30results about How to "Solve bit errors" patented technology

The invention provides a coding method and apparatus in secondary ultrasonic communication. A plurality of frequency points in a secondary ultrasonic communication frequency band and four kinds of symbols are respectively set, wherein the four kinds of symbols respectively are a data synchronous code E, binary data "0", binary data "1", and a data repetition code "P"; to-be-sent data are determined and if two bits of identical data for continuous sending exit in the to-be-sent data, the data repetition code is used for replacing the second-bit data; the to-be-sent data are coded according to a data coding format and data frames after coding are transmitted, thereby realizing secondary ultrasonic communication. Besides, the data coding format successively includes a data communication start code, a check code, net load data, and a data transmission end mark code; and the data communication start code is formed by synthesis of the data synchronous code E and the data repetition code P. According to the invention, a problem that an error code occurs due to identical data continuous sending caused by inaccurate communication synchronization in the prior art can be solved; and the transmission accuracy rate can be improved.

The invention discloses a small current grounding fault distinguishing and positioning method based on a fault indicator. The method comprises the following steps: time-checking and synchronizing a human collecting unit; synchronously triggering a collecting unit and collecting a current and a voltage; calculating a zero-sequence current, a zero-sequence voltage and a derivative value of zero-sequence voltage time-checking; calculating a zero-sequence current transient-state polarity characteristic value at fault moment and a transient-state polarity characteristic value of the derivative value of the zero-sequence voltage time-checking; calculating a small current grounding fault characteristic value of each fault indicator and judging whether a fault occurs; and positioning a position inwhich the small current grounding fault occurs. The method is capable of, through a local collecting unit and the collecting unit, predicating the small current grounding fault, wherein a remote master station does not need to analyze a large amount of recording data through a complicated algorithm so as to position the grounding fault; and solving an error code problem caused by transmission ofa large amount of the recording data and a cost problem of high data traffic.

The invention relates to a position measurement device based on a two-dimensional pseudo-random code, which belongs to the technical field of position measurement. The position measurement device is characterized by comprising a measurement coding ruler, a measurement head element, a stimulus signal generating unit, a signal conditioning unit and a position information processing unit, wherein an object to be measured is connected to the measurement coding ruler; the measurement coding ruler comprises non-magnetic coding elements, measurement magnetic coding elements, and fault-tolerant magnetic coding elements, wherein the non-magnetic coding elements and measurement magnetic coding elements are arranged correspondingly according to a measurement dimensional coding sequence mode and the fault-tolerant magnetic coding elements are inserted among different coding elements; the arrangement sequence of the fault-tolerant magnetic coding elements is in same correspondence to a fault-tolerant dimensional coding sequence; the coding elements are arranged according to the sequence and then are mutually coaxially connected; and the position information processing unit analyzes type information of the corresponding coding elements inside the measurement head element, wherein the type information is transmitted by the signal conditioning unit and is obtained by the sampling of the measurement head element, and the position information of the measured object is obtained after the type information is processed. The invention has the advantages of good extension property, high reliability and simple structure.

Embodiments of the invention provide a power transmission line online monitoring information acquisition method, device and system. The method includes the steps of sending an acquisition instruction; receiving one or more data packets returned by a sensor; if each data packet contains a data packet header, deleting characters located before the data packet header, and if each data packet contains a data packet tail, deleting characters located after the data packet tail; determining whether the remaining characters in each data packet are preset valid characters, and if not, deleting the characters; assembling the remaining characters in all the data packets to obtain a reassembled data packet; verifying the reassembled data packet according to a preset verification rule; and if the verification fails, discarding the reassembled data packet and resending an acquisition instruction. According to the invention, the problem of data packet bit errors caused by electromagnetic interference and the like is effectively solved, the reliability of the power transmission line online monitoring system is improved, and the advantages of low cost, good maintenance and the like are gained.

The invention discloses microwave communication equipment and system, and a method for eliminating the impact from phase jump, and relates to the field of communication. The method can be used for eliminating the impact from phase jump completely, and the capability, of the microwave communication equipment, of resistance to the phase jump is improved. A problem that an error code happens to the communication system because of the phase jump of the microwave communication equipment is solved. The microwave communication equipment comprises a frequency source, a phase jump collection unit which is used for collecting the phase jump information of the frequency source, and a configuration processing unit which is used for correcting a base-band data signal according to the collected phase jump information so as to eliminate the impact from the phase jump. The invention also provides a microwave communication system which comprises the microwave communication equipment provided by the invention.

