560 results about "Frame synchronization" patented technology

The invention relates to the technical field of power line communication, and discloses a frame synchronization method and device for broadband power line communication, and the method comprises the steps: carrying out the symbolization cross-correlation operation of a received signal, and obtaining a cross-correlation result sequence; performing secondary autocorrelation analysis and accumulation processing on the cross-correlation values in the sequence to generate an autocorrelation accumulated value sequence; screening candidate peak positions according to absolute values of the self-correlation accumulated values; defining a synchronous peak analysis window around the candidate peak position, and setting a noise reference window in an area far away from the window; verifying the validity of the candidate peak based on the difference between the autocorrelation accumulated values of the synchronization peak window and the noise reference window; and if the verification is valid, calculating and determining a final synchronization position through a mean value of a plurality of peak value positions in the synchronization peak window. According to the method, the problem of inaccurate synchronization peak positioning under the multipath effect and noise interference in the existing method is solved through the self-correlation accumulation and noise separation mechanism, and the reliability of frame synchronization is improved.

According to the grid-connected line electric energy quality on-line detection device, the system comprises a broadband sensing module which is deployed on a grid-connected line to form an original analog signal; the conditioning module forms a standardized digital sampling signal; the edge calculation module receives the standardized digital sampling signal, analyzes a voltage effective value, a harmonic distortion rate, a sag depth and an event duration index in real time through a parallel calculation architecture, and forms an electric energy quality characteristic data set; the intelligent analysis module receives the electric energy quality characteristic data set to form an abnormal event report; and the communication interaction module receives the abnormal event report, encapsulates the abnormal event report into a standardized data frame through a configurable protocol stack, synchronously pushes the standardized data frame to the local monitoring terminal and the cloud management platform, receives an external control instruction and feeds back the external control instruction to the intelligent analysis module to optimize an analysis strategy. The grid-connected line electric energy quality on-line detection device can solve the problem that complex disturbance cannot be recognized in real time and cannot be accurately traced to the source.

The invention provides an AI-based nuclear power station high-risk operation compliance real-time monitoring method and system, and the method comprises the steps: processing human body joint point coordinate data of an operator through employing an AI dynamic contour modeling algorithm, and generating a limb movement track sequence; scanning the preset operation area to generate a relative motion vector between the special operation tool for the nuclear power station and the operator; detecting an action deviation mode of the operator based on the limb movement track sequence, and generating a detection result; fusing the relative motion vector and multi-channel video stream frame synchronization data obtained by applying an AI video analysis algorithm to generate a space intrusion relation between the nuclear power station special operation tool and the nuclear power station high-risk equipment; and when the action deviation mode exists in the detection result and the space intrusion relation exceeds a preset safety threshold, generating an operation compliance signal. According to the invention, real-time dynamic evaluation of human motion compliance and tool equipment safety distance in the high-risk operation process of the nuclear power station is realized, and the safety monitoring precision and real-time early warning capability of high-risk operation are improved.

The invention relates to the technical field of intelligent monitoring, in particular to a multi-thread low-power-consumption intelligent monitoring system based on an AI processor. The method has the advantages that aiming at the problems of unbalanced computing power and power consumption, high multi-task processing delay and strong hardware dependence in the prior art, the NPU module of the RK3588 processor is combined with the INT8 quantitative model, so that the power consumption is lower than 10W under the 6TOPS computing power; a dynamic multi-thread scheduling mechanism is designed, parallel processing of more than eight paths of video streams is supported through binding of a priority queue and an NPU core, and end-to-end delay is compressed to be within 200 ms; a zero-copy video stream architecture is constructed, data transfer is eliminated through memory mapping, and preprocessing time consumption is reduced by 90%; an energy efficiency control module is integrated, the NPU voltage frequency is dynamically adjusted according to the load, and the energy efficiency ratio reaches 0.83 TOPS / W; space-time alignment of multi-model reasoning results is realized by adopting a frame ID synchronization technology, and the mismatching rate is lower than 0.1%.

