver receives the signal, autocorrelation processing is performed respectively. And the processed signal and preset node position parameters which are relative to each signal receiver are used to establish the positioning database. In the method, more discrete time domain information is used, positioning information is abundant and positioning accuracy can be further raised. Compared to the background technology, the positioning accuracy by using the method of the invention can be raised more than 10%. Sensitivity to position differences in positioning areas and the positioning accuracy can be effectively raised. Requirements, such as time synchronism and the like, can be reduced.
Owner:UNIV OF ELECTRONICS SCI & TECH OF CHINA

Data transmission device and data reception device

As shown in FIG. 7, a data receiver receives video data and audio data together with a frequency division parameter N that depends on the pixel clock of the video data and the sampling frequency of the audio data, and a count value CTS that is obtained by counting the period of the audio clock that has been subjected to frequency division by the frequency division parameter N, with the pixel clock, which are transmitted from a data transmitter, and subjects the pixel clock to frequency division by the count value CTS, phase-control the divided clock (s501) in accordance with a phase comparison clock (s505) that is obtained by dividing an audio clock (s403) oscillated from a VCO (504) by the frequency division parameter N, thereby generating an audio clock (s403).Accordingly, the data transmitter and the data receiver can satisfactorily implement multiplexing of audio data and video data, and transmission of the multiplexed data using an existing DVI cable, with a simple structure.
Owner:PANASONIC CORP

Urban monocular mapping method and system based on GPS constraint and dynamic correction

The invention relates to an urban monocular mapping method and system based on GPS constraint and dynamic correction, and the method comprises the steps: screening a curved road section according to the trajectory curvature of a vehicle during driving, and detecting the internal and external parameters of a monocular camera according to the sequence image of the screened curved road section in the monocular camera; determining pose absolute coordinate transformation of the monocular camera according to whether the change of the internal reference or the external reference of the monocular camera is greater than a threshold value or not; and outputting a map according to the pose absolute coordinate transformation and the multi-view intersection measurement of the monocular camera. According to the invention, the monocular camera and the consumer-level GPS equipment are fused for single-vehicle mapping, so that the dependence on a laboratory calibration environment is reduced, and the mapping reliability is improved.
Owner:WUHAN ZHONGHAITING DATA TECH CO LTD

An audio localization method based on emission angle estimation

The invention belongs to the technical field of indoor positioning, and discloses an audio positioning method based on emission angle estimation. At least two base stations with known position information and attitude information are arranged, and each base station is equipped with an array of sound source emitters. The array includes several sound source transmitters that transmit sound signals in different directions; each base station continuously transmits sound signals with identification codes through the sound source transmitters, and the identification codes of the sound signals emitted by different sound source transmitters are uniquely determined and Different from each other; the receiving end receives all sound signals from all base stations, and demodulates the sound signals to obtain the angular probability distribution between the receiving end and the base station; according to the angular probability distribution, the best spatial estimation corresponding to the receiving end and each base station is obtained Angle: According to the best spatial estimation angle in the base station coordinate system, the position information and attitude information of the base station, the spatial position of the receiving end is obtained. The invention solves the problem of low accuracy of indoor positioning.
Owner:WUHAN UNIV

An authentication method, device and storage medium

The embodiment of the present invention discloses an authentication method, device and storage medium. The method includes the terminal sending the first authentication request message carrying the token to the server; the server sending the first authentication response message to the terminal; Text, the second authentication request message of the target dynamic password is sent to the server, the target dynamic password is encrypted from the local registration parameters, original key and sequence data of the terminal, and the sequence ciphertext is encrypted from the sequence data; the server will carry the second authentication result of the authentication result The response message is sent to the terminal, and the authentication result is used to indicate that the target dynamic password is authenticated according to the serial ciphertext, the server's local original key and registration parameters. Symmetric key function and HMAC technology can be used for registration and authentication between the server and the terminal, which can increase the calculation speed and reduce the time and space overhead. The sequence data has low requirements for time synchronization, and is suitable for cross-border and cross-regional terminals and Authentication of the server.
Owner:BIGO TECH PTE LTD

Temperature control system and method using competitive learning

The invention discloses a temperature control system and method using competitive learning. The temperature control system comprises a positioning device, a temperature measuring device, a coordination control system and heating devices. The positioning device is used for positioning the human body and sending positioning information to the coordination control system. The temperature measuring device is used for measuring the environment temperature around the human body and transmitting temperature information to the coordination control system. The coordination control system is used for receiving the position information of the human and the temperature information and controlling the one or more heating devices needing to work to move to appointed positions according to the position information of the human. The temperature measuring device is used for measuring the environment temperature around the human in real time and sending the temperature information to the coordination control system, and the coordination control system is used for adjusting the working power of the heating devices according to the current temperature. According to the temperature control system and method using competitive learning, the human in an area can be positioned, the environment temperature around the human is measured, the heating devices are moved to be nearby the human so as to directly heat the area around the human, and an automatic tracking and heating function is achieved.
Owner:ZHEJIANG UNIV OF TECH

