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29693results about How to "Improve anti-interference ability" patented technology

Intelligent substation based on sensor, communication network and expert system

The invention discloses an intelligent substation based on sensors, a communication network and an expert system. The intelligent substation comprises a substation automation system, a primary equipment condition monitoring system and an intelligent auxiliary control system. The intelligent substation is characterized in that the real-time data of equipment operation are acquired by additionally installing various sensors, the IEC61850 standard is utilized to realize information modeling of the sensor data, a communication network is utilized to build a physical channel for information transmission, and advanced application of the substation automation system and intelligent monitoring and linkage of the primary equipment condition monitoring and auxiliary systems are realized by a background expert system, thus realizing intelligent operation and patrol functions of the substation; the sensors include an all-fiber electronic current transformer, a capacitive voltage divider type electronic voltage transformer, a primary equipment condition monitoring sensor and an internet sensor with an auxiliary system things; and the advanced application of the substation automation system includes sequential control, equipment condition visualization, intelligent alarm, distributed condition estimation, substitution function and the like. Intelligent operation and patrol functions of the substation can be realized.

Optical fingerprint detection device and display equipment

An embodiment of the invention provides an optical fingerprint detection device and display equipment. The optical fingerprint detection device includes a light source, a touch panel and a detection device. The touch panel has a first surface and at least one second surface adjacent to the first surface, the first surface is provided with at least one touch area, the second surface is used for receiving a light beam emitted from a light source and forms an included angle of smaller than 90 degrees with the first surface, so as to guide the light beam which enters the touch panel through the second surface towards the touch area of the first surface, and the touch area is such arranged that when the touch area is not touched by a finger or a toe, one side of the light beam, which is towards the touch panel and opposite to the first surface, is totally reflected; and the detection device is located outside one side of the touch panel which is opposite to the first surface, and is used for receiving the light beam reflected by the touch area and emitted from the touch panel and detecting intensity distribution of the received light beam.

Auto-disturbance-rejection automatic flight control method for four-rotor aircraft

InactiveCN102830622ABuild precision is not highImprove anti-interference abilityAdaptive controlEnvironmental diversityAutomatic control
The invention relates to a method for autonomous flight of a four-rotor unmanned aircraft by using an auto-disturbance-rejection control technique, belonging to the automatic control field of unmanned aircraft. The method comprises the steps of: respectively making differences between an output xld after arranging a transient process of a target value and an output of an extended state observer, and differential of the output xld and the output of the extended state observer respectively, and then carrying out nonlinear conversion on two differences to obtain a nonlinear feedback control law u0; with regard to an auto-disturbance-rejection controller with three attitude angles and vertical displacement, making difference with feedback of the extended state observer to obtain an output as an input of a corresponding channel of a four-rotor system and the extended state observer; and with regard to an auto-disturbance-rejection controller with forward and side displacements, directly using u0 as the input of the corresponding channel of the four-rotor system and the extended state observer, and feeding back the actual value to the extended state observer after the corresponding channel of the four-rotor system responses, so as to form an close-loop auto-disturbance-rejection controller. The method is strong in capacity of resisting disturbance, and the problems of difficulty in modeling of the four-rotor system, environmental diversity in the flight process, and frequent interferences are effectively solved.

Transformer substation electrical equipment comprehensive physical examination system based on cloud side end collaborative perception

The invention relates to a transformer substation electrical equipment monitoring, analyzing and processing system and particularly relates to a transformer substation electrical equipment comprehensive physical examination system based on cloud side end collaborative perception. The system is characterized in that multi-node detection and unified perception access are realized through an integrated communication network architecture on the edge side of a station end, an intelligent sensing terminal is comprehensively covered in real time. Meanwhile, local intelligent data processing is realized by utilizing an edge computing technology; an omnibearing intelligent diagnosis and analysis system of the transformer substation is constructed at a cloud end, and multiple functions such as abnormal real-time early warning and intelligent sensing prediction are realized, so that the real-time tracking of the operation state of the power equipment of the transformer substation is realized. Themethod has the advantages that the transformer substation can be covered, monitoring data can be comprehensively utilized, an intelligent processing scheme can be provided, construction of the intelligent transformer substation is promoted, and the intelligent evaluation and safety early warning level of the electrical equipment state of the transformer substation is improved.

