258results about How to "Strong interference" patented technology

The present invention provides a method, system and apparatus for reflection-mode microscopic photoacoustic imaging using dark-field illumination that can be used to characterize a target within a tissue by focusing one or more laser pulses onto a surface of the tissue so as to penetrate the tissue and illuminate the target, receiving acoustic or pressure waves induced in the target by the one or more laser pulses using one or more ultrasonic transducers that are focused on the target and recording the received acoustic or pressure waves so that a characterization of the target can be obtained. The target characterization may include an image, a composition or a structure of the target. The one or more laser pulses are focused with an optical assembly of lenses and / or mirrors that expands and then converges the one or more laser pulses towards the focal point of the ultrasonic transducer.

A surgical instrument for creating and preparing a cavity in a bony intervertebral body is provided with asymmetrical cutting structures. These asymmetrical cutting structures selectively open a cavity which has a relatively large surface area in the vertical direction. In one embodiment, the cutting structure includes a shearing element that sweeps out a cutting arc that is larger than the instrument delivery area.

The invention belongs to the field of domestic security, environmental monitoring wireless alarming system, characterized in that it at least comprises a monitoring host computer, a base station, a GSM / GPRS modem and several intelligent nodes, where the intelligent nodes are used to detect indoor temperature, humidity, fire alarm, gas leakage and illegal invasion and are composed of sensor plate, microcontroller unit, radio frequency communication module and power supply module, the base station and the intelligent nodes intercommunicate any one of the three protocols of sMAC, IEEE 802.15.4 and ZigBee and the base station transmits the sampled data of the intelligent nodes to the monitoring host computer; and the monitoring host computer is installed with monitoring application software, and has defence setting and withdrawing switching button to control the base station, and also has phone number keying-in and modifying function and a fuction fo giving an alarm to users by phone short messages.

The invention relates to a face model training module, relative method, and a face real-time identify system, and method, wherein in the identification, first using face sample image, to supply one face model supporting vector machine to each user; via collecting the video image input by camera, searching and checking the face of image, and tracking and identifying the image; then automatically marking the organ character point of face, to pre-treat checked face; calculating the Gabor character of face image after pretreatment; selecting low-dimension character vector from high-dimension Gabor character; inputting the selected low-dimension character vector into face model, to process face recognition, to feedback similarity data of each face model; based on said similarity data, outputting final face identifying result. The invention can improve the right rate of face recognition identification.

The invention discloses a method for detecting zero crossing time, frequency and phase difference of power sinusoidal signals. In the method for detecting zero crossing time, by using the fundamental principle that a sinusoidal signal close to the zero crossing can be approximately equivalent to a linear signal, after a zero crossing position of a signal is worked out by rough calculation, a voltage amplitude close to the signal zero crossing is counted by the unary linear regression theory so as to acquire the zero crossing time of the sinusoidal signal. The method for detecting a frequency of a zero crossing point of a sinusoidal signal comprises the following steps of: obtaining a period value of each zero crossing point by carrying out the cumulative mean on each zero crossing point phase different of the obtained signal, and solving the reciprocal to obtain the signal frequency value. The method for detecting phase difference comprises the following step of calculating the phase difference between different signals by means of a zero crossing point phase value of each different signal. The invention is insensitive to the relative position of the zero crossing point of the actual signal, can realize higher detection accuracy in the digital detection system, has a strong suppression function to the noise of the signal source and the interference, and finally ensures the application of the method in a high-accuracy detection field.

The invention discloses a joint estimation method for synchronizing frames, frequencies and fine symbols for orthogonal frequency division multiplexing (OFDM). The method comprises the following steps: carrying out autocorrelation operations of small point length and big point length on base band data sequences at the receiving terminal in parallel; jointly determining the frame synchronization position in real time and in parallel according to the small point autocorrelation peak and the big point autocorrelation peak; computing integer frequency offset coarse estimation value and decimal fraction frequency offset coarse estimation value according to the small point autocorrelation peak and the big point autocorrelation peak; estimating the final frequency offset detection value from the integer frequency offset coarse estimation value and the decimal fraction frequency offset coarse estimation value with a frequency offset dereferencing decision device; carrying out frequency offset correction on the base band data sequences according to the estimated final frequency offset detection value; and carrying out cross-correlation on the corrected base band data sequences and the local data sequences and determining the accurate fine symbol synchronization position through the cross-correlation peak. The contradiction of complex system measure function hardware design in the traditional time-domain joint estimation systems is solved by using the method.

