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

The invention discloses a large generator based local discharge ultrasonic distribution characteristic sensor setting analysis method, which comprises the following steps of: constructing a large generator model; performing simulative calculation on sound field distribution of a single bar of a generator winding in air and sound field distribution of the single bar in oil; constructing a model of a generator stator and performing simulative calculation on sound field distribution of local discharge of a stator winding in the entire generator stator; performing simulative analysis on propagation of an ultrasonic direct incidence signal in the stator model by using a transient state model; solving out angle range of direct incidence ultrasound and calculating sound pressure distribution condition on the outer wall of the stator; and obtaining a sensor distribution rule for effectively acquiring the direct incidence ultrasonic signal. The method breaks through the conventional large-container monitoring method for the large generator local discharge; and by using the method, the ultrasonic distribution characteristic of the local discharge in the generator is conveniently and effectively displayed; effective reference is provided for rational arrangement of an ultrasonic sensor; and meanwhile, an idea is provided for the positioning a local discharge point.

The invention discloses a method for simulating communication between nodes. A virtual concentrator which can simulate the function of a concentrator to send operation commands and collect operation results is provided. A hardware simulator for simulating a communication node of a power carrier communication network is provided, and is controlled by an upper module of the hardware simulator. A plurality of virtual data acquisition terminals capable of simulating the functions of the data acquisition terminals to generate messages and the functions of sending and receiving messages are set. A control unit for configuring the hardware simulator, the virtual concentrator and the virtual data acquisition terminal is set. The control unit configures the virtual concentrator, the hardware simulator and the virtual data acquisition terminal so as to be connected into an analog power carrier communication network. The virtual concentrator, the hardware simulator and the virtual data acquisition terminal are made to simulate the communication behavior in the power carrier communication network according to their respective scripts.

The invention discloses an intelligent building air conditioning system. The air conditioning system comprises a central controller, a logistics service unit and multiple distribution control nodes which are connected with one another through a local area network; the multiple distribution control nodes are adopted for controlling air conditioning system bodies in all areas respectively, so that energy is saved, and pressure of the central controller is reduced; the central controller mainly provides a data transmission channel, the data uploaded by the distribution control nodes are acquiredto be stored, so that the time delay difference is reduced; and the central controller outputs the data to the logistics service unit, then an information sending module is used for sending received alarm announcement information and address code information to a logistics service end through a wireless network so that logistics service personnel can check received alarm information and the alarmaddress and conduct troubleshooting in time, and the living life of people is not influenced.

The invention relates to a video testing method based on deep packet inspection. The video testing method based on deep packet inspection is used for displaying videos on mobile terminals and acquiring the video playback process through data packets. The video testing method based on deep packet inspection includes the following procedures of (1) controlling the terminal to play the video to be tested through automatic tools, (2) fetching data communication packets, (3) judging whether the data communication packets are video streaming data packets or not, (4) analyzing whether the video streaming data packets are recognizable video streaming or not through judging on the video data type, and (5) testing and analyzing on the recognized video streaming. The video testing method based on deep packet inspection can reduce time-lag and test the effect of video playback.

The invention belongs to the technical field of CAN bus communication engineering, and particularly relates to a CAN bus simulation monitoring system. Compared with the prior art, the CAN bus simulation monitoring 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 functions of 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 the CAN busin different industry applications is improved, and various use requirements are met.

The invention discloses an unmanned aerial vehicle millimeter wave communication beam tracking method. A time slot structure of unmanned aerial vehicle millimeter wave communication is designed into an exchange time slot and T tracking time slots, and the process in the exchange time slot comprises receiving MSI feedback; Calculating an actual beamforming vector according to the actual position and attitude information of the receiving-end unmanned aerial vehicle in MSI feedback, and predicting the position and attitude information of the receiving-end unmanned aerial vehicle in T tracking time slots in the future; Transmitting information through the actual beamforming vector, Wherein the process in the tracking time slot comprises the steps of calculating a predicted beam forming vectoraccording to a predicted position and attitude information; And transmitting information through the prediction beam forming vector. The position and the posture of the unmanned aerial vehicle are effectively tracked, the millimeter wave communication spectrum efficiency of the unmanned aerial vehicle can be improved under the condition that the unmanned aerial vehicle rapidly moves, channel stateinformation feedback of pilot frequency and a receiving end is not needed, and the time delay error difference between the unmanned aerial vehicle and the real motion state can be reduced.