The invention belongs to the technical field of remote motor monitoring, and discloses a remote motor monitoring system and method, and the remote motor monitoring system comprises a parameter acquisition module, a can-to-wifi module, a main control module and a data transmission module, wherein the parameter acquisition module comprises a three-phase current acquisition module, and a motor speedacquisition module. The invention, by organically combining the motor parameter detection and collection, wireless network technology, industrial field bus technology and computer user software, realizes remote real-time monitoring, control and management of the motor's long-distance travel status, and achieves system management in terms of intelligence, networking and systematization. The invention can measure various parameters during the operation of the motor more accurately, can realize real-time remote data transmission, and can timely send an alarm signal or give prompt information whena certain parameter of the motor is detected abnormally.

The invention discloses an M-FSK modulation method, device and system. The method comprises the following steps: setting a modulation format of a Preamble code of a Preamble frame, and sending a symbol of the Preamble code by using the set modulation format; determining the modulation bit number of the SYNC frame according to the modulation order, determining the bit number of the SYNC code according to the supported sending format number, encoding the SYNC code, and mapping the encoded SYNC code to the SYNC frame; defining different modulation modes by using different SYNC codes, sending theSYNC code corresponding to the selected modulation mode in the SYNC frame, and modulating and sending the Data frame of the frame structure by using the selected modulation mode. By adopting the technical scheme of the invention, 2FSK is compatible, an M-FSK modulation technology can also be adopted, the error code problem caused by the spectrum utilization rate and a fading channel is solved, andthe coverage is effectively improved.

The present application provides a refresh cycle adjustment method, a DDR controller, and a DDR system, in order to solve the bit error problem of some DDR particles at the end of life whose Data retention capability does not meet the DDR specifications due to aging. The method in embodiments of the present application comprises that: the DDR controller determines a specific memory cell of the DDRparticle, wherein the DDR particle comprises the a specific memory cell and a non-specific memory cell, and the data retention capacity of the specific memory cell is consistent with the data retention capability of the non-specific memory cell; the DDR controller carry out data retention capability on the specific memory cell according to a specific refresh cycle to obtain a specific scan result; and the DDR controller adjusts the refresh cycle of the non-specific memory cell according to the specific scan result.

The invention provides a double-bit-check coding and decoding method, can detect source data error generated due to interference, and effectively guarantees the correct transmission of data so as to solve the error code problem in data transmission with low cost. The method comprises a coding process, a decoding process and a checking process. In the coding process, when a frame of raw data is received, bit by bit logic negation is carried out to each data bit of the frame, the logic negations of the obtained raw data bits are the check bits of raw data bits, and coding is carried out to the raw data by adopting the mode of inserting each check bit of the raw data bits behind each data bit of the frame data. In the decoding process, decoding is carried out to receive coded data, and decoded raw data bits and decoded check data bits are respectively obtained. In the checking process, whether the decoding check bits are the logic negations of decoded raw data is judged, and when the decoding check bits are the logic negations of decoded raw data, the raw data are judged to be correctly transmitted.

The invention discloses a small current grounding fault distinguishing and positioning method based on a fault indicator. The method comprises the following steps: time-checking and synchronizing a human collecting unit; synchronously triggering a collecting unit and collecting a current and a voltage; calculating a zero-sequence current, a zero-sequence voltage and a derivative value of zero-sequence voltage time-checking; calculating a zero-sequence current transient-state polarity characteristic value at fault moment and a transient-state polarity characteristic value of the derivative value of the zero-sequence voltage time-checking; calculating a small current grounding fault characteristic value of each fault indicator and judging whether a fault occurs; and positioning a position inwhich the small current grounding fault occurs. The method is capable of, through a local collecting unit and the collecting unit, predicating the small current grounding fault, wherein a remote master station does not need to analyze a large amount of recording data through a complicated algorithm so as to position the grounding fault; and solving an error code problem caused by transmission ofa large amount of the recording data and a cost problem of high data traffic.