An electric field waveform of an optical signal is precisely measured with high time resolution. Particularly, determination of inter-symbol interference has been difficult. Output light from the laser source is divided into first and second portions. The first portion is modulated by an optical modulator. The second portion is delayed by a delay line for the same quantity of delay as that of the first portion. The first and second portions are fed to a phase diversity circuit to configure a homodyne interferometer. An optical input sampling oscilloscope stabilizes a variable optical phase shifter to set an optical phase at a particular point of time to a fixed value using a pattern sync signal as a reference. An optical input sampling oscilloscope repeatedly averages optical waveforms and a CPU conducts three-dimensional display of the optical electric field waveform from which noise has been removed.

A multiple-input-multiple-output radar waveform design method belongs to the radar communication technical field, and aims to provide a design method with lower related sidelobe and frequency spectrum inhibition depth, high efficiency, less consumption, high robustness, and excellent time frequency anti-interference performance; the method comprises the following steps: pre-evaluating an autocorrelation sidelobe inhibition fuzzy region according to a relative position between a strong scatterer and a to be measured object in a radar scene, thus forming a corresponding object function; analyzing MIMO radar waveform orthogonality constraint so as to form the object function satisfying the orthogonality constraint; pre-evaluating a frequency domain interference fuzzy frequency band zone according to scene prior information, thus forming the corresponding object function; forming a constant modulus phase coding waveform constrained condition; forming a loose alternative projection algorithm framework; solving a waveform design according to the loose alternative projection algorithm framework, thus providing three waveform optimization output modes. The loose alternative projection constant modulus waveform coding design enables the MIMO radar to have batter detection performance.

A system (10) for directly measuring the depth of a high aspect ratio etched feature on a wafer (80) that includes an etched surface (82) and a non-etched surface (84). The system (10) utilizes an infrared reflectometer (12) that in a preferred embodiment includes a swept laser (14), a fiber circulator (16), a photodetector (22) and a combination collimator (18) and an objective lens (20). From the objective lens (20) a focused incident light (23) is produced that is applied to the non-etched surface (84) of the wafer (80). From the wafer (80) is produced a reflected light (25) that is processed through the reflectometer (12) and applied to an ADC (24) where a corresponding digital data signal (29) is produced. The digital data signal (29) is applied to a computer (30) that, in combination with software (32), measures the depth of the etched feature that is then viewed on a display (34).

The invention discloses an image processing and mode recognition technology-based rice blast spore microscopic image recognition method, relates to the field of rice blast spore microscopic image recognition, and aims at solving the problems that the field detection is incorrect due to visual observation and judgment, a current experiment is huge in demand for samples and the traditional microscope spore counting needs plenty of time and is high in initial disaster situation finding difficulty. The method comprises the following steps: I, converting an original image into a grey-scale map; II, carrying out image enhancement processing on the grey-scale map; III, obtaining a binarization effect picture; IV, obtaining a denoising effect picture; I, obtaining a graph outline suspected to be rice blast spores; VI, recognizing a rice blast spore microscopic image, finally completing the recognition of the rice blast spores and counting the quantity of the rice blast spores. The image processing and mode recognition technology-based rice blast spore microscopic image recognition method is applied to the field of rice blast spore microscopic images.

The invention discloses a method for transmitting and receiving downlink control information, a serving node and a user equipment. The method comprises: determining, by a serving node of a interfered UE, a protected resource, wherein the protected resource is located in at least one of the followings: a physical resource corresponding to a USS in a PDCCH, a physical resource corresponding to an expanded CSS in the PDCCH, a physical resource corresponding to a USS in an E-PDCCH or a physical resource corresponding to a CSS of the E-PDCCH; transmitting, by the serving node, first downlink control information of an interfered cell on the protected resource, wherein the first downlink control information comprises scheduling information for scheduling a paging message and / or a SIB1 message of the interfered cell. The invention can reduce the interference to a system broadcast message, a paging message and the like in a heterogeneous network.

The invention relates to an optimized cesium-light-pump weak magnetic detection device. In the optimized cesium-light-pump weak magnetic detection device, a non-magnetic-effect thermostatic controller enables a cesium spectrum lamp and a cesium sample absorbing bulb to be in the constant-temperature steam state, a radio frequency source stimulates the cesium spectrum lamp to emit light, and the light is converted into left handed circular polarization light to illuminate the cesium sample absorbing bulb, and focused on a photoelectric detector through a convex lens; a magnetoresistive sensor magnetic measuring module assists in measuring the value of a geomagnetic field of the position where the device is located, the range of strength is judged through an embedded type processing terminal module, and a self-oscillation module is controlled in a segmentation mode; photomagnetic resonance signals of the cesium sample absorbing bulb are detected by a low-noise photoelectric conversion circuit and simulate a high-frequency coil on the cesium sample absorbing bulb after being amplified and dephased so as to constitute a self-oscillation circuit, and Larmor signals are output; a Larmor signal measuring module and a big-dipper / GPS locating module are used for accurately measuring the value of the geomagnetic field of the position where the device is located. According to the optimized cesium-light-pump weak magnetic detection device, by means of the method achieving auxiliary magnetic field measurement, subband control, accurate frequency measurement and dual-mode locating, detection accuracy and reliability of the device are guaranteed.

A technology for synchronously removing N and P from the city sewage features that the composite suspended living things system with active sludge and biomembrane is created in a batch of composite bioreactors, which in running by the sequence of anaerobic, aerobic and anoxic steps. Its advantages are short reaction flow, less consumption of carbon source, high effect and low cost.

The invention relates to a method for identifying a time-varying structure modal frequency based on a time frequency distribution map. The method comprises the following steps of: 1, acquiring structural dynamic response signals of an identified structure and setting sampling time and sampling frequency; 2, performing time frequency transformation on each response signal to obtain a time frequency distribution coefficient and drawing the time frequency distribution map; 3, writing the time frequency distribution coefficient into a corresponding energy distribution form and rearranging the coefficient as a column vector; 4, determining a time frequency distribution region corresponding to the response containing each-order time-varying modal frequency for identification according to the time frequency distribution map of each response; 5, extracting parts with the highest energy time frequency distribution corresponding to the each-order time-varying modal frequency from the time frequency distribution map by using proper time frequency window functions respectively; 6, estimating the each-order time-varying modal frequency by using a weighting nonlinear least square method; and 7, performing error analysis on the identification result. The method has the advantages of clear physical significance, simple and convenient use, high applicability and high anti-interference capability.

The invention relates to a side slope optical fiber Bragg optical grating multi-point displacement sensor and a using method of the side slope optical fiber Bragg optical grating multi-point displacement sensor and belongs to the field of photoelectron measuring technologies. The displacement sensor comprises an upper end flange plate, an upper end elastic protection ring sleeve, an upper end pull rod, an upper end displacement spring, a protection steel tube, an elastic steel disc, optical fiber Bragg optical gratings, a lower connection leading-out optical fiber, an upper connection leading-out optical fiber, a steel tube optical fiber leading-out hole, a lower end displacement spring, lower end pull rod, a lower end flange plate and a lower end elastic protection ring sleeve. According to the relational expression between the displacement value Delta Lambda Beta of the central wavelength of the optical fiber Bragg optical gratings adhering to the elastic steel disc and the displacement L of the sensor, the displacement changes, caused by the displacement of side slope hole soil layers or cracking of rock stratums, of the measuring position are calculated. According to different monitoring requirements, different numbers of displacement sensors can be connected in series to achieve multi-point displacement monitoring in side slope holes; the optical fiber Bragg optical gratings are adopted, so that the anti-electromagnetic interference capacity and the corrosion resistance capacity are high; the structure is simple, and operation is convenient.

A system (10) for directly measuring the depth of a high aspect ratio etched feature on a wafer (80) that includes an etched surface (82) and a non-etched surface (84). The system (10) utilizes an infrared reflectometer (12) that in a preferred embodiment includes a swept laser (14), a fiber circulator (16), a photodetector (22) and a combination collimator (18) and an objective lens (20). From the objective lens (20) a focused incident light (23) is produced that is applied to the non-etched surface (84) of the wafer (80). From the wafer (80) is produced a reflected light (25) that is processed through the reflectometer (12) and applied to an ADC (24) where a corresponding digital data signal (29) is produced. The digital data signal (29) is applied to a computer (30) that, in combination with software (32), measures the depth of the etched feature that is then viewed on a display (34).

The invention discloses a dielectric loss factor measurement method based on an equivalent model, belonging to the technical field of electrical equipment test. The method comprises the following steps: measuring a voltage signal and a current signal on equipment insulation to obtain signal frequency and subharmonic waves; and calculating the dielectric loss factor in that way that the insulation is equivalent to two models, namely parallel connection of a resistor and a capacitor and series connection of a resistor and a capacitor. By the method, the signal frequency fluctuation and the measurement error of the dielectric loss factor caused by the existence of the harmonic wave can be inhibited; and the method has strong anti-interfere capacity and high calculation accuracy.

The invention discloses a deep-sea working ROV (Remotely Operated Vehicle) propeller system. An ROV controller can generate a speed control instruction of six degrees of freedom according to the current motion state of an ROV; a communication unit adopts a TCP (Transmission Control Protocol) / IP (Internet Protocol) network communication mode and transmits the speed control instruction generated by the ROV controller to a thrust distribution unit; a propeller unit comprises four horizontal propellers and three vertical propellers; the thrust distribution unit decomposes the instruction according to the received speed control instruction, and the obtained thrust values of all the propellers are transmitted to a driving unit; the driving unit outputs corresponding voltage signals according to the received thrust values and transmits the voltage signals to a propeller proportional valve, and opening and closing of the propeller proportional valve is adjusted; a hydraulic unit transmits hydraulic oil to the propeller unit through the propeller proportional valve. The deep-sea working ROV propeller system can improve the execution capability and efficiency of a propelling system.

The invention provides a system and a method for controlling a speedless sensor of a permanent-magnet synchronous motor. The system comprises a motor body unit, an inverter unit, an SVPWM (space vector pulse width modulation) unit, a first comparator, a second comparator, a first PI (proportion and integration) controller, a second PI controller, a first coordinate conversion unit, a second coordinate conversion unit, a third coordinate conversion unit and a sliding mode extended Kalman filter. A sliding mode variable structure control law is embedded in an extended Kalman filter state equation and an output equation, a digital extended Kalman filter is finally acquired through linearization and discretization, and state evaluation of reference stator current and rotator rotating speed omega r is acquired through expanded Kalman recursion; control on the speedless sensor of a permanent-magnet synchronous motor control system is realized, and real-time updating of the reference stator current under d-q coordinates is realized. By the system and the method, control on the speedless sensor of a permanent-magnet synchronous motor can be effectively realized, high-frequency chattering generated by independently applying a sliding mode variable structure for controlling is inhibited, and accurate measurement on the speed and the position of a rotor of the motor is realized.

The invention discloses a navigation locating method, including the following steps: a digital terrestrial television launcher sends out digital television signals carrying navigation information; a user receiver receives a plurality pieces of navigation information sent by a plurality of digital terrestrial television launchers for pseudo-range measurement one by one; the user receiver carries out location according to the measured pseudo range and the corresponding digital terrestrial television launcher. The invention also discloses a combination locating method adopting the digital television signals and navigation satellite signals. The invention adopts the digital terrestrial television launcher to realize the navigation locating function independently or adopts both the digital terrestrial television launcher and a navigation satellite to realize the navigation locating function together in virtue of the digital terrestrial television broadcast standard signals carrying the navigation locating signals, which can resist stronger interruptions and even can complete the navigation locating function successfully indoors or when the satellite signal is shielded.

The invention discloses a fiber-optic gyroscope based on a single-mode single polarized photon crystal optical fiber. A broadband optical fiber light source emits polarized light; the polarized light enters a polarization-maintaining optical fiber coupler via a polarization-maintaining optical fiber; the polarized light is divided into two beams, wherein one beam enters a hollow head to be attenuated, and the other beam enters an optical phase modulator via a polarization-maintaining optical fiber; the light is divided into two beams by the optical phase modulator; the two beams of light are respectively output to two ends of a optical fiber sensitive ring via a single-mode single-polarization photonic crystal tail fiber in the optical phase modulator; the optical fiber sensitive ring is wound by a single-mode single-polarization photonic crystal optical fiber; the two beams of light are respectively spread clockwise and anticlockwise in the optical fiber sensitive ring; output light is returned back to the optical phase modulator to generate interference; interference light enters the polarization-maintaining optical fiber coupler to obtain an interference signal; and an optical detector detects the interference signal to obtain the rotation speed of the measurement system. According to the fiber-optic gyroscope disclosed by the invention, the polarization error of the fiber-optic gyroscope can be effectively reduced, the null shift of the fiber-optic gyroscope is reduced, and the mechanical performance and the temperature performance of the fiber-optic gyroscope are improved.

The present invention discloses a method for locating radio sensor network node based on overwide band. The present invention uses overwide band as the communication medium of radio sensor node, and receives radio signal intensity indicating value measured between two nodes by normal data package, and locates using the radio signal intensity indicating value between nodes directly by non-metric ruler technology. Wherein the locating arithmetic includes three stages: a stage of local relative coordinates image location with cluster as unit; a stage that local image unites to global relative coordinates image; a stage that exchanging the relative coordinates image to absolute coordinate image. The present invention combines a plurality advantages such as overwide band multipath-resisting and strong interfere capacity, good capture characteristics etc., and ensure the location is characterized in that low cost, high precision and good adaptability.

The invention relates to a broadband online measurement sensor for DC extra-high voltage corona current, which comprises an isolation electrode unit, a signal processing unit and a system power supply unit, wherein the isolation electrode unit comprises an insulated isolation sleeve, a hollow tubular long arm low-voltage electrode and a hollow tubular short arm high-voltage electrode, wherein two ends of the insulated isolation sleeve are respectively in security isolation connection with the high-voltage electrode and the low-voltage electrode in a special way; the signal processing unit consists of a sampling resistor module, a signal acquisition module, a signal conversion module and a signal transmission module; the system power supply unit comprises a storage battery pack and a charging module; and the signal processing unit and the system power supply unit are arranged in the isolation electrode unit, so that the high-accuracy integral measurement sensor can be formed. The broadband online measurement sensor solves the problems of shielding disturbance of a strong electric field between an acquired signal and an acquisition channel as well as surrounding stray capacitance, and realizes the broadband domain online measurement and the multi-point network online measurement of the DC extra-high voltage corona current.

The present invention relates to a fuzzy clustering analysis-based power distribution network fault line selection method. According to the method, the ratio of the variation quantity of the active component of the zero-sequence current of each outgoing line of a power distribution network to the total variation quantity of the active component of the zero-sequence current of the outgoing lines of the power distribution network is calculated; the simulation model of the actual operation of the power distribution network is constructed; and a fault line is determined through using a clustering analysis method. When a single-phase grounding fault occurs on the arc suppression coil grounding system of a neutral point, fault characteristics are not obvious; the grounding mode of the neutral point in the power distribution network is changed, fault signals are amplified, and therefore, line selection accuracy can be improved; a bus-bar potential transformer PT and a current transformer CT are adopted to measure the zero-sequence voltage of a bus-bar and the zero-sequence current of the outgoing lines before and after a resistor is switched; the variation quantity of the active component of the zero-sequence current of each outgoing line of lines is monitored; errors brought by measurement devices such as the current transformer CT of the line can be offset; and high anti-interference performance can be realized.

The invention discloses a positioning system and a positioning method of indoor high-density mobile tags. The positioning system comprises a positioning server, an Ethernet switch, a synchronous clockcontroller, anchor nodes and tag nodes; an LF and UWB double-frequency communication mode is adopted between the anchor nodes and the tag nodes, UWB realizes uplink communication from the tag nodes to the anchor nodes, and LF realizes downlink communication from the anchor nodes to the tag nodes; the positioning server, the synchronous clock controller and the anchor nodes are communicated via awired Ethernet, and the positioning server, the synchronous clock controller and the anchor nodes are respectively connected with the Ethernet switch; and the synchronous clock controller is connectedwith each anchor node, provides a UWB transmitting-receiving circuit clock for each anchor node and finishes synchronization of positioning timers among all the anchor nodes in the system. Accordingto the positioning system and the positioning method of the indoor high-density mobile tags, advantages of LF and UWB are combined, the bandwidth required by UWB positioning communication is reduced,and power consumption of mobile tags is reduced.

