53results about How to "Reduce delay error" patented technology

The invention relates to a data acquisition method for a sensor network, a gateway and a data acquisition system. The sensor network comprises a plurality of sensor nodes. The data acquisition method comprises the steps of: respectively comparing a variable quantity of received data sent by each sensor node in a preset time period with a corresponding preset value; judging whether the data of which the variable quantities reach the corresponding preset values exists; and increasing acquisition frequencies of the sensor nodes corresponding to the data of which the variable quantities reach the corresponding preset values to a first acquisition frequency. According to the invention, the acquisition frequencies of different sensor nodes are controlled by utilizing the same gateway, the condition that the uploaded data is out of sync cannot be generated, and the data acquisition method, the gateway and the data acquisition system are beneficial to analysis processing of a background server on the data.

An embodiment of the present invention provides a message processing method and device, and an electronic device. A plurality of timing queues are provided, and the plurality of timing queues correspond to a plurality of preset delay levels respectively. The message processing method includes: receiving a timing message, and writing the timing message into a data file; storing index information ofthe timing message in the corresponding timing queue according to the delay level of the timing message; separately monitoring the plurality of timing queues to determine whether there is a timing message that satisfies a preset delivery condition; delivering the index information of the timing message that satisfies the preset delivery condition to a target queue if there is a timing message that satisfies the preset delivery condition so as to allow the user to acquire the timing message that satisfies the preset delivery condition through the index information. The invention improves the timing message stacking capability, and when the number of timing messages is large, the timing message delay errors can be reduced, and the timing messages are guaranteed to be delivered on time to agreater extent.

The invention provides a method for combining a tri-band code wave pseudorange with a carrier phase in satellite navigation and positioning, relating to the technology of the satellite navigation and positioning. The method comprises the following steps of: using terminal equipment to receive the satellite downlink three code wave pseudoranges and the carrier phase; obtaining a code wave combined pseudorange and a carrier combined phase according to an integral coefficient combination, selecting a positive combination coefficient or a negative combination coefficient according to the principle that the time which is influenced by an ionosphere for closing to and solving ambiguity is short, and fast solving the ambiguity by the positive combination or the negative combination; and according to the principle that an ionosphere influence in a satellite-ground distance can be fast removed, selecting the combination coefficient to set up a double positive combination carrier wave which is used for removing the ionosphere influence in the satellite-ground distance, and using more than four (including four) pseudorange observation equations to solve the real position of the receiving terminal. The invention can set up a new system which not only can realize the high dynamic state of the code wave but also has the high precision of the carrier wave.

Optically controlled microwave beam forming networks comprise 2N single frequency DFB lasers of different wavelengths, , 2N electro-optic intensity modulators, 2N *1 passive wavelength division multiplexers, an optical fiber, 1*2N optical beam splitter, 2N fiber collimator, a time delay network module, 2N coupled lenses, 2N photoelectric detectors and 2N low noise amplifiers, wherein N is an integer larger than 2. The optically controlled microwave beam forming networks have the advantages of the high signal to noise ratio, good dynamic performance, high time delay precision, continuous adjustability, and good stability, and are easy to be extended in the system array size.

The invention discloses a dry-type transformer partial discharge on-line monitoring device and a positioning method of the monitoring device, wherein a first ultrasonic transducer, a second ultrasonic transducer, a third ultrasonic transducer and a fourth ultrasonic transducer are respectively used for acquiring four ultrasonic signals in a partial discharge signal, and transmitting the ultrasonic signals to a signal processing unit; an ultrahigh frequency transducer is used for acquiring an ultrahigh frequency signal in the partial discharge signal, and transmitting the ultrahigh frequency signal to the signal processing unit; the signal processing unit is used for carrying out amplification and filtering processing on four ultrasonic signals and one ultrahigh frequency signal respectively, and transmitting the processed four ultrasonic signals and one ultrahigh frequency signal to a data acquisition card; the processed four ultrasonic signals and one ultrahigh frequency signal are respectively converted into four ultrasonic digital signals and one ultrahigh frequency digital signal and are stored up; after a trigger requirement is achieved, the four ultrasonic digital signals or the four ultrasonic digital signals and one ultrahigh frequency digital signal are transmitted to a computer; and the computer calculates so as to position a partial discharge position.