The embodiment of the present application provides a synchronization signal control method and a device, which are applied to a synchronization control terminal communicatively connected with each positioning base station. The present application generates a clock signal by controlling the isothermal crystal oscillator, and extracting a first trigger signal after a first clock cycle and a second trigger signal after a second clock cycle of the clock signal, wherein the second clock cycle is the next clock cycle of the first clock cycle, and then a time interval between the first trigger signaland the second trigger signal is calculated, and a transmission time interval of a corresponding synchronization signal transmitted to each positioning base station is adjusted based on the time interval. Therefore, by strictly controlling the interval time of each clock signal and strictly controlling the transmission time interval of the transmitted synchronization signal, the application can effectively reduce the delay error existing in the clock synchronization process between each positioning base station and the synchronization controller, achieve accurate synchronization, and make thepositioning work more stable.

The invention discloses a delay measurement method, device and system of a direct current transmission system. According to the topology of the direct current transmission system, the delay of the entire link is divided into four parts: IO interface link delay, pole control link Delay, valve control link delay, sub-module execution link delay. The delay of each part of the link can be tested independently from the time it receives the signal to the time it sends the signal to the lower system. The start and end signals of the delay test are connected to the delay measurement device to ensure the measurement consistency. Through the test of the overall and partial link delay of the DC transmission system, it plays a vital role in the optimization of the subsequent delay and the compensation of the control.

The invention relates to a system and a method for realizing multi-channel signal analysis synchronization and time delay adjustment. The system comprises a plurality of radio frequency channel units, a plurality of base band processing units, a plurality of data storage units and a precision synchronization unit, wherein the radio frequency channel units respectively correspond to channels; each radio frequency channel unit is used for converting a radio frequency input signal of the corresponding channel into an intermediate frequency signal with a fixed frequency and carrying out digital conversion; the base band processing units respectively correspond to the channels; each base band processing unit is used for carrying out digital signal demodulation, compensation of group delay and time delay error adjustment among the channels on an output signal of the corresponding radio frequency channel unit; the data storage units respectively correspond to the channels; the precision synchronization unit is used for carrying out time delay control on signals of the base band processing units. The system and the method for realizing multi-channel signal analysis synchronization and time delay adjustment, which adopt the structure, realize the requirement for synchronization of multi-channel testing on single equipment, improve the confidence level of multi-channel signal analysis, reduce hardware complexity and have a wider application range.

The invention provides a clock signal producing circuit. The clock signal producing circuit comprises a small signal amplification unit, a delay unit and a level shifting unit. The small signal amplification unit comprises a first input end for inputting a threshold voltage, a second input end for inputting an oscillation voltage, a first output end for outputting a first differential signal, and a second output end for outputting a second differential signal. The delay unit comprises a third input end connected with the first output end, a fourth input end connected with the second output end, a third output end for outputting the oscillation voltage to the second input end, and a capacitor with one end connected with the third output end. The level shifting unit comprises a fifth input end connected with the first output end, a sixth input end connected with the second output end, a fourth output end for outputting the threshold voltage to the first input end, and a fifth output end for outputting a clock signal. Through adoption of the clock signal producing circuit, the problem of excessive delay error of the clock signal producing circuit in the prior art is solved.

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 an array substrate and a display panel. The display panel comprises a display area, an opening area, a plurality of first scanning lines, a plurality of second scanning lines, a plurality of third scanning lines, a plurality of first shifting register units, a plurality of second shifting register units and a compensation unit. The first scanning lines pass through the display area along a first direction; the second scanning lines extend to the opening area in the first direction; the third scanning lines extend to the opening area along a second direction; the output ends of the first shifting register units are connected with the corresponding first scanning lines and second scanning lines respectively, and the output ends of the second shifting register units are connected with the corresponding third scanning lines. The first scanning lines penetrate through the display area to be connected with the second shifting register units, and the compensation unit is connected into a scanning signal loop composed of a second clock signal line, the second shifting register units and the third scanning lines. According to the embodiment of the invention, the capacitance difference of the wires on the two sides of the display area can be compensated, and the delay difference of scanning signals is reduced.

This patent discloses a system for simulating communication between nodes, including a control unit, a virtual concentrator, a hardware simulator and a virtual data collection terminal; the control unit is connected to the virtual concentrator, hardware simulator and virtual data collection terminal respectively One-to-one connection; 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 that the concentrator sends operation commands and receives operation results; The hardware simulator, It can simulate the message sending and receiving function of a certain communication node of the power carrier communication network, and is controlled by the upper layer module; the virtual data acquisition terminal can simulate the function of the data acquisition terminal to generate messages and the function of message sending and receiving; The control unit is used to configure the hardware simulator, the virtual concentrator and the virtual data collection terminal; and connect the hardware simulator and the virtual data collection terminal into a simulated power carrier communication network.