30results about How to "High real-time transmission" patented technology

The invention relates to a wireless network multichannel combination communication method. The method includes that S1, networking is performed on concentrators by a master station, and adjacent concentrators use different communication channels; S2, networking is performed on collectors by the concentrators, and adjacent collectors use different communication channels; S3, networking is performed on a terminal device by the collectors, the collectors use basic channels to send networking instructions in a broadcast mode to the terminal device, the terminal device receives the commutation channels of the collectors after networking succeeds, and the collectors and the terminal device are communicated with each other. The wireless network multichannel combination communication method has the advantages that multiple basic channels and wide basic channels are used for spacing, so that same frequency interference is avoided, mistaken awakening to the terminal device is prevented, power consumption of the terminal device is reduced and service life of the terminal device is prolonged; the adjacent collectors use the different communication channels, so that competition on the same channel during automatic data sending of the terminal device is lowered, real-time performance of network transmission is improved, system concurrent processing ability and system throughput are improved.

The invention discloses a large-scale parallel real-time transmission method and system for a Beidou satellite navigation signal. Large-scale parallel signal transmission branches are built; large-scale grouping is carried out on satellite navigation messages in sequence; the grouped satellite navigation messages are sent to the parallel signal transmission branches successively; a complex shifting pseudo-random code generator is used for obtaining special navigation satellite parallel transmission branch sub ranging code; spectrum spreading is carried out on navigation messages of all branches respectively; modulation is carried out by same carrier waves with different frequency shifts; carrier wave modulation navigation signals of all branches are superposed and noises are added to form a composite satellite navigation signal; the composite satellite navigation signal is emitted by a single antenna; a receiving terminal carries out carrier removing, dispreading, and demodulation on the received navigation signal in a single antenna receiving manner according to branches and thus the navigation message are transformed from a parallel mode into a serial mode; and a navigation message is obtained to realize real-time navigation and positioning of a Beidou satellite navigation system. The large-scale parallel real-time transmission method and system can be applied to a satellite navigation system widely as well as various ranging systems, communication systems, radio and television systems and control systems.

The invention discloses a big data packet transmission method and a big data packet transmission device based on a real-time data distribution service. The method comprises the following steps: constructing a small data packet publishing and subscribing library, and initializing the small data packet publishing and subscribing library; the publisher publishes a big data packet theme, and the subscriber subscribes the big data packet theme; when the data is sent, dividing the big data packet into a plurality of small data packets, filling related data information into the small data packets, storing the small data packets into a sending queue, and sending the data sub-packets through an asynchronous sending thread; when the subscriber receives the first data sub-packet, creating a cache region corresponding to the size of the big data packet, and copying the received data sub-packet to the corresponding region according to the number; the subscriber verifies the integrity of the data and feeds back the integrity to the publisher when receiving the last data packet; and if the publisher receives the packet loss feedback information, resending the lost data sub-packets until all subscribers receive all the data sub-packets. The invention provides a data sub-package retransmission mechanism with convergence. The occupied system memory is small. The transmission real-time performance is high, and a simple and easy-to-use interface is also exported.

The invention relates to the technical field of optical fiber network communication, and provides a center node device based on a gigabit passive optical network. The device comprises a power module, a center node MAC layer module, a center node high-speed physical layer module and a photoelectric conversion module, wherein the power module is respectively connected with the center node MAC layer module, the center node high-speed physical layer module and the photoelectric conversion module electrically and provides electric energy for the center node MAC layer module, the center node high-speed physical layer module and the photoelectric conversion module, the center node high-speed physical layer module is in communication connection with the center node MAC layer module, and the photoelectric conversion module is in communication connection with the center node high-speed physical layer module and is connected with access nodes through optical fibers. The device has the advantages that a gigabit Ethernet is good in compatibility, optical network bandwidth is large, and outside electromagnetic environment interference is avoided.

The invention discloses a Beidou satellite navigation signal large-scale parallel real-time transmission realization method and system. According to the method and system, large-scale parallel signaltransmission branches are constructed; satellite navigation messages are massively divided into different groups according to structures; the grouped satellite navigation messages are sent to the parallel signal transmission branches successively; a complex shifting pseudo-random code generator is used for obtaining special sub ranging codes for the navigation satellite parallel transmission branches; spectrum spreading is carried out on navigation messages of all the branches respectively; modulation is carried out by same carrier waves with different frequency shifts; the carrier wave modulated navigation signals of all the branches are superposed, and noises are added to the superposed navigation signals, and therefore, composite satellite navigation signals can be formed; the compositesatellite navigation signals are emitted by a single antenna; a receiving terminal carries out carrier removing, dispreading, and demodulation on the received navigation signals in a single antenna receiving manner according to the branches, and thus the navigation messages are transformed from a parallel mode into a serial mode; and the navigation messages are obtained to realize real-time navigation and positioning of a Beidou satellite navigation system. The large-scale parallel real-time transmission method and system can be applied to a satellite navigation system widely as well as various ranging systems, communication systems, radio and television systems and control systems.