The embodiment of the invention provides clock delay detection and compensation methods and devices, a terminal and a readable storage medium, and the clock delay detection method comprises the steps:transmitting a first synchronous clock to a to-be-detected clock module through a first physical link; receiving a feedback clock which is transmitted by the to-be-detected clock module through a second physical link and is adjusted according to the phase of the first synchronous clock, and determining the delay of the to-be-detected clock module according to the feedback clock, the self-return clock, the delay parameter corresponding to the first physical link and the delay parameter corresponding to the second physical link. The invention also provides the clock delay detection and compensation methods and devices, the terminal and the readable storage medium. By calculating the delay of a main clock module and the delay caused by the physical characteristics of a first physical link and a second physical link, the error of time delay caused by detecting clock distribution of switch equipment can be further reduced, so that the precision of clock time delay detection is improved.

The invention provides a self-adaptive drive circuit for an environment-friendly switching mode power supply chip and relates to the technical field of electronic circuits. The self-adaptive drive circuit comprises a delayer circuit, a drive biasing circuit, a detecting circuit, a clamping circuit and a drive current circuit. The output end of the detecting circuit is connected with the input end of the delayer circuit. The delayer circuit detects drive loads by detecting the time when a signal of the output end of the detecting circuit is at a high level. A bias voltage circuit is connected with the output end of the delayer circuit and used for providing different bias voltages for the drive current circuit according to the drive loads. The clamping circuit is connected with the drive current circuit and used for limiting the maximum of the voltage of the output end of the drive current circuit. The drive current circuit is used for adjusting currents of the output end of the drive current circuit according to the different bias voltages. The circuit adjusts the drive currents according to the drive loads, difference of drive delay under the various loads is reduced, and the high conversion efficiency is achieved.

The invention discloses a high-precision time delay, and belongs to the field of electrical equipment. According to the high-precision time delay, a power supply module, a storage module, a communication module, a switch, a crystal oscillator module, a reset module and a relay body are connected with a control module. The power supply module comprises a capacitor C1, a capacitor C2, a capacitor C3, a resistor R1, a Resistor R2, a resistor R3, a voltage-regulator tube DW1 and an electrical bridge. One end of the capacitor C1 is connected with a 220 v power source, and the other end of the capacitor C1 is connected with an electrical ridge input end. The resistor R1 is connected to the two ends of the capacitor C1 in a cramp joint mode. The two output ends of the electrical bridge are connected with the capacitor C2, the resistor R2, the resistor R3, the voltage-regulator tube DW1 and the capacitor C3 respectively. The capacitor C2, the resistor R2, the resistor R3, the voltage-regulator tube DW1 and the capacitor C3 are connected in parallel. Through improvement on the power supply module, the high-precision time delay is simple in structural line, small in delay error and high in accuracy. The time of the relay can be as precise as millisecond.

The invention discloses a double-array correlation standing wave field ultrasonic suspension and control system and method based on an FPGA. The system comprises an upper supporting plate, a lower supporting plate, a plurality of ultrasonic transducers distributed on the upper supporting plate and the lower supporting plate, and a driving module used for driving the ultrasonic transducers. The driving module comprises a plurality of chips which are connected in parallel; the suspension method comprises the following steps of: s1, reversely solving the phase and duty ratio information of each ultrasonic transducer on two correlation ultrasonic transducer arrays at each moment of particle control by utilizing the characteristics, positions and motion parameters of suspended particles; and s2, calculating the phases and the duty ratios of all the ultrasonic transducers, and transmitting the phases and the duty ratios into software; and s3, through software, carrying out input design, timesequence constraint, analysis integration and board-level debugging on a time sequence circuit required by the ultrasonic phased array; according to the invention, operation control is carried out based on the time sequence circuit designed by the FPGA, so that the phase output delay error is greatly reduced.