The invention relates to a frame synchronization detection method, device and equipment and a medium, and the method comprises the steps: carrying out the frequency offset pre-compensation of a received satellite signal; setting N different frequency offset grades, and adopting the N different frequency offset grades to perform secondary frequency offset pre-compensation on the satellite signals subjected to frequency offset pre-compensation to obtain N satellite signals subjected to secondary frequency offset pre-compensation; performing frame synchronization detection on each satellite signal subjected to secondary frequency offset pre-compensation by adopting a frame synchronization detection algorithm to obtain N detection results; and screening out a final frame synchronization detection result by adopting a preset rule based on the N detection results. According to the method, the frame synchronization detection performance can be improved, and the detection performance can meet the system design index requirement.

The invention relates to a high-frame-rate rendering method and system based on a display driving chip, and the method comprises the following steps: carrying out the bidirectional scattering distribution processing of sorted scene data based on a preset real-time radiance algorithm, and obtaining scattering scene data; performing time domain reprojection on the scattering scene data through a preset frequency domain analysis technology to obtain time domain scene projection data; performing high-frame-rate pixel coloring rendering processing on the time domain scene projection data based on a preset programmable pipeline technology to obtain coloring rendering data; and performing frame synchronization processing on the coloring rendering data through a cache management mechanism to obtain synchronous rendering data, and inputting the synchronous rendering data into a preset display driving chip to drive a display screen to appear a target rendering picture, thereby solving the problem that a traditional method usually depends on a single rendering algorithm or a hardware acceleration scheme, and is not easy to implement. And smooth dynamic picture display cannot be realized on the premise that the image quality is not sacrificed.

A frequency offset estimation method for a satellite VDES system, characterized in that it includes the following steps: step 1, down-converting a carrier-containing signal output by an AD to move the signal to a baseband; step 2, performing CIC down-sampling processing on the down-converted signal to reduce the data rate to 4 times the symbol rate; step 3: performing frame synchronization processing on the CIC down-sampled signal to find the position of the frame header; step 4: performing coarse frequency offset estimation and compensation on the signal after the frame synchronization processing; step 5: performing Mpart fine frequency offset estimation on the signal after the coarse frequency offset compensation.

The invention discloses a multi-camera synchronization method, device and equipment and a computer readable storage medium. The method comprises the following steps: a frame synchronization signal generation unit generates a frame synchronization signal and sends the frame synchronization signal to a timestamp generation unit and N cameras, wherein N is a positive integer greater than or equal to 2; when the timestamp generation unit receives the frame synchronization signal, the timestamp at the current moment is put into an FIFO queue corresponding to each camera; when each camera receives the frame synchronization signal, executing a shooting action; and the forwarding unit reads the timestamps from the FIFO queues corresponding to the cameras when receiving image data obtained by each camera based on the shooting action, and sends the image data and the read timestamps to an image processing end. According to the method and the device, the plurality of cameras can synchronously execute the shooting action, and the image processing end at the rear end can accurately determine the synchronously exposed image data.

The invention discloses a target detection method, system and device based on video frame synchronous reading, and relates to the technical field of data extraction for target detection. The method is applied to a monitoring system, and comprises the following steps: determining a synchronous timestamp-containing video sequence according to a plurality of low-latency cache queues; timestamp difference values corresponding to any two timestamp-containing video frames in the synchronous timestamp-containing video sequence are smaller than a timestamp difference value threshold value; and inputting the synchronous timestamp-containing video sequence into the target detection model to obtain a target detection result corresponding to the center timestamp. According to the invention, the camera equipment is configured with one NTP client, one reading thread and one FFmpeg coding thread to obtain the synchronous video sequence containing the timestamp, and the target detection model is trained, so that the monitoring abnormity identification precision can be improved.

The invention belongs to the field of wireless communication, and particularly relates to wireless communication of aerospace crafts, in particular to a differential coding modulation communication method suitable for large Doppler frequency shift. The method comprises the following steps: 1, setting frame structure parameters; 2, framing is carried out according to power control, a synchronization header, a header and a data segment, and a frame structure is generated; step 3, quantizing and de-spreading the received signal to generate a to-be-synchronized data stream; 4, determining a frame synchronization position and a bit synchronization position, calculating frequency offset by using FFT (Fast Fourier Transform), and calculating channel frequency offset to carry out frequency offset compensation; 5, calculating a correlation value after compensating the data stream, and determining a coarse synchronization position of a receiving end frame; and 6, carrying out five-path parallel correlation peak calculation to obtain a data block bit synchronization position, a position ahead of two sampling points, a position lagging of two sampling points, a position lagging of one sampling point and a position ahead of one sampling point.

