273results about How to "Guaranteed anti-interference ability" patented technology

The invention provides a dual wavelength common-channel quadrature carrier frequency digital holographic detection apparatus and a detection method. A non-polarization splitting prism splits converged dual wavelength incident light into reflected reference light and transmitted object light; the reference light irradiates an aperture reflector and is reflected; the object light is split into dual wavelength object lights when passing through a dichroscope; the dual wavelength object lights separately irradiate a first reflector and a second reflector and are reflected and passes through the dichroscope to merge into a beam of object light; The reflected reference light and object light are combined by a non-polarization splitting prism into a beam of light which passes through a second lens to form a quadrature carrier frequency hologram which is collected by a computer via an image sensor and the phase of the object to be measured is calculated. The detection method ensures the anti-interference ability and wrap-free real-time detection; and the method is simple and is easily implemented without need of any optical members such as polarization elements and space filter arrays, and only the hologram recorded by a black-white image sensor and completion of the dual-wavelength hologram separation by a simple algorithm are needed.

The invention relates to a robust fuzzy predictive fault-tolerant control method for an interval time-varying-delaying system. The robust fuzzy predictive fault-tolerant control method includes the following steps that firstly, a T-S fuzzy model of a nonlinear system is constructed; secondly, the constructed T-S fuzzy model is converted into an expanded T-S fuzzy model; thirdly, according to the constructed expanded T-S fuzzy model, a fault-tolerant controller that satisfies a control law is designed; and fourthly, a gain of the fault-tolerant controller is solved in a form of linear matrix inequality and the robust fuzzy predictive fault-tolerant control law is calculated. According to the robust fuzzy predictive fault-tolerant control method for the interval time-varying-delaying system,the robust fuzzy predictive fault-tolerant control method with time-delay dependence is provided according to the fact that a type of the industrial process has the characteristics such as nonlinearity, uncertainty, unknown disturbance, interval time-varying-delaying and partial actuator failure, thus the industrial process operates more smoothly and efficiently, the performance of a system is improved, and the fault tolerance of the system is increased.

The invention discloses an experimental system for the determination of white rat behavior, which is composed of two parts including a hardware device and a white rat video tracking determination system consisting of system hardware and system software, the hardware device comprises a box body, an animal movement case arranged within the box body, an illumination device arranged on the top of the box body and an outdoor air system connected with the box body; the system hardware comprises a video input unit, an image acquisition card and a computer, wherein, the video input unit is connected with the computer via a video line and is arranged on the top of the box body, the image acquisition card and the system software are installed on the computer, the system software comprises the following modules: image acquisition, trace tracking, background modeling, computation of characteristic data, and formatted display and storage of result. The experimental system implements the acquisition of behavior data of the white rat on conditions of low noise and low illumination, causing no disturbance for normal activity of the white rat and improving accuracy of experimental result; the invention, in combination with the white rat video tracking determination system, performs the determination flexibly and results from diversified test parameters.

The invention relates to a space-time array antenna anti-interference method in satellite navigation equipment, in particular to a novel space-time joint anti-interference method. The space-time joint anti-interference method comprises the following steps of restraining narrow-band interference in a navigation signal direction through the improved frequency domain narrow-band interference filter-out technology and achieving iteration solution of space-time array weight in combination with minimum variable step size mean square error to reduce the algorithm complexity of the method. The space-time array antenna anti-interference method in the satellite navigation equipment can restrain interference in the navigation signal direction, is low in algorithm complexity, simple in achievement and particularly suitable for application of future mini-sized high-dynamic anti-interference terminals.

A temperature control system comprises a plurality of distributed heat sources and a plurality of temperature sensors. Each heat source is connected with a respective power drive module, all power drive modules are controlled by a temperature controller, and a temperature control system takes a target temperature as reference input and output temperatures of the temperature sensors as feedback; tracking errors between the reference input and the output temperatures are input in the temperature controller, and the temperature controller converts the tracking errors into average errors, obtains error deviations between the average control quantity and the tracking errors and the average errors through calculation according to the average errors, obtains the superposition control quantity of each heat source according to the average errors and takes sum signals of the average control quantity and the superposition control quantities as the final output of the temperature controller. The temperature control system has the advantages of being low in dependence on single channels, high in anti-interference capacity and capable of performing uniformity control on temperatures of temperature boxes with distributed heat sources.