The embodiment of the invention discloses a network flow control method and device. The method applied to a client comprises the following steps: receiving data packets which are sent by different data packet supply nodes and are specific to the same target stream, wherein each data packet carries a data packet lagrange multiplier which is specific to the target stream, to which the data packet belongs, and corresponds to the data packet supply node which sends the data packet; extracting the data packet lagrange multipliers from the received data packets; according to all the extracted data packet lagrange multipliers, calculating a first sending rate of each data packet supply node for the data packet of the target stream to which the data packet belongs; for each data packet supply node, according to the first sending rate corresponding to the data packet supply node, calculating a second sending rate for sending an interest packet to the data packet supply node; and sending the interest packet to each data packet supply node at the second sending rate, so as to control the network flow. By the implementation of the network flow control method, the network resource utilization rate in an NDN (Named Data Networking) is increased.

The invention discloses a high-voltage pulse generator and a communication method thereof. The high-voltage pulse generator comprises a main controller and sub-controllers, wherein data transmitted between the main controller and the sub-controllers at least comprise a first type of data and a second type of data; and the second type of data comprises at least two kinds. The communication method comprises the following steps: when the first type data is transmitted at present, transmitting a part of the second type of data; when transmitting the first type of data next time, transmitting the other part of the second type of data; and repeating the previous steps till the transmission of the second type of data is finished. Through adoption of the high-voltage pulse generator, high transmission real-time performance of the first type of data is ensured. Moreover, less controller pin resources are occupied; the cost is relatively low; and the problem of data conflict is solved.

The invention discloses a method for real-time full duplex reliable communication between an MCU and multiple FPGAs by using SPIs, and aims to solve the problems that in the prior art, the characteristics of SPI full duplex and a bus are not fully utilized, uncertain-length data cannot be reliably transmitted in real time, and the communication speed of the MCU and the FPGAs is not effectively increased. According to the invention, the MCU terminal is used as a host to continuously and cyclically send the sub-data to the plurality of FPGA terminals through the SPI, and the plurality of FPGA terminals are used as slaves to continuously and cyclically send the sub-data to the MCU terminal through the SPI after receiving the enable signal of the host. After receiving the sub-data, the two parties judge data properties according to the first byte, directly discard the sub-data if the sub-data are invalid, and resend the sub-data if there is a resending application, it is judged whether thecheck bit is correct or not if the sub-data are valid, resending is applied for if the check bit is incorrect, the frame data length is calculated according to the second to third bytes if the checkbit is correct, and complete frame data is formed.

The invention relates to a networking type data acquisition and analysis system and method, and the system comprises an upper computer and networking type data acquisition equipment, wherein the uppercomputer is connected with the networking type data acquisition equipment through a network cable; upper computer analysis software is arranged in the upper computer; the analysis software is responsible for parameter setting and network adapter setting of the system, using a multithreading technology for data processing, receiving, storing, analyzing and displaying of a large amount of data, andconducting on-line and off-line analysis on the data. A multi-channel synchronous isolation acquisition mode is adopted, high-precision and high-sampling-rate data acquisition of multiple groups of analog quantities and multiple groups of digital quantities is supported, the anti-interference capability is high, and data acquisition parameters are flexibly configured.

The embodiment of the invention discloses a network flow control method and device. The method applied to a client comprises the following steps: receiving data packets which are sent by different data packet supply nodes and are specific to the same target stream, wherein each data packet carries a data packet lagrange multiplier which is specific to the target stream, to which the data packet belongs, and corresponds to the data packet supply node which sends the data packet; extracting the data packet lagrange multipliers from the received data packets; according to all the extracted data packet lagrange multipliers, calculating a first sending rate of each data packet supply node for the data packet of the target stream to which the data packet belongs; for each data packet supply node, according to the first sending rate corresponding to the data packet supply node, calculating a second sending rate for sending an interest packet to the data packet supply node; and sending the interest packet to each data packet supply node at the second sending rate, so as to control the network flow. By the implementation of the network flow control method, the network resource utilization rate in an NDN (Named Data Networking) is increased.

The invention relates to a wireless network multichannel combination communication method. The method includes that S1, networking is performed on concentrators by a master station, and adjacent concentrators use different communication channels; S2, networking is performed on collectors by the concentrators, and adjacent collectors use different communication channels; S3, networking is performed on a terminal device by the collectors, the collectors use basic channels to send networking instructions in a broadcast mode to the terminal device, the terminal device receives the commutation channels of the collectors after networking succeeds, and the collectors and the terminal device are communicated with each other. The wireless network multichannel combination communication method has the advantages that multiple basic channels and wide basic channels are used for spacing, so that same frequency interference is avoided, mistaken awakening to the terminal device is prevented, power consumption of the terminal device is reduced and service life of the terminal device is prolonged; the adjacent collectors use the different communication channels, so that competition on the same channel during automatic data sending of the terminal device is lowered, real-time performance of network transmission is improved, system concurrent processing ability and system throughput are improved.

The invention relates to a frequency selection method, device, computer equipment and storage medium based on short-wave communication. The method includes: determining a communication frequency band corresponding to the communication parameter according to the communication parameter; the communication parameter includes a communication distance parameter and a communication time parameter; Frequency band, determine the initial call frequency; control the master station to send empty data packets to the slave station according to the initial call frequency; determine the communication frequency between the master station and the slave station according to the response message sent by the slave station. The method improves the transmission real-time performance of determining the communication frequency, and improves the efficiency of determining the communication frequency between the master station and the slave station.

The invention relates to a system for the transmission and display of at least two video signals, said system comprising: an encoder, a decoding and display unit, and a screen, the encoder receiving the input of the video signal, and the screen receiving the input of the decoding and display unit; The encoder performs clearing processing on the covered area of ​​the current frame of the received video signal according to the information corresponding to the covered area of ​​the video window of the video signal on the screen, and then encodes the current frame after the clearing process; the encoder The coded content is also packaged into a video stream, and the video stream is sent to the decoding and display components through the network. The invention can eliminate or reduce the memory space required for coding in the covered area of ​​the video window, reduce the bandwidth of the transmission process, eliminate redundant data, and improve the real-time performance of transmission.

The invention discloses an implementation method of a network audio selection source based on FFmpeg, which comprises the following steps of: registering various audio and video codecs, multiplexers and filters, simultaneously opening a plurality of paths of network audio sources, selecting a proper audio encoder according to a novel audio, extracting a single sound channel, and carrying out confluence playing by using a proper audio filter. The multi-channel network audio selection output scheme based on ffmpeg is realized, the multi-channel audio transmitted from the network can be combinedand output, the transmission real-time performance is very high, and the multi-channel audio collection output requirement in practical application can be met.

The invention belongs to the technical field of cloud data center network transmission flow scheduling, discloses a short-flow real-time optimization method, system, and network transmission terminal, and constructs a reinforcement learning framework for a data center short-flow real-time optimization method; data center network flow feature acquisition , used to monitor traffic characteristics in the data center and generate traffic size distribution; multi-level queue demotion threshold initialization, calculate the multi-level queue demotion threshold according to the data center internal traffic size distribution characteristics; threshold dynamic adjustment, used for fine-grained dynamic adjustment threshold size In order to adapt to the change of data center traffic size, realize the priority transmission of data packets. The invention realizes adaptive matching of traffic size and transmission based on the reinforcement learning threshold, reduces the transmission delay of interactive real-time short traffic, improves the delayed transmission of long traffic with high bandwidth requirements in the queue, and improves the real-time performance of network transmission.

The present invention discloses a pulse power supply real-time control system based on a reflective memory network and a DSP controller, comprising a reflective memory network, wherein the reflective memory network comprises a reflective memory switch and more than one node unit connected with the reflective memory switch; at least one node unit comprises a DSP controller, the DSP controller is used for acquiring various state signals of a pulse power supply in a current transformer apparatus, and is connected with a current transformer main circuit, the DSP controller achieves control and protection functions with the reflective memory switch through a reflective memory card. The pulse power supply real-time control system of the present invention has the advantages of capacity of improving transmission real-time performance, transmission delay determinacy and reliability of data and commands in the control system, etc.

The present invention relates to a networkable data acquisition and analysis system and method, the system includes a host computer and a networkable data acquisition device, the host computer and the networkable data acquisition equipment are connected through a network cable; Computer analysis software, which is responsible for system parameter setting and network card setting, and uses multi-thread technology for data processing to realize the reception, storage, analysis and display of large amounts of data, and can conduct online and offline analysis of data. The invention adopts a multi-channel synchronous isolation acquisition mode, supports multi-group analog quantities and multi-group digital quantities with high precision and high sampling rate data acquisition, has strong anti-interference ability, and the data acquisition parameters can be flexibly configured.