The invention discloses a high-rigidity joint torque sensor, belongs to the field of torque measurement, and solves the problem of weak output signal quality caused by easy influence on a traditional joint torque sensor by the radial force and the axial force of a harmonic reducer. The sensor comprises a torque input disc, a torque output disc, four strain beams and eight strain pieces; two ends of the strain beams are fixedly connected with the outer edge of the torque input disc and the inner edge of the torque output disc as a whole; and the four strain beams are uniformly distributed in the peripheral direction of the torque input disc. Two surfaces, not parallel to the end surface of the torque input disc, of the strain beams are two side surfaces; and the strain pieces are respectively arranged on the two side surfaces of the strain beams. The strain pieces on the first and second strain beams form a first full-bridge measurement circuit; the strain pieces on the third and fourth strain beams form a second full-bridge measurement circuit; and when the sensor detects a joint output torque, the stress directions of the strain pieces are tangential to the rotating direction of the sensor. The sensor is used for detecting the joint output torque.

The invention relates to a switch power magnetic isolation reactive circuit for a feeding back output voltage error signal. The invention provides a switch power magnetic isolation reactive circuit for a feeding back output voltage error signal, comprising an output voltage comparison unit, a magnetic isolation feedback unit and a rectifier unit, wherein the output voltage comparison unit is usedfor sampling, comparing and compensating output voltage Vout of a DC / DC switch power supply, thus obtaining an output voltage error signal; the magnetic isolation feedback unit is used for chopping the output voltage error signal obtained by the output voltage comparison unit, thus obtaining a pulse square wave signal; furthermore, the magnetic isolation feedback unit can send the signal to a primary side by a magnetic feedback transformer; the rectifier unit is used for carrying out half-wave rectifying on the pulse square wave signal obtained by the magnetic isolation feedback unit, thus obtaining feedback voltage Vfb and outputting the feedback voltage Vfb to a primary side control chip so as to realize the closed ring controlling on the output voltage. The switch power magnetic isolation reactive circuit has the benefits that a circuit is simple, few elements are adopted, the application scope is wide, and the switch power magnetic isolation reactive circuit can be widely applied to the application in which the magnetic isolation feedback is required and has strong radiation resistance and strong interference resistance.

The invention belongs to the field of power systems, and relates to a power transmission line laser external force damage prevention monitoring and early warning device. All-weather monitoring is performed in the region of frequent construction, high number of trees in the passage and frequent human and animal activities outside the power transmission line by using laser detection and the camera video transmission device based on the laser intelligent detection technology and the image monitoring technology through combination of the characteristics of the power transmission line, and the external damage hidden trouble can be warned in the early stage and discovered in time and eliminated so that the failure trip rate of the power transmission line can be reduced and the reliability of thepower transmission line can be enhanced. The actual demand of the present high voltage power transmission line and tower safety monitoring can be greatly met so that the power transmission line inspection efficiency can be effectively enhanced, and powerful guarantee can be provided for enhancing the modern management level of the high voltage power transmission line of the power industry.

The invention relates to a control device of an electric system static var compensator (SVC), in particular to a double SVC coordination control device. The control device comprises a measuring unit, a voltage adjustor, a distributing unit, a synchronizing system, a protecting unit, an on-off input unit, an on-off output unit and a valve base electronic unit; the measuring unit is respectively connected with the voltage adjustor and the protecting unit, the voltage adjustor is connected with the distributing unit, the protecting unit is respectively connected with the distributing unit and the on-off output unit, the distributing unit is respectively connected with the on-off input unit, the on-off output unit and the valve base electronic unit, and the valve base electronic unit is connected with the synchronizing system and a thyristor control reactor (TCR). Double SVC coordination control is achieved by the adoption of one control system, TCR coordination control and gain optimization under two main transformers in the same transformer substation are achieved, and circulating switching and capacitive reactance interlocking logic of multi-group parallel-connection capacitive circuit branches or sensitive circuit branches under all sections of buses are achieved.