The invention provides a multi-antenna MIMO architecture synchronization method and device, a program product and a storage medium, and relates to the technical field of wireless communication. Receiving sampling signals through a plurality of receiving channels; performing down-sampling on each sampling signal to obtain a down-sampling signal; determining a plurality of cache regions to store each downsampling signal, and performing cross-correlation operation on each downsampling signal and a local synchronous time domain signal; when any receiving channel detects an effective peak value, determining the position of the effective peak value as a preliminary synchronization position; determining a corresponding search window range, and performing weighted stacking on the target cross-correlation results to obtain an overall correlation peak value; searching a maximum value in all the total correlation peak values, and determining a position corresponding to the maximum value as a final synchronization position; and calculating a frequency offset estimation value of each receiving channel according to each pilot signal, and carrying out weighted average on each frequency offset estimation value to obtain a final frequency offset estimation value. By adopting the method, the wireless frame synchronization precision can be improved.

The invention relates to an image acquisition method and device, equipment, a storage medium and a program product, and the method comprises the steps: obtaining the actual frame rate of each camera in a multi-view camera, obtaining a frame synchronization signal according to the actual frame rate of each camera and a preset target demand frame rate, and then transmitting the frame synchronization signal to each camera, and indicating each camera to output a collected image according to the frame synchronization signal. By adopting the method, the frame synchronization effect of the acquired images output by the cameras can be improved.

The invention discloses a millimeter wave radar transmitting method, a receiving method and a transceiving system based on equivalent sampling, and the transmitting method comprises the steps: generating a single-frame synchronization signal, a multi-frame synchronization signal and a long-frame selection signal according to a system frequency modulation period, a digital-to-analog conversion rate and an equivalent sampling ratio; generating a baseband modulation signal and a delay line selection signal according to the single-frame synchronization signal and the multi-frame synchronization signal; generating an analog voltage control signal according to the baseband modulation signal, and performing delay adjustment on the analog voltage control signal by using a delay line selection signal to generate a delay voltage control signal; regulating and controlling the relative delay of each frame of transmitting signal and the local oscillation signal according to the delay voltage control signal, and generating a target transmitting signal and a frequency multiplication local oscillation signal; according to the invention, the conversion rate requirement of the analog-to-digital converter in the millimeter wave radar is greatly reduced, the maximum detection distance threshold is improved, and the cost and the power consumption are effectively saved.

The application discloses a frame synchronization-based laser communication and ranging integrated system, and belongs to the technical field of satellite laser communication.The system solves the problem that ranging precision is limited under the condition of low communication rate.The system comprises a sending end and a receiving end, wherein the sending end comprises a synchronization header sequence generating module, a data sequence generating module and a framing module, the receiving end comprises a synchronization sliding correlation / rough ranging calculation module, a fine ranging calculation module and a data sequence extracting module; the synchronization header sequence generating module generates a synchronization header sequence, the data sequence generating module generates a data sequence, and the framing module completes splicing of the synchronization header sequence and the data sequence; the synchronization sliding correlation / rough ranging calculation module performs frame synchronization and calculates an integer symbol period of transmission delay, the fine ranging calculation module calculates a fractional symbol period of transmission delay, and the data sequence extracting module performs frame disassembly according to a starting position of the synchronization header sequence, extracts the data sequence and completes communication reception.

The invention discloses a lightweight high-speed photographing system and method based on an event camera, and the system comprises a hybrid imaging module which is used for synchronously collecting the image data and event data of a scene, and comprises a visible light camera and an event camera; the hardware synchronization module is electrically connected with the visible light camera and the event camera, and is used for receiving a frame synchronization signal of the visible light camera and sending a trigger signal to the event camera, so that the event camera inserts a time stamp corresponding to a visible light image frame exposure moment in an event stream; the data processing and fusion unit is in communication connection with the hybrid imaging module and is used for receiving the image data and the event data and executing the following steps: performing time alignment on an event stream and a visible light image frame stream based on a time stamp; operating a high-frequency frame insertion reconstruction algorithm, and reconstructing a multi-frame intermediate image by using event stream data between two frames; synthesizing the original visible light image frame and the reconstructed intermediate image into a high-frame-rate video stream; and the power supply and interface module is used for supplying power to the system and outputting a high-frame-rate video stream.