Automotive anti-collision radar multi-target detecting method and system

The invention provides an automotive anti-collision radar multi-target detecting method and system. The method comprises the steps of emitting two types of triangular waves with different modulation periods in an alternating mode and acquiring echo data, carrying out windowing processing, carrying out distance dimension FFT and speed dimension FFT, carrying out modulo processing to obtain frequency spectrum of two types of echo waves, carrying out target paring to obtain a spectral line of the same target of the two echo waves, calculating distance and speed of each target, and judging target distance and speed obtained by the two echo waves through a tolerance function to obtain a final target. A radio frequency emitting and receiving part of the system comprises a radar sensor and an intermediate frequency processing module, and a data processing part comprises a modulus, a modulus converting module and a central control processing module FPGA. The FPGA comprises a modulation signal producing sub-module, an echo wave signal acquisition sub-module, an algorithm sub-module and a control sub-module. The modulation waves and corresponding algorithms effectively remove false targets and improve accuracy that multiple moving targets are detected under strong noise. A hardware system is simplified in structure and easy to achieve.

Method for tracking small target with high precision under complex background and low signal-to-noise ratio

The invention provides a method for tracking a small target with high precision under a complex background and a low signal-to-noise ratio (SNR). The method comprises pre-treating an image under the complex background and low SNR, portioning and extracting the target based on a target adaptive threshold of the binomial distribution judgment rule, adopting a curve fitting algorithm based on Kalmanfilter thinking improvement to carry out motion prediction on the target, using data fusion of infrared and visible light transducers to improve detection probability of the target and reduce false-alarm probability, and when the shape of the target alters, using a shape of which edge characteristics are normalized to identify and seek characteristic invariables so as to achieve precise tracking of the target.

Millimeter-wave time-division linear frequency modulation multiple-target detection colliding-proof radar for car

The invention relates to the technical field of radio fix radars, in particular to a millimetre wave time-division linear frequency modulation multi-object detection automobile anti-collision radar. The radar of the invention adopts full phase parameter receiving / emitting benchmark signal and time-division and time-sequence asynchronous control to receive / emit a dual-purpose quasi-light integrated medium lens antenna array, and scans the objects possible to be collided on the warning road surfaces by DSP according to lane scanning wave beam; the road situation photographing combined with the vehicle speed and GPS data MCU to control time-division n-passage modulation frequency and waveform millimetre wave linear locking phase frequency modulation; emission is carried out sequentially by R / T2, a circulator, a wave beam switch and the antenna array; echo passes through the antenna array, the wave beam switch, the circulator, the R / T1, low noise high amplifier, subharmonic mixing, middle amplifier and a time-dividing circuit and multi-object signal corresponding matching filter wave and is processed and controlled by MCU at DSP; when a plurality of road barriers are encountered, the orientation, distance and relative speed are determined by DSP restriction virtual warning; three-dimensional images are displayed by a CRT; the closer the distance of the object is, the higher the resolution is; the object which is closest to the vehicle is recognised; sound and light alarm are carried out when the distance is less than safety distance; when the distance is near to the dangerous distance, the vehicle can intelligently avoid the barrier or reduce the speed or brake; the radar of the invention can make a choice according to the control reference road situation, the vehicle speed and the GPS data, thus obviously improving the driving safety of the vehicle.

Multi-module and multi-target accurate tracking apparatus and method thereof

The invention provides a multi-mode and multi-target precise tracking device and the method, wherein, a digital servo-platform is used as the support platform; a CCD video camera and an infrared sensor are arranged on the digital servo-platform for receiving image information; the received image information is processed through a comprehensive information process platform for obtaining the tracking information of the target; the tracking information is compressed and transmitted to a control center through a transmission equipment for monitoring. The means that acquiring the target tracking information from the image information is the core of detecting and tracking weak and small targets in complicated background. The method divides and selects the targets through target adaptive threshold based on the binomial distribution judgment rule after pre-processed the image under low signal-to-noise ratio, and then improves the detecting probability of the target and reduces the false alarm probability through data fusion of infrared sensor and visible light sensor, and finally detects and estimates the movement of the selected target to acquire the tracking information of the target. When the target shape is changed, the feature invariant is searched through shape identification of edge feature normalization to realize precise tracking to the target.

Methods and apparatus for a navigation system with reduced susceptibility to interference and jamming

A navigation system provides a significant level of protection against all forms of interference or jamming to GPS in a cost-effective way. The system employs a network of ground reference stations and Low Earth Orbiting (LEO) satellites in conjunction with GPS. A common-view ranging geometry to a GPS satellite is established that links a reference station and a user. A second common-view geometry to a LEO satellite between the same reference station and user pair is also established. The ground stations synthesize real-time aiding signals by making carrier phase measurements of GPS the LEO satellite signals. This aiding information is transmitted via the LEO satellites to the user receiver at high power to penetrate ambient jamming. The user receiver locks onto the carrier phase of the LEO satellite, demodulates the aiding information, then applies the carrier phase measurements and the aiding information to enable extended coherent measurements of the GPS signals. The system thereby recovers the GPS signals that would otherwise be lost to the jamming.

