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.

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 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.

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 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 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.