The invention consists of an analog quantity collecting circuit, a central process circuit, a relay output circuit, an external port and a display circuit. Wherein, the analog quantity collecting circuit comprises a primary side external current transformer, a voltage transformer whose two ends at secondary side is connected to a sampling resistor, a low-pass filter circuit passing by voltage of sampling resistor, and an positive input end of operational amplifier. The operational amplifier adopts voltage tracing method, and its output is connected to the AD input of CPU in central processing circuit. The output of switching value of CPU is connected to the controlled end of short circuit relay at primary side through photoelectrical coupler.

The invention relates to a method for realizing off-line reading files in an SAN (Storage Area Networking) shared file system. The method comprises the steps of opening a file, obtaining metadata, reading the file and ending file-reading, wherein the step of obtaining the metadata comprises a sub-step of detecting whether an original record exists, a sub-step of detecting the metadata validation, a sub-step of opening up a storage space; a sub-step of selecting and processing and a sub-step of obtaining all the metadata. In the invention, the fact that a client side also keeps a metadata backup locally is used, and the accordance and effectiveness of the metadata are guaranteed through a synchronized method, therefore, when a metadata server or an LAN (local area network) breaks down, a client server can continue to read files normally according to the local metadata backup. The method in the invention is adopted to realize the function that the client server can also continue to read SAN shared files according to the local backup metadata after the metadata server stops working.

The invention discloses a DC leakage current detection and protection circuit and a detection and protection method. A detection circuit used for detecting a difference value between an output current and an input current of a DC power supply, a difference value signal amplification and comparison circuit, a relay interlocking and thyristor (SCR) control protection circuit and a DC leakage protection testing circuit are adopted. According to the DC leakage current detection and protection circuit and the detection and protection method, the leakage current is detected by adopting the method of measuring the sampling resistance drop difference value, so the anti-interference capability of the circuit is guaranteed; the voltage drop difference value is amplified through a differencing circuit formed by an operational amplifier, and a leakage protection control signal is outputted through a comparison circuit formed by a precise stabilized power supply TL431. When the leakage current exceeds the maximum allowable value, power supply of a load is cut off through a relay and a thyristor. The DC leakage current detection and protection circuit and the detection and protection method integrate the functions of DC leakage current detection and open circuit protection, and have the advantages of being high in precision and reliability, strong in anti-interference capability, easy to install, convenient to debug, and the like.

The invention relates to a multistage cyclic code shift keying modulation and demodulation method based on transform domain communication, and belongs to the field of wireless digital communication. The method comprises the steps that a transmitting end generates a normalized frequency-domain basis function, carries out inverse Fourier transform on the normalized frequency-domain basis function to generate a time-domain basis function, generates MCCSK sub-symbols according to the time-domain basis function, and transmits the sub-symbols after carrying out data modulation through the sub-symbols; a receiving end generates a time-domain basis function corresponding to the transmitting end, and carries out MCCSK data demodulation according to the time-domain basis function to obtain demodulated data. According to the method, the diversity of modulation symbols is improved through the combinatorial number method, the symbols generated by cyclic code shift of the basis function are superposed and combined to generate more expanded symbols, symbols with the large minimum average symbol space are selected to be combined and used for modulation, the data are demodulated at the demodulation end in a multistage demodulation mode, and therefore the quantity of information carried by a unit waveform is increased, and the bit error rate loss is effectively controlled.

The invention discloses a multi-level identification detection system for GNSS interference signals. The system comprises a radio frequency front-end module, a first-level detector, an acquiring and processing module, a second-level detector, a multi-channel tracking and processing module, a third-level detector, an interference determination module and a positioning and resolving module. The output ends of the first-level detector, the second-level detector and the third-level detector are respectively connected with the interference determination module. The invention further discloses a multi-level identification detection method for GNSS interference signals. Based on the system or the method, the influence characteristics of different interference signals on each link of the signal processing procedure of a receiver can be comprehensively analyzed, and interference feature parameters are extracted. The detection algorithm of each link is optimized and the detection accuracy is improved. Meanwhile, the detection is synchronously done during the received signal processing step, the baseband signal capturing step and the tracking step of a radio frequency front end. As a result, the real-time property, the rapidness and the low cost of the interference detection can be ensured.

