67results about How to "Suppression of interference effects" patented technology

The invention relates to a water ship trajectory tracking control method for actuator asymmetric saturation. The method comprises steps: 1, an expected tracking trajectory is given, an expected plane position (x<d>, y<d>) is given, an expected yaw angle psi<d> is given, and the expected trajectory is presented to be eta<d>=[ x<d>, y<d>, psi<d>]<T>; 2, a trajectory tracking error is calculated, and the error, z1=eta - eta<d>, between the actual trajectory and the expected trajectory is calculated; 3, an expected speed is calculated, and the expected speed alpha needed for eliminating the error between the expected trajectory and the actual trajectory is calculated; 4, a neural network is designed, an uncertainty delta in a kinetic equation uses the neural network delta=W<*T> phi(theta) + epsilon to be approximately expressed; 5, an auxiliary control system is designed, a Gauss error function is used, and a smooth asymmetric saturation actuator model is designed; and 6, a model control law is calculated, a control quantity tau needed for eliminating the error between the expected trajectory and the actual trajectory is calculated. The method can approximate a model uncertainty, suppress external disturbance influences, resist asymmetric saturation of an actuating mechanism, track any expected trajectory and ensure gradual stability of the system.

The invention relates to a trajectory tracking control method for an input-output asymmetrically limited full-drive surface ship. The trajectory tracking control method comprises the steps of: conducting error calculation according to a given trajectory expected tracking value; then conducting trajectory kinematic control calculation according to a trajectory kinematical equation, so as to obtain a virtual control law; approximating an uncertain item in a surface ship model by utilizing a neural network, designing an auxiliary control system to solve the saturation problem of actuating mechanisms, and then acquiring a control quantity based on a surface ship kinematical equation; and finally applying the control quantity to the surface ship model. In practical application, state quantities such as trajectory and speed of the surface ship are measured by sensors, and the control quantity obtained through calculation by adopting the trajectory tracking control method is transmitted to the actuating mechanisms such as a steering engine and a propeller, thus a trajectory tracking control function of the surface ship resisting the uncertain item, resisting disturbance and resisting asymmetric saturation problem of the actuating mechanisms can be realized.

A radio transmission apparatus includes: a guard interval insertion unit that inserts a guard interval in every data block of a transmission data signal; a waveform shaping unit that performs a signal attenuation processing in a time period that includes a boundary of a signal block in which the guard interval has been inserted; and a controller that controls an insertion period of the guard interval by the guard interval insertion unit such that the data block is located in a time period exclusive of the time period which is a signal attenuation period by the waveform shaping unit. By this, in an environment where a signal to which a window function (band limitation) is applied may be received, while the guard intervals are effectively utilized, degradation of reception characteristics due to influence of the band limitation is prevented.

A rotor of a rotating electric machine includes a field core having a cylindrical boss portion, and a plurality of claw-shaped magnetic pole portions that are arranged on the outer side of the boss portion and form poles of alternately different polarities in the circumferential direction, a field winding that is wound around the outer periphery of the boss portion and generates a magnetomotive force by energization, a permanent magnet disposed between the circumferentially adjacent claw-shaped magnetic pole portions so as to have its easy axis of magnetization oriented in the circumferential direction and have its polarity coincide with the polarity of the claw-shaped magnetic pole portions which alternately appears by excitation, and a magnetic flux short circuit member having a short circuit portion that magnetically connects the claw-shaped magnetic pole portions circumferentially arranged to have different polarities.

The invention relates to a quadrotor autonomous ship landing method based on saturated adaptive sliding mode control. The method comprises steps that firstly, quadrotor and unmanned six-DOF models are established, through coordinate transformation, a relative kinematics and relative dynamics model between the two is established; secondly, an outer ring of a relative position controller is designed; thirdly, an inner ring of the relative position controller is designed; fourthly, relative height control design is carried out, expected relative zero height is provided, a control input quantity of a quadrotor is calculated, and height difference between the quadrotor and an unmanned ship is eliminated; and fifthly, relative height control design is carried out, expected relative zero attitude is provided, other three control quantities of the quadrotor are calculated, attitude between the quadrotor and the unmanned plane is eliminated, and the quadrotor is made to stably land on the unmanned ship. The method is advantaged in that a performer saturation problem is effectively solved, influence of model uncertainty and external interference are inhibited, the system is guaranteed to be global unanimous and bounded, and the landing point error of the quadrotor is guaranteed to be in a permitted scope.