The embodiment of the invention provides a 4.8kb / s data service transmission method based on an IP (Internet Protocol) GSM-R (Global System for Mobile Communications-Railway) network. The method mainly comprises the following steps: a BTS (Base Transceiver Station) receives a data frame sent from an air interface by a vehicle-mounted terminal, and the data frame is identified to be a 4.8kbit / s data frame; the BTS carries out speed conversion processing on a 4.8kbit / s data business frame to obtain a 64kb / s standard data frame; the BTS sends the 64kb / s standard data frame to BSC (Base Station Controller) equipment through an IP Abis interface. According to the 4.8kb / s data service transmission method, the Abis interface based on IP transmission adopts a transmission speed of 64kb / s and an RTP frame packaged with the 64kb / s standard data frame is directly sent to the BSC equipment, so that a speed conversion process of TRAU including RAA, RA2 code rate conversion and the like is omitted; the BSC equipment can directly transmit to train control server equipment including MSC and the like at the speed of 64kb / s, so that the end-to-end data transmission delaying is greatly reduced, the data transmission reliability is improved, and the CTCS-3 railway safety data transmission reliability is improved.

The invention discloses a semi-asynchronous CAN bus control method based on single-bit synchronization and a controller. The semi-asynchronous CAN bus control method based on single-bit synchronization comprises the following steps: generating a communication clock through a frequency division mode; enabling a communication clock to collect a start bit of a to-be-synchronized signal, wherein the start bit is a single-bit dominant signal; triggering a frequency divider to reset while a synchronizing signal is collected, so the initial phase of the communication clock is synchronized with the synchronizing signal. The asynchronous communication does not require a clock but requires a frequency, so that unequal-interval communication is realized, the communication efficiency is improved, the phase of the clock is flexibly changed on the basis of the synchronous communication by the semi-synchronous communication, and an unequal-interval communication function similar to the asynchronous communication is realized. Semi-asynchronous communication in the invention is based on asynchronous communication, and a synchronous clock is recovered from data so as to realize pseudo signal synchronization, that is, the error code problem in the asynchronous communication process is solved by the inaccurate synchronous clock.

The invention provides a method for simulating a multi-circuit dual-full-duplex serial port under an ARM (advanced RISC machine) platform LINUX system. The method is characterized in that by establishing an interrupt environment and initializing a simulated serial port interface, the communication of a simulated serial port can utilize FIQ (fast interruption quest) interrupt to receive and transmit the data, a non-maskable property for the LINUX system can be achieved, the high real-time property can be realized, and the error code problem can be basically prevented under the situation that the appropriate frequency is provided. The entire scheme is established according to a UART (universal asynchronous receiver / transmitter) drive framework under the LINUX system, so that the interface uniformity under the LINUX system can be guaranteed, the simulated serial port is identical to an interface of an ordinary serial port in use, a receiving baud rate and a transmitting baud rate can be respectively arranged, the full fuplex is received and transmitted, convenience can be realized; and only one hardware timer is used on the aspect of the hardware resource, only two ordinary GPIO (general purpose input / output) ports are added for adding multiple serial ports, no additional resource is needed, and the expandability is strong.

A method for processing long-distance high-definition video includes obtaining original high-definition video data by high-definition digital camera, sending it to high-definition video acquisition card through HDMI interface, and obtaining standard curve corresponding to video image by video image processing module, obtaining standard curve corresponding to high-definition video image by HDMI interface, obtaining standard curve corresponding to high-definition video image by HDMI interface. The corresponding standard curve of video image is adjusted according to the target curve to obtain thevideo image after strong light suppression processing. The video image to be outputted is converted by a video standard converter to obtain an outputted video image. An output video image is compressed and decoded by a blanket coding and decoding process, each image is divided into a plurality of sub-images, and quantized video objects, motion vectors, quantized horizontal inconsistencies, quantized vertical inconsistencies, quantized luminance residual textures and quantized chrominance residual textures of each sub-image are output and classified. High-definition video can be captured in strong light and weak light, which can reduce the bit error rate and packet loss rate of wireless transmission channel.