The embodiment of the invention provides a data transmission method for optical communication and a related device, and solves the problem that a transmission symbol sequence in the prior art cannot be suitable for scenes above 800Gbps. Specifically, a transmitting end acquires a superframe comprising a plurality of subframes, the subframes comprising pilot symbols. Wherein in one polarization direction, the number NPS of pilot symbols in the sub-frame is an even number greater than 0, each pilot symbol is one of four complex numbers, namely-A-Aj,-A + Aj, A-Aj and A + Aj, A is a real number, every continuous NPG symbols in the sub-frame comprise a pilot symbol located at a fixed position, NPG is 96 or 128, the superframe comprises a first type of sub-frame, and the sub-frame comprises a second type of sub-frame. The first type of subframes further comprise NFAW frame synchronization symbols, each frame synchronization symbol is one of four complex numbers including-AFAW-AFAWj,-AFAW + AFAWj, AFAW-AFAWj and AFAW + AFAWj, the AFAW is a real number, and the NFAW is an even number. And further, the transmitting end transmits the superframe. It can be seen that the interval of inserting the pilot symbols in the sub-frame is larger, and redundancy is reduced.

The invention discloses an animation display method and device for a vehicle lamp panel, a vehicle and a storage medium, and the method comprises the steps: receiving each image frame corresponding to a to-be-displayed animation, carrying out the frame synchronization verification of each image frame, and putting the image frames into a buffer pool when the verification is passed; and when the playing event is triggered, sequentially obtaining the image frames from the cache pool and displaying the image frames on the lamp panel. According to the invention, the frame synchronization verification is carried out on the received image frame, so that the phenomenon that the animation display effect does not meet the actual demand of a user due to data frame errors in the image frame transmission process is avoided. Meanwhile, by adopting the strategy of the buffer pool, each image frame is directly acquired from the buffer pool to be displayed when the animation is played, and the data of each image frame does not need to be displayed after the data transmission of each image frame is completed, so that the jamming phenomenon can be reduced, and the smoothness of the animation display of the lamp panel is improved.

The invention discloses an image acquisition method and device, equipment, a storage medium and a program product, and relates to the technical field of image acquisition. The method is used for an image acquisition device, and the image acquisition device comprises a light supplement lamp, a master camera, a slave camera and a controller. The method comprises the following steps: the controller sends a first exposure control signal to the main camera; under the condition that the first exposure control signal is received, the main camera performs periodic exposure; under the condition that single exposure is completed, the master camera sends a frame synchronization signal to the slave camera; under the condition that the frame synchronization signal is received, the slave camera performs exposure; the controller controls the light supplementing lamp to perform periodic light supplementing based on the exposure time of the camera, and the light supplementing time period of the light supplementing lamp covers the exposure time period of the camera; and the master camera and the slave camera transmit acquired image data to the controller.

The invention discloses a channel-associated local oscillator free space continuous variable quantum key distribution method, which comprises the following steps of: initializing a receiving end telescope and a transmitting end telescope, detecting the local oscillator light intensity of a receiving end, adjusting the telescopes to be in an optimal coupling efficiency state, and tracking the change of beacon light through a fine tracking and pointing system of the telescopes so as to maintain the stability of a communication link; a transmitting end performs heterodyne detection on 90% of thermal-state optical signals after polarization and beam splitting of a thermal-state light source, results X and P serve as local initial secret keys, the other 10% of thermal-state optical signals are attenuated and then combined with local oscillation light to be transmitted to a receiving end through a free space channel so as to perform homodyne or heterodyne detection, and corresponding initial continuous secret key data are obtained; and the receiving end performs data frame synchronization, phase compensation, parameter evaluation, error correction and confidentiality enhancement on the obtained initial continuous key data to obtain a binary bit key. The channel associated local oscillator free space CVQKD safe coding based on the thermal state source is realized, and the average key distribution rate under a-15dB attenuation channel reaches a thousand bps magnitude.

The embodiment of the invention provides a data transmission method for optical communication and a related device. Specifically, a transmitting end acquires a superframe comprising a plurality of subframes, the subframes comprising pilot symbols. Wherein, in one polarization direction, the number NPS of pilot symbols in the subframe is an even number greater than 0. Each pilot symbol is one of four complex numbers, namely-A-Aj,-A + Aj, A-Aj and A + Aj, and A is a real number. Each continuous NPG symbols in the subframe comprises one pilot symbol located at a fixed position. The superframe comprises a first type of subframe, the first type of subframe further comprises NFAW frame synchronization symbols, and each frame synchronization symbol is one of four complex numbers of-A-Aj,-A + Aj, A-Aj and A + Aj. One symbol in the first type of subframes is both a pilot symbol and a frame synchronization symbol, and the NFAW is an odd number. And further, the transmitting end transmits the superframe. It should be understood that there is no training symbol in the subframe, which has lower redundancy and simplifies the structure of the subframe.

The invention discloses an electronic outside rear-view mirror image optimization display method based on environment perception and an electronic rear-view mirror, and belongs to the technical field of electronic rear-view mirrors. The method comprises the steps that environment information of a vehicle and state information of the vehicle are collected in real time, marking the same time reference on the image frame of the electronic rearview mirror and the collected data, and constructing to obtain a frame synchronization environment vector; carrying out multi-modal evidence fusion based on the frame synchronization environment vector, forming probabilistic judgment on an environment state, and obtaining a final state decision; using a parameter smooth transition model to calculate according to a state decision result to obtain a final optimization parameter set; and the final optimization parameter set is issued to a DSP chip, and the DSP chip generates a finally presented optimized electronic rearview mirror image. According to the method, the accuracy and robustness of electronic outside rear-view mirror image optimization are effectively improved.

A display device includes a first display panel, a second display panel disposed adjacent to the first display panel, a first touch array disposed on the first display panel, a second touch array disposed on the second display panel, a first touch driver that applies a first touch driving signal to the first touch array in response to a frame synchronization signal, a second touch driver that applies a second touch driving signal to the second touch array in response to the frame synchronization signal, and a common line commonly connected to the first and second touch drivers to transmit the frame synchronization signal, and pulses included in the first touch driving signal and pulses included in the second touch driving signal have phases opposite to each other.

The invention discloses a signal synchronization method and system based on a free space quantum key distribution system, and belongs to the technical field of key transmission. A high-power synchronous laser is adopted as a synchronous light source, a preset frame identification head is adopted to modulate a synchronous light signal, the modulated synchronous light signal serves as reference light and is sent to a receiving end, then synchronous coding is conducted on the synchronous signal received by a synchronous detector of the receiving end, and position information of the synchronous signal is generated and sent to a single photon detector of the receiving end; and performing sequence correspondence on the quantum signal received by the single-photon detector at the receiving end and the synchronizing signal according to the position information to finish signal synchronization. Frame synchronization is achieved through the synchronous laser, bit synchronization is achieved through synchronous coding and sequence correspondence, interference of an atmospheric channel can be effectively resisted, and the bit error rate of the system is reduced.

The invention discloses an intelligent diagnosis method for power equipment primitive state recognition and rule fusion, and relates to the technical field of power system dispatching automation. The method is used for substation dispatching master station monitoring picture equipment primitive state recognition and abnormity diagnosis, video and graph model library data acquisition, preprocessing denoising, frame synchronization and ROI extraction. Using the improved YOLOv8-Tiny to extract a multi-modal feature to identify a primitive state; establishing an expert experience rule base, a graph-model association rule base and an anomaly judgment rule base; performing primary diagnosis on the forward chain reasoning fusion rule; performing cross checking on telecommand consistency, telemetering relevance and graph model library integrity; and outputting a result coexistence log. The problems that manual checking is low in efficiency and prone to omission are solved, the reliability of primitive recognition and correlation checking is improved, a D5000 system and a domestic operating system are adapted, complex monitoring scenes are coped, the operation and maintenance burden is relieved, it is guaranteed that monitoring pictures of a dispatching master station are accurate, and safe operation and maintenance of a power grid are facilitated.

The invention provides an LED constant-current driving chip and a display system, and relates to the field of display. The LED constant current driving chip comprises a line feed signal generation module, a display data cache module, a display control module and a constant current driving module. The line feed signal generation module is used for resetting in response to the received frame synchronization signal, and counting or timing based on the frame synchronization signal and a line feed period so as to periodically output a line feed signal; the display data caching module is used for caching the input display data; the display control module is used for generating a PWM (Pulse Width Modulation) signal according to the line feed signal and the display data read from the display data cache module; and the constant current driving module outputs a constant current driving signal based on the PWM signal so as to drive a corresponding LED lamp bead to emit light. The LED constant-current driving chip provided by the invention can output the line feed signal under the condition of no ROW line, so that the wiring is simplified, and the port utilization rate is improved.

The present application discloses a frame synchronization method, device, equipment, storage medium and program product, which belongs to the field of computer technology. The method includes: obtaining a predicted network delay time, the predicted network delay time is the predicted network delay time of a data frame; based on the predicted network delay time and the remaining display time, updating the display interval of the client, the remaining display time is the playback time corresponding to at least one cached display frame, and the display interval is used to indicate the time corresponding to playing the cached display frame in a single refresh; based on the display interval, the cached display frame is played to refresh the game screen. Through the above method, the problem of game screen freeze caused by network delay within a period of time can be effectively combated. In addition, the number of cached display frames in the client can be dynamically adjusted based on the predicted network delay time and the remaining display time corresponding to the cached display frame, thereby reducing the player's operation feedback delay.

The invention discloses an image exposure parameter obtaining method and device, equipment and a medium, and relates to the field of image processing, and the method comprises the steps: a processor determines a current timestamp when obtaining a frame synchronization signal sent by a deserializer; obtaining a current frame exposure image sent by an image sensor in the camera, and determining image exposure starting time corresponding to the current frame exposure image based on the current timestamp and a preset time delay; wherein the current frame exposure image is an image obtained after a serializer in the camera controls an image sensor to start exposure based on a frame synchronization signal sent by a deserializer; the deserializer sends a frame synchronization signal to the serializer and the processor at the same time; the preset time delay is a difference value between the time when the serializer obtains the frame synchronization signal and the time when the image sensor starts to expose. Under the condition of not depending on the timestamp generation function of the image sensor, the image exposure starting time is calculated through the processor, the application range of the scheme is expanded, and the accuracy and the stability are higher.

The invention provides a digital receiver circuit and a control method thereof. The digital receiver circuit comprises a frame synchronization detection module, a symbol synchronization detection module and a symbol decoding module, the frame synchronization detection module comprises a first matched filter and a first peak detection module; the first matched filter is used for performing convolution operation on a guide code sequence in the received synchronization signal to obtain a convolution operation result; the first peak value detection module is used for determining the position of a convolution peak value according to the convolution operation result; determining the end position of the guide code sequence according to the position of the convolution peak value; the symbol synchronization detection module is used for detecting positioning information of an end position of each symbol in effective data connected with the guide code sequence; according to the positioning information, determining a pulse sequence corresponding to a judgment moment of symbol decoding of the effective data; and the symbol decoding module is used for performing symbol decoding on the effective data according to the judgment time and the pulse sequence. The technology can improve the accuracy of signal detection and decoding.

The invention discloses a parallel receiving method and system for high-speed 16 QAM (Quadrature Amplitude Modulation) data demodulation, and the method comprises the following steps: S1, carrying out the sampling of received intermediate-frequency 16 QAM data through a high-speed ADC (Analog to Digital Converter), and obtaining four paths of signals through the serial-to-parallel conversion function of the ADC; s2, converting the four paths of signals into 32 paths of parallel signals at a conversion rate of 1: 8 by using a serial-to-parallel converter special for the FPGA; and S3, carrying out digital orthogonal down-conversion on the 32 paths of parallel signals to obtain 16 paths of baseband signals of an I path and a Q path, and then sequentially carrying out matched filtering, timing synchronization, blind equalization, carrier synchronization, frame synchronization and 16QAM judgment decoding to complete parallel receiving. According to the invention, the requirement of high bit rate is met based on three key technologies of timing synchronization, blind equalization and carrier synchronization, and the receiving and demodulation recovery functions of high-speed data in a 16 QAM modulation mode can be effectively completed.

This application provides example communication methods and devices. One example method is applied to a receiving device, and the method includes receiving a first data frame, where the first data frame includes a plurality of pieces of synchronization information, and the plurality of pieces of synchronization information are all used for frame synchronization. Frame synchronization is performed on the first data frame based on one or more of the plurality of pieces of synchronization information.