The invention discloses a double-microphone noise elimination implementation method and system and smart glasses. The method comprises the steps that a first sound input signal is acquired by a first microphone arranged on the frame of the smart glasses, and a second sound input signal is acquired by a second microphone arranged at the rear end of the leg of the smart glasses; and the sound signal of a sound generating source is acquired by the difference of the first sound input signal and the second sound input signal. The sound signal of the sound generating source is acquired by the difference of the sound input signals acquired by the double microphones so that the interference influence of environmental noise can be effectively suppressed and the recognition accuracy can be enhanced.

A method for locating objects using an FMCW radar in which a ramp-shaped frequency-modulated radar signal is transmitted whose modulation pattern has a plurality of successive ramps having different gradients, received radar echoes are mixed down with the transmitted signal into a baseband, the baseband signal is recorded ramp-by-ramp and transformed into a respective spectrum, for each signal peak found in the spectrum, a noise estimation is carried out in order to distinguish between radar targets and noise or clutter, and by comparing the frequency positions of the mutually corresponding signal peaks in the spectra obtained for various ramp gradients, the distances and relative velocities of the radar targets are determined.

A semiconductor device having a plurality of phase change devices rewritably storing data, comprising: an insulating film deposited on a semiconductor substrate using an insulating material having sufficient adhesion to a chalcogenide-based phase change material; a chalcogenide film formed by embedding the chalcogenide-based phase change material in a hole formed at each of bit areas separated from each other in the insulating film; and an electrode structure for supplying a current to each the phase change device made of the chalcogenide film in the bit area.

A beat signal (RD) sampled is cut into a plurality of pieces of short-time data (SD) in a time direction for each antenna element. The interfering component frequency of an interfering wave is detected from the frequency spectrum of the short-time data (SD). The interfering component frequency of the interfering wave is subjected to a digital beam forming treatment so that the peak of an electric power in an azimuth direction is extracted to estimate the absolute value of the interfering component in an arriving azimuth. From the absolute value of the estimated interfering component in the arriving direction, a filter for suppressing the interfering component is activated to suppress the interfering component.

The invention provides an interference suppression method for a multi-band orthogonal complementary code ultra wideband system based on nonlinear Sqrt Chirp pulses. The method comprises the following steps: dividing a UWB frequency band at a sending end to obtain L different sub-frequency bands, and matching and setting a corresponding Chirp pulse according to whether a narrow band interference signal exists in each sub-frequency band to realize high-speed and multi-rate transmission. According to the interference suppression method provided by the invention, the nonlinear Sqrt Chirp pulse is designed and adopted in the sub-frequency band with the narrow band interference signal, and the nonlinear Sqrt Chirp pulse can pass by the frequency band subjected to narrow band interference at the maximum instantaneous frequency to more effectively suppress the influence of the narrow band interference and meanwhile suppress multiple narrow band interference. The interference suppression method provided by the invention is used for carrying out spread spectrum modulation on each sub-frequency band Chirp pulse based on the good correlation properties of the orthogonal complementary code to eliminate the multiple access interference between users, the interference of the sub-frequency bands and multipath interference, and is used for simultaneously suppressing and eliminating multiple kinds of interference and effectively improving the antijamming capability and the communication performance of the system.

A mobile communication system supports cellular communication in which a data path passes through a core network and D2D communication that is direct device-to-device communication in which the data path does not pass through the core network. The system comprises a communication apparatus that assigns a radio resource to a D2D terminal that performs the D2D communication, wherein the communication apparatus performs assignment determination as to whether a dedicated radio resource not shared with the cellular communication is assigned to the D2D terminal or a shared radio resource shared with the cellular communication is assigned to the D2D terminal.

The invention discloses a license plate character automatic detection, positioning and recognition method in a complex background environment. The method comprises the following steps: 1, the front color image of a vehicle is acquired, the acquired color image is preprocessed, screening conditions are selected according to the national standard for a license plate, whether an image area meets thescreening conditions exists is judged, if yes, the coarse position of a license plate initial area image is acquired initially and the image is saved separately, or otherwise, a next frame of color image is acquired for preprocessing again; 2, precise positioning on a license plate area is completed, and accurate segmentation on a single character of the license plate area is carried out; and 3, the similarity between a feature vector of a target character and a feature vector of a built standard character feature vector library is calculated, license plate character recognition is completed by using a similarity discrimination method, and target license plate comparison and judgment are carried out. The method of the invention has the advantages of fast operation speed, high recognition rate and strong background environment interference-resisting ability.

The invention discloses a feature point identification method aiming at pose measuring of a cooperation marker. The method comprises the steps of: (1) threshold value division and judgment of connected regions; (2) calculating shape factors of the connected regions and solving a round connected region; (3) solving a square identification box according to the diameter of the round connected region, dividing four quadrants in the identification box, and calculating quantity of the connected regions, the shape factors, diameters and distance to the center of the identification box in each quadrant. The cooperation marker and respective feature points in an image are identified. The method solves the problem of identification and positioning of image feature points under the condition that the feature points are partially shielded and interfered in the visual pose measuring process of rendezvous and docking of a spacecraft, and an identification result is accurate and reliable.