Method for detecting arc faults based on time-frequency characteristics of high-frequency current component

The invention discloses a method for detecting arc faults based on the time-frequency characteristics of high-frequency current component. The method comprises the following steps: measuring the transient high-frequency current in a primary loop by using a self-integrating Rogowski coil and performing the spectrum analysis of the high-frequency current; measuring the time difference between the zero-crossing time of a power-frequency current and the time that the signal of the transient high-frequency current appears by adopting a counting method via using an interrupt trigger and a timer / counter, so as to confirm the phase angle position where the high-frequency current occurs in the protected loop load current; and judging whether an arc fault is caused or not according to the spectrum characteristics of the high-frequency current, the phase angle position where the high-frequency current signal occurs and regularity of the signal of the high-frequency current. The invention is capable of detecting arc faults in the normal power supply, is limited by installation position slightly, can distinguish the transient current generated by normally connecting / disconnecting a circuit from the power electronic-load current of the switch power supply and the like, and reduces and avoids misoperation.

Digital cluster communication method with the control channel frequency hopping function

The invention relates to one digital integral communication method with control signal channel jump frequency function, which comprises integral group mode and direct mode, wherein, the former is to store information base devices divided into single base station module and multi-base module; the latter one is to store information basic device with mobile bench work mode; the jump frequency comprises control signal jump frequency and business signal jump frequency by use of TDMA system, wherein, the Nts hour gap to form one frame hollow one to form one frame.

Method and device for personal location based on motion measurement information

The invention discloses a method and a device for personal location based on motion measurement information. The invention calculates motion distance and direction and finally determines the current location of an operational staff by measuring the motion state of the operational staff and according to motion types and motion models; and at the same time, the invention combines the motion models with a GPS so as to use the GPS to revise location errors and model parameter errors. The invention overcomes the defect that the traditional navigation locator can not realize location when the GPS signals are deficient and has higher location accuracy. The device of the invention has the technical characteristics of being light and portable and having strong anti-interference performance, higher reliability and higher accuracy.

Positioning device and positioning method for fault detection of local discharge

The invention discloses a positioning device and a positioning method for fault detection of local discharge, and the positioning device comprises two sensors, a local discharge detection positionfinder and a computer, wherein, the two sensors consist of an electromagnetic sensor and a resonant ultrasonic sensor; the local discharge detection positionfinder is internally provided with double-signal paths in parallel; the positioning device also comprises a data acquisition card and a liquid crystal display (LCD) which are connected with the output ends of the double-signal paths; one path of the double-signal paths is an electromagnetic path connected with a peripheral electromagnetic sensor, while the other path thereof is an ultrasonic channel connected with a peripheral resonant ultrasonic sensor; one path is displayed by the LCD connected with the acquisition card, and the other path is sent to a peripheral computer through data wires after signal received by the electromagnetic path and the ultrasonic path is processed by the acquisition card. The test method is simple and flexible, has easy operation and strong anti-interference performance, overcomes the defect of single detection method for local discharge in the prior art, and can realize accurate detection and position on local discharge fault points in power equipment.

Intelligent household electric appliance system based on ZigBee and page generation and implementation method thereof

The invention provides an intelligent household electric appliance system based on ZigBee and page generation and an implementation method thereof, wherein the system comprises a computer, an embedded Web gateway and a plurality of terminal devices. The embedded Web gateway comprises an ARM (Advanced RISC Machine) microprocessor, a Flash SDRAM (synchronous dynamic random access memory), a time circuit, a power circuit, a network card interface and a ZigBee coordinator module, wherein the automatic generation of the household electric appliance control page is achieved based on the embedded Web server. The ZigBee coordinator module is wirelessly connected with the terminal devices via a ZigBee protocol for transmitting operation instructions and uploading the date of the terminal devices. The terminal devices receive the gateway instructions, execute the control instructions and unload the operation state of the devices and the environment parameter data. The computer remotely accesses the embedded Web gateway via the internet so as to obtain the household electric appliance control page, to manage the names of the terminal devices and to check and control the operation state of the devices and the environment parameter.
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