Automatic tracking heating system and method with precise positioning device

The invention discloses an automatic tracking heating system and method with a precise positioning device, including a positioning device, a temperature measuring device, a coordination control system and a heating device. The positioning device is used for positioning a human body and sending positioning information to the coordination control system system; the temperature measurement device measures the temperature of the surrounding environment of the human body, and transmits the temperature information to the coordinated control system; the coordinated control system receives the position information and temperature information of the person, and the coordinated control system controls one or several heating devices that need to work according to the position information of the person. The device moves to the designated position; the temperature measuring device measures the temperature of the surrounding environment in real time, and sends the temperature information to the coordination control system, and the coordination control system adjusts the working power of the heating device according to the current temperature; the invention can locate and measure the people in the area The temperature of the surrounding environment, the heating device moves to the vicinity of the person, directly heats the area around the person, and realizes the function of automatic tracking heating.
Owner:ZHEJIANG UNIV OF TECH

Automatic tracking and heating system and method adopting precise positioning device

The invention discloses an automatic tracking and heating system and method adopting a precise positioning device. The automatic tracking and heating system comprises the positioning device, a temperature measuring device, a coordination control system and heating devices. The positioning device is used for positioning the human body and sending positioning information to the coordination controlsystem. The temperature measuring device is used for measuring the environment temperature around the human body and transmitting temperature information to the coordination control system. The coordination control system is used for receiving the position information of the human and the temperature information and controlling the one or more heating devices needing to work to move to appointed positions according to the position information of the human. The temperature measuring device is used for measuring the environment temperature around the human in real time and sending the temperature information to the coordination control system, and the coordination control system is used for adjusting the working power of the heating devices according to the current temperature. According tothe automatic tracking and heating system and method adopting the precise positioning device, the human in an area can be positioned, the environment temperature around the human is measured, the heating devices are moved to be nearby the human so as to directly heat the area around the human, and an automatic tracking and heating function is achieved.
Owner:ZHEJIANG UNIV OF TECH

Cable insulation monitoring method and system based on high-voltage power frequency and low-voltage ultra-low frequency

The invention discloses a cable insulation monitoring method and system based on high-voltage power frequency and low-voltage ultralow frequency, and belongs to the field of cable insulation monitoring. The method comprises the steps: coupling a low-voltage ultralow frequency signal in a high-voltage power frequency cable line; respectively measuring zero-sequence ultralow-frequency active and reactive power average values at the head and tail ends of each line; calculating the average value and the standard deviation of the ultralow-frequency dielectric loss of each line; judging whether theaverage value and the standard deviation of the ultralow-frequency dielectric loss exceed set thresholds or not; calculating correlation coefficients between adjacent lines, and comparing the correlation coefficients with the average correlation coefficient; calculating the change rate of the ultralow-frequency dielectric loss average value of each line, carrying out normalization processing to construct a distribution function, solving the insulation degradation probability, and outputting the insulation degradation probability when the insulation degradation probability is greater than the basic proportion. According to the invention, on the premise of realizing cable insulation online monitoring, various data processing methods are utilized to formulate an evaluation basis for a specific line, and the cable insulation state is evaluated timely and accurately.
Owner:HUAZHONG UNIV OF SCI & TECH

A system and method for realizing satellite optical burst switching conflict resolution scheduling

The present invention relates to a satellite optical burst switching conflict resolution scheduling implementation system and method, according to the network topology of the space-based broadband transmission backbone network and the status of each switching node, through the scheduling mode of pre-allocation of network resources, in the space-based broadband transmission backbone network The boundary controls the data that will enter the space-based broadband transmission backbone network for transmission and exchange, pre-plans the exchange time and forwarding path of each optical burst data entering the space-based broadband transmission backbone network, and realizes the optical burst data exchange of the space-based broadband transmission backbone network conflict resolution scheduling. The optical burst data of the space-based broadband transmission backbone network is generated by the electrical domain. After the electrical-optical conversion is completed at the edge node of the backbone network, it enters the backbone network for optical burst exchange. After reaching the destination edge node, the optical-electrical conversion is completed, and then the data is sent to the processing terminal. , to complete the data routing exchange process. The system utilizes network resources to resolve conflicts in satellite optical burst switching through pre-planning and scheduling.
Owner:XIAN INSTITUE OF SPACE RADIO TECH
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products