The invention relates to a launching type disaster relief and fire extinguishing unmanned aerial vehicle. The launching type disaster relief and fire extinguishing unmanned aerial vehicle is characterized in that the launching type disaster relief and fire extinguishing unmanned aerial vehicle comprises an unmanned aerial vehicle body, a launching device, a visual aiming, visual navigation and sensing device, a broadband wireless transmission device and a ground teleoperation control device; encoding and decoding modules and signal transceiver antennas of the launching device, the visual aiming, visual navigation and sensing device and the broadband wireless transmission device are installed on the unmanned aerial vehicle body; the ground teleoperation control device is independent of the unmanned aerial vehicle body, transfers an operational order to an aircraft through a wireless signal, and receives and displays sensor information sent back by the unmanned aerial vehicle body; and a ground signal transceiver antenna of the broadband wireless transmission device is connected with the ground teleoperation control device. According to the launching type disaster relief and fire extinguishing unmanned aerial vehicle, by using the advantage that the unmanned aerial vehicle lifts vertically through teleoperation, the unmanned aerial vehicle can load the disaster relief goods or fire extinguishing bombs to fly to the scene of the disaster; and through an onboard aiming device and the launching device, the fire extinguishing bombs can be accurately thrown to achieve extinguishment, or the relief goods can be thrown to carry out the rescue.

The invention provides an entrance guard control method and system, equipment and a storage medium, relates to the technical field of automatic identification, and aims to solve the problem that the existing entrance guard system is difficult to realize non-contact, anti-interference, high-efficiency, accuracy and safety unification. The method comprises the following steps that a main processor performs identity recognition on a visitor by utilizing one or more modules in a face recognition module, a voiceprint recognition module and an iris recognition module according to a preset identity recognition mode, wherein the preset identity recognition mode is determined according to an entrance guard safety level and entrance guard efficiency; the main processor uses an infrared temperature measurement module to detect the body temperature of the visitor; and when the body temperature of the visitor is within a normal body temperature range and the visitor passes identity recognition, themain processor sends an unlocking signal to an entrance guard control unit to open the entrance guard.

The invention discloses an internal mold based frequency adaptive phase-locked loop modeling method, and relates to the technical field of signal processing. The method comprises the following steps that a synchronous rotating coordinate system phase-locked loop SRF-PLL model is constructed; a frequency adaptive filter IMAF is used, a positive, negative and zero sequence separated calculation module PNZSC extracts a positive sequence fundamental wave voltage of the power system, and a low pass filter module in the SRF-PLL model is replaced; and at the same time, a source decoupling-end normalized phase-locked loop SUN-FLL is used to provide estimated frequency for the frequency adaptive filter IMAF, and finally the IMAF-PLL model is obtained. The method has a good frequency selection effect and high stability, and the phase-locked loop is more robust to resist voltage fluctuation and frequency fluctuation.

The invention relates to a bombing-type disaster-relieving and fire-extinguishing unmanned aerial vehicle. The bombing-type disaster-relieving and fire-extinguishing unmanned aerial vehicle is characterized by comprising a unmanned aerial vehicle body, a bombing device, a visual aiming, visual navigating and sensing device, a broadband wireless transmission device and a ground teleoperation control device, wherein codec modules and signal transceiving antennae of the bombing device, the visual aiming, visual navigating and sensing device, the broadband wireless transmission device are mounted on the unmanned aerial vehicle body; the ground teleoperation control device is independent of the unmanned aerial vehicle body, transmits an operation instruction to an aircraft through wireless signal transmission, and receives and displays sensor information sent back by the unmanned aerial vehicle; a ground signal transceiving antenna of the broadband wireless transmission device is connected with the ground teleoperation control device. The bombing-type disaster-relieving and fire-extinguishing unmanned aerial vehicle provided by the invention loads disaster-relieving supplies or fire-extinguishing bombs to a disaster site by virtue of advantages of a teleoperated vertical-takeoff and landing unmanned aerial vehicle, and accurately throws the fire-extinguishing bombs to achieve fire extinguishment or throws the disaster-relieving supplies to carry out disaster relief through an airborne aiming device and the airborne bombing device.

The invention provides an orthogonal double-grating based detecting device for synchronous phase shift common-light path interference and a detecting method for the orthogonal double-grating based detecting device, belonging to the field of the detection of optical interference. The invention aims at solving the problem that the existing optical phase shift interference detecting method is complex and hard to operate, and is high in cost and low in measurement precision caused by a high-quality lambda/4 wave plate. The invention has the scheme that a light beam emitted out of a light source is incident into a light receiving surface of a collimating and beam expanding system through a polarizing film, an emergent light beam collimated and expanded by the collimating and beam expanding system is incident into a first lens through two lambda/4 wave plates, an object to be tested and a rectangular window opening, an emergent light beam collected by the first lens is incident into a second lens through the double gratings formed by a one-dimensional cyclic range grating and a one-dimensional cyclic phase shift grating, a diffraction light beam transmitted by the second lens is incident into a four-quadrant polarizing film set, an emergent light beam of the four-quadrant polarizing film set is received by an imaging sensor, and an image signal output end of the imaging sensor is connected with an image input end of a computer, and obtains the phase distribution of the object to be tested.

The invention relates to a laser detection mechanism. A large bottom plate mechanism, a displayer mechanism and a keyboard mechanism are installed on a lower rack assembly. An electric control box assembly is fixedly arranged on the side edge of the large bottom plate mechanism. A marble platform is installed on the large bottom plate mechanism. The laser detection mechanism is fixedly arranged above the marble platform. The laser detection mechanism is composed of a gantry Y-axis mechanism, a gantry X-axis mechanism, a right gantry mechanism and a Z-axis mechanism assembly. The laser detection mechanism can be applied to an outside line size test of a mobile phone protective shell and is mainly used for testing the height difference, the length, the width, the height, the width and the like. An industrial personal computer is adopted as a PC control terminal, it is ensured that a host can work for a long time with no failure, marble is used as the reference test plane on the platform, the system stability is ensured, a servo motor is used for motion control, and the system stability and interference resistance can be better ensured due to the fact that the servo motor has the advantages of being high in response speed, stable in motion and long in service life.

The invention relates to the technical field of wiring connectors, and especially relates to a heavy-type connector capable of realizing wiring between an internal part and an external part of an electric shielding cabinet. The heavy-type connector comprises a plug and a socket. The plug is provided with a substrate. The substrate is fixed on a guide rail in an electric cabinet. The plug is internally provided with a male pin and a male end pin sleeve. The male end pin sleeve is provided with the pin. The rear end of the pin is connected with an electric wire. The rear end of the male end pin sleeve is connected with a shielding layer of a shielding wire. The socket is internally provided with a female plugging sleeve and a female end pin sleeve. The female end pin sleeve is provided with a female plugging sleeve. The rear end of the female plugging sleeve is connected with the electric wire. The rear end of the female end pin sleeve is connected with the shielding layer of the shielding wire. The plug and the socket are connected through a male plugging core frame and a female plugging core frame. According to the invention, the occupied space for the installation and the wiring of the heavy-type connector is small, the heavy-type connector male end pin sleeve and the female end pin sleeve (used for the shielding wire) are capable of improving the anti-interference capability of the shielding wire, the guide rail is utilized for installation, the connector is convenient to fix, and the dismounting is convenient.

The embodiment of the invention discloses a human serum creatinine content detecting reagent for resisting calcium dobesilate interference. The detection reagent comprises a first reagent, a second reagent and a third reagent, wherein the first reagent comprises sodium carbonate. The detection reagent is used for determining human serum creatinine based on an enzyme method, and besides, interference of calcium dobesilate drugs in serum can be avoided. The defect for detecting creatinine by a conventional enzyme method is overcome. The embodiment of the invention further provides a human serumcreatinine content detecting method for resisting calcium dobesilate interference.