The invention discloses E1 signal acquiring equipment. The E1 signal acquiring equipment comprises a bus, a service acquiring module, an output Ethernet port, at least one E1 signal interface, a corresponding code rate adjusting cache and a code rate adjusting control module, wherein the E1 signal interface is used for receiving an E1 signal and transmitting byte data corresponding to the E1 signal to the corresponding code rate adjusting cache; the code rate adjusting control module is used for outputting a control signal according to the cache region residual capacity of the code rate adjusting cache; the code rate adjusting cache is used for caching the byte data transmitted by the E1 signal interface, and adjusting the clock frequency of the byte data according to a preset clock signal, and outputting the byte data to the bus according to the control signal output by the code rate adjusting control module; and the service acquiring module is used for receiving and processing the byte data, and outputting the data to the output Ethernet port. Through adoption of the E1 signal acquiring equipment, clock non-synchronization of an accessed E1 signal is permitted, and the phenomenaof error code and packet loss are avoided.

The embodiment of the invention provides a 4.8kb / s data service transmission method based on an IP (Internet Protocol) GSM-R (Global System for Mobile Communications-Railway) network. The method mainly comprises the following steps: a BTS (Base Transceiver Station) receives a data frame sent from an air interface by a vehicle-mounted terminal, and the data frame is identified to be a 4.8kbit / s data frame; the BTS carries out speed conversion processing on a 4.8kbit / s data business frame to obtain a 64kb / s standard data frame; the BTS sends the 64kb / s standard data frame to BSC (Base Station Controller) equipment through an IP Abis interface. According to the 4.8kb / s data service transmission method, the Abis interface based on IP transmission adopts a transmission speed of 64kb / s and an RTP frame packaged with the 64kb / s standard data frame is directly sent to the BSC equipment, so that a speed conversion process of TRAU including RAA, RA2 code rate conversion and the like is omitted; the BSC equipment can directly transmit to train control server equipment including MSC and the like at the speed of 64kb / s, so that the end-to-end data transmission delaying is greatly reduced, the data transmission reliability is improved, and the CTCS-3 railway safety data transmission reliability is improved.

The invention discloses a mobile terminal as well as a method and a device for data transmission, which belongs to the technical field of mobile terminals. The method comprises the following steps that a data transmitting terminal acquires carrier frequency data which are encoded to be binary when receiving a starting instruction, the data transmitting terminal selects continuous identical binary values in the carrier frequency data, maintains a first continuous identical binary values, encodes the other binary values by using repeating codes, and transmits the encoded carrier frequency data, and when receiving the encoded carrier frequency data, the mobile terminal analyzes the repeating codes in the carrier frequency data and decodes the repeating codes into a previous binary value. By adopting the mobile terminal, the problem of error codes caused by imprecise synchronization when peripheral communicates with the mobile terminal is avoided.

The invention provides a data transmission method of a single-line cascade circuit and an LED chip cascade system, and the method comprises the steps: starting a decoding clock when the input data is detected to be a set waveform; generating a first data waveform at t1, and transmitting the first data waveform to a next-stage circuit; sampling and judging the waveform of the input data at t2; when it is judged that the bit is 0, changing the first data waveform into a second data waveform and stopping decoding the clock; when it is judged that the bit is 1, changing the first data waveform into a second data waveform at t3, and stopping clock decoding; and from the stop of the decoding clock to the next t1, transmitting the second data waveform in a single line to the next stage of circuit. When the output data is at a high level, the length of the output data is integral multiples of a decoding clock period, the problem that the high level is gradually widened or narrowed due to cascade circuit transmission is avoided, and the error code problem of data transmission is solved. Moreover, the transmission duration of bit 0 is shortened, so that the overall data transmission speed of the LED chip cascade system is improved.

The invention discloses a signal processing method, device and signal receiver. The method includes: according to the verification relationship set during forward error correction coding, whether a phase jump occurs in the data segment of the detection signal and the degree of the phase jump occurs; according to the degree of the phase jump, the phase jump occurs Perform phase correction on the data segment; perform confidence correction on the data segment with phase jump and phase correction; perform forward error correction judgment decoding on the data segment after confidence correction, and output the processed data segment. The device is a device for implementing the method. The signal receiver is a signal receiver comprising the device. The signal processing method, device and signal receiver of the present invention greatly reduce the influence of phase jump misjudgment on judgment decoding by performing phase correction and confidence correction on the data segment of the signal, thereby solving the problem caused by phase jump. Bit error problem.