The invention discloses a preparation method and application of a multi-core optical fiber coupler with broadband flat transmission function, and belongs to the field of optical fiber communication and sensing, and the preparation method comprises the following steps: stripping and cutting part of coating layers on the surfaces of N non-multi-cladding optical fibers, stripping the coating layers on the surfaces of the N multi-cladding optical fibers and cutting, and welding two cutting ends to obtain a third middleware; stretching the circular capillary tube to obtain a fourth middleware; inserting the third middleware into the fourth middleware, so that the second non-multi-cladding optical fiber area is completely or partially located in the first taper waist area, wherein the multi-cladding optical fiber area is located in the first taper waist area and the first rising taper area at the same time, and obtaining fifth middleware; and heating and stretching the first conical waist area of the fifth middleware, cutting the second conical waist area, selecting a part from the left end to the cutting end, and aligning and welding the cutting end and the multi-core optical fiber to obtain the multi-core optical fiber coupler with the broadband flat transmission function. According to the invention, low-loss connection in a broadband range can be realized, and the fluctuation degree of transmission loss is suppressed.

The invention provides a multi-student individual segmentation and state autonomous recognition method based on deep learning, and the method comprises the steps: collecting a normal class video, carrying out the framing, and obtaining continuous frame images of a class video; segmenting out students' individuals and non-students' individuals, and marking the non-students' individuals as masks ofdifferent colors; finding a human eye feature point of each student individual through a human face feature point positioning method, calculating a human eye closure feature value of each student individual, and judging whether each student individual is in a lecture attending state at present or not; judging whether faces are detected by all the student individuals or not, and judging the class attending state grades of the student individuals; and designing the student lecture attending efficiency evaluation method in the whole class period according to whether each student is in a lecture attending state or not and whether each student is in a non-head-up state or not. The invention provides a solution for realizing the autonomous identification of the student lecture attending state and the judgment of the lecture attending efficiency, and has the advantages of high speed, high identification rate and strong environmental adaptability.

A method and transceiver for wireless multicarrier communications. At the transmitter side, conventional OFDM symbols, after inverse fast Fourier Transform, are scrambled in time domain and then guard-interval (GI) inserted, up-converted at the carrier frequency for transmission. At the receiver side, after GI removal and frequency domain channel equalization, the received signal is transformed into time-domain by inverse fast Fourier Transform. The time-domain equalized signal is descrambled in time domain and then transformed back to the frequency domain before it is rate-matched, demodulated and decoded. This time-domain scrambling and descrambling method can be used in a wireless OFDM system such as WLAN, cellular OFDM, and MC-CDMA.

The invention relates to a measuring device for measuring the magnetic properties of the surroundings of the measuring device by means of a sensor line having at least one magnetoresistive sensor element extending in a line direction, which can measure the magnetic properties in the surroundings thereof, wherein the sensor element has a width and a length as well as a height, wherein the height is smaller than the width, and the height is smaller than the length, and the line direction points in the direction of the width or in the direction of the length of the sensor element, and having a support field device which generates a magnetic support field in the area over which the sensor line extends, having a premagnetization device which comprises a premagnetization magnet or several premagnetization magnets, wherein at least one premagnetization magnet is arranged in a direction which is perpendicular to the line direction, spaced from the sensor line, and extends in a direction parallel to the line direction, characterized in that magnetoresistive sensor element can measure the magnetic properties of the surroundings thereof substantially in only one direction, referred to as the measurement direction, of an orthogonal coordinate system, or substantially in only one plane, referred to as the sensor measurement plane, which is defined by two perpendicular measurement directions of an orthogonal coordinate system, in that, in the case of a premagnetization device which consists of only one premagnetization magnet, the properties of the premagnetization magnet, which influence the magnetic field generated by said magnet and the arrangement of said magnet relative to the sensor cell as well as the support field generated by the support field device are selected in such a manner that an overlap magnetic field forms due to the overlap of the magnetic field generated by the premagnetization device and of the support field, wherein the strength of the field component of said overlap magnetic field, which points in the line direction is, at least at one site on the sensor line, greater than the strength of the field component which is perpendicular to the line direction and does not point in the direction of the height of the sensor element, or in the case of a premagnetization device consisting of several premagnetization magnets, the properties of the premagnetization magnet, which influence the magnetic field generated by said magnets, and the arrangement of the premagnetization magnets relative to the sensor cell as well as the support field generated by the support field device are selected in such a manner that an overlap magnetic field forms due to the overlap of the magnetic field generