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

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 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.

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 present invention provides a coding method and device in sub-ultrasonic communication. Multiple frequency points in the sub-ultrasonic communication frequency band are selected and set as 4 kinds of symbols respectively, which are respectively data synchronization code E, binary data "0", binary data " 1" and data repetition code "P"; determine the data to be sent, if there are two consecutive bits of data in the data to be sent, use the data repetition code to replace the second bit of data; encode the data to be sent according to the data Format is encoded, and the encoded data frame is transmitted to realize sub-ultrasonic communication. The data encoding format is sequentially data communication start code, check digit, payload data and data transmission end flag code. The data communication The start code is composed of data synchronization code E and data repetition code P alternately. The invention solves the problem in the prior art that continuous sending of the same data will cause code errors due to inaccurate communication synchronization, and improves the transmission accuracy.

Disclosed are a microwave communication device and system, and a method for eliminating the effect of phase jumping, which relate to the field of communications, can radically eliminate the effect of phase jumping, improve the capability of the microwave communication device for resisting the phase jumping, and solve the problem that a code error occurs in the communication system because of the phase jumping of the microwave communication device. The microwave communication device of the present invention comprises: a frequency source, and further comprises: a phase jumping collection unit which is used for collecting the phase jumping information about the frequency source, and a configuration processing unit which is used for performing phase correction on a baseband data signal according to the collected phase jumping information, so as to eliminate the effect of the phase jumping. Also provided is a microwave communication system which comprises the microwave communication device as claimed in the present invention.

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 present application discloses an M-FSK modulation method, device and system. The method includes setting the modulation format of the Preamble code of the Preamble frame, and using the set modulation format to send the symbols of the Preamble code; determining the number of modulation bits of the SYNC frame according to the modulation order, and determining the SYNC code according to the number of supported transmission formats The number of bits, encode the SYNC code and map it to the SYNC frame; use different SYNC codes to define different modulation methods, send the SYNC code corresponding to the selected modulation method in the SYNC frame, and use the selected modulation method to frame The Data frame of the structure is modulated and sent. The technical solution of this application is not only compatible with 2FSK, but also can use M‑FSK modulation technology to solve the problem of spectrum utilization and bit errors caused by fading channels, and effectively improve coverage.

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 device and method for long-distance signal transmission. The device includes a QSPI signal control terminal, a signal mutual conversion module and a QSPI signal equipment terminal; the QSPI signal control terminal outputs the QSPI signal in the form of a differential signal, and the QSPI signal Including the differential clock output signal; the signal mutual conversion module receives the differential signal and the QSPI feedback signal returned by the QSPI signal receiving end in the form of a single-ended signal after obtaining the QSPI signal; and realizes the bidirectional conversion of the differential and single-ended signal; the QSPI signal The device end is set at the near end of the signal conversion module, and outputs the QSPI feedback signal in the form of a single-ended signal; the QSPI feedback signal includes a single-ended clock return signal; the single-ended clock return signal is converted into a differential clock return by the signal conversion module The signal is used as the data recovery clock of the QSPI signal control terminal; the present invention performs differential and single-ended conversion on the signal transmission mode, and at the same time designs the returned clock signal at the device end to realize high-speed, high-quality, and long-distance transmission of the signal.

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.