The invention discloses a system for simulating communication between nodes, which comprises a control unit, a virtual concentrator, a hardware simulator and a virtual data acquisition terminal. The control unit is respectively connected with the virtual concentrator, the hardware simulator and the virtual data acquisition terminal. The hardware simulator is also connected with an upper layer module for loading protocol layer and application layer software. The virtual concentrator can simulate the function of the concentrator to send operation commands and collect operation results. The hardware simulator can simulate the message sending and receiving function of a communication node of a power carrier communication network and is controlled by the upper layer module. The virtual data acquisition terminal can simulate the function of generating message and the function of sending and receiving message of the data acquisition terminal. A control unit is configured to configure the hardware simulator, the virtual concentrator and the virtual data acquisition terminal; and connects the hardware simulator and the virtual data acquisition terminal to form an analog power carrier communication network.

The invention belongs to the technical field of CAN bus communication engineering, and particularly relates to a CAN bus simulation monitoring method. Compared with the prior art, a CAN bus simulationmonitoring scheme designed by the invention utilizes the advantages of a hardware scheme and a logic architecture to improve the real-time performance of data transmission; in addition, the functionsof triggering and controlling data receiving and sending, setting timing time to complete data sending, shielding and receiving settable data and the like are added. The adaptability of a CAN bus indifferent industry applications is improved, and various use requirements are met.

The invention discloses a method and apparatus for multi-base station positioning. The method for multi-base station positioning includes the steps: setting an adjacent minimum calculation unit in each direction of each minimum calculation unit; after a first coordinate value is stabilized, acquiring the current minimum calculation unit by traversing according to the first coordinate value and a geometric ray method; calculating a second coordinate value of the current minimum calculation unit for at least M times, and if the difference between the second coordinate values is within a preset first threshold, acquiring an average value of coordinates corresponding to the second coordinate value; and taking the average value of the coordinates as a static coordinate value of a positioning tag, and using a map-nested data structure to quickly find the positioning tag according to a key value Key and move the positioning tag to the next minimum unit. The effect of positioning of multiple base stations in a large range is relatively poor in practical applications. In practice, a base station grouping tracking large-range positioning algorithm is explored, which can effectively improve defects of low large-range positioning accuracy and inaccurate positioning, thereby achieving a wide range of accurate positioning effect.

The invention relates to the technical field of liquid crystal panel detection, and provides a liquid crystal panel detection device and method. The liquid crystal panel detection device comprises a workbench, a driving mechanism, a pressure applying assembly, a camera and an upper computer. The workbench is used for placing a liquid crystal panel; the driving mechanism is mounted on the workbench; the pressure applying assembly comprises a bearing piece installed on the driving mechanism, a pressure applying piece which can be movably borne on the bearing piece up and down, and a contact sensing unit arranged between the bearing piece and the pressure applying piece, wherein the pressing piece is driven by the driving mechanism to abut against or be separated from the liquid crystal display panel; the camera is suspended above the liquid crystal display panel; and the driving mechanism, the contact sensing unit and the camera are electrically connected with the upper computer. High accuracy can be achieved when the liquid crystal display panel detection device is used for detecting the quality of the liquid crystal display panel, and an automatic detection mode is adopted, so thatthe detection efficiency is high.

The invention discloses a ZNBASE distributed database clock synchronization method and system, belongs to the technical field of high-precision time synchronization of ZNBASE distributed databases, and aims to solve the technical problem of how to improve the time synchronization precision so as to improve the read-write concurrency of a cloud native NewSQL database and improve the time synchronization efficiency. According to the technical scheme, a technology based on Beidou satellite time service and PTP time synchronization is used, time service is carried out on a satellite receiving client side, time synchronization is carried out on a PTP server through a network cable, time synchronization is carried out on a service server and the PTP server, and ZNBASE distributed database clock synchronization is achieved.

The invention particularly relates to a seismic exploration system and a processing method of acquired data thereof. In the aspect of time synchronization, the whole seismic data is marked in real time by using a TCXO crystal oscillator with low power supply voltage and high reliability, the accuracy only depends on the GPS precision and the clock period of a data acquisition system, and the stability is not weakened along with the change of the working time and space of an acquisition node. In the aspect of positioning, a satellite clock error, a receiver clock error, an ionosphere delay error and a troposphere delay error are weakened by using a carrier phase and pseudo-range observation double-difference combination method, random interference is eliminated by using a Kalman filtering algorithm, the positioning precision is improved, and the method can be used for a high-density seismic exploration array.