The embodiment of the present invention provides a transmission line online monitoring information collection method, device and system, the method includes: sending a collection command; receiving one or more data packets returned by the sensor; if the data packet contains a data packet header, the Delete the characters before the data packet header, if the data packet contains the data packet tail, delete the characters after the data packet tail; judge whether the remaining characters in each data packet are preset valid characters, if not, delete; combine the remaining characters in all data packets to obtain a reassembled data packet; verify the reassembled data packet according to the preset verification rules; if the verification fails, discard the reassembled data packet and resend the collection command. The invention effectively solves the error code problem of the data packet caused by electromagnetic interference and the like, improves the reliability of the on-line monitoring system of the transmission line, and has the advantages of low cost, easy maintenance and the like.

The invention relates to a position measurement device based on a two-dimensional pseudo-random code, which belongs to the technical field of position measurement. The position measurement device is characterized by comprising a measurement coding ruler, a measurement head element, a stimulus signal generating unit, a signal conditioning unit and a position information processing unit, wherein anobject to be measured is connected to the measurement coding ruler; the measurement coding ruler comprises non-magnetic coding elements, measurement magnetic coding elements, and fault-tolerant magnetic coding elements, wherein the non-magnetic coding elements and measurement magnetic coding elements are arranged correspondingly according to a measurement dimensional coding sequence mode and the fault-tolerant magnetic coding elements are inserted among different coding elements; the arrangement sequence of the fault-tolerant magnetic coding elements is in same correspondence to a fault-tolerant dimensional coding sequence; the coding elements are arranged according to the sequence and then are mutually coaxially connected; and the position information processing unit analyzes type information of the corresponding coding elements inside the measurement head element, wherein the type information is transmitted by the signal conditioning unit and is obtained by the sampling of the measurement head element, and the position information of the measured object is obtained after the type information is processed. The invention has the advantages of good extension property, high reliability and simple structure.

The invention discloses a correction method of deflector ring error code in image transmission of an optical imaging system. The method utilizes RS (Reed Solomon) code as the algorithm of error-correcting code, selects a RS code parameter according to the actual size of transmitted image and the error-correcting requirement, and then designs the relevant error-correcting code and decoding module according to the selected parameter and the transmission characteristic of deflector ring, thereby realizing the correction of deflector ring error code during the image transmission. The invention has the advantages that the invention can efficiently correct the burst error during the image transmission of deflector ring in time, ensure the image data obtained by the optical imaging system to be correctly transmitted to the receiver terminal, and ensure the original image to be restored for the next analysis and treatment.

The embodiment of the invention discloses an ACARS message identification method and device, a server and a storage medium, and the method comprises the steps: receiving an ACARS message; filtering the received ACRAS message so as to ensure that the filtered ACRAS message is complete; and carrying out key information extraction on the filtered ACRAS message to obtain an effective ACARS message. Error codes caused by transmission errors and human factors can be effectively solved, the accuracy and integrity of air-ground data are further improved, and the adaptability and expansibility of message parameter decoding are enhanced.

The embodiment of the invention provides a data transmission method and device based on a satellite-borne optical fiber interface. The method comprises the following steps: receiving a data packet sent by a data sending end through a satellite-borne optical fiber interface; checking each frame of data in the process of reading and writing the data in the data packet frame by frame; when an error information frame is verified, generating a retransmission signal containing the error information frame; and sending the retransmission signal to the data sending end, so that the data sending end retransmits corresponding data according to the error information frame. According to the embodiment of the invention, the error codes in the high-speed interface transmission process can be effectivelysolved, the link reliability is ensured under the condition of extremely low transmission rate loss, the hardware implementation of the method only uses one dual-port RAM and a small number of Slices,the resource occupancy rate is low, and the higher cost required for changing a system and a hardware circuit is saved.

The invention discloses a method and device for correcting the communication error codes of a motor encoder. The method includes the following steps that: the real-time rotation speed of a motor is collected, and the deviation threshold value of adjacent position data output by the encoder is selected according to the rotation speed; whether communication error codes exist on the encoder is judged according to current position data output by the encoder, last position data adjacent to the current position data, and the deviation threshold value; and when the communication error codes exist on the encoder, the current position data of the encoder in the continuous data interval of the encoder are determined according to the last position data and the deviation threshold value, and the current position data of the encoder in the discontinuous data interval of the encoder are determined according to the minimum value or maximum value of the position data outputted by the encoder and the deviation threshold value. With the method adopted, the problem of the error codes of communication data due to the possible disturbance of external environment in practical application can be solved, and the real-time validity of the position signals of the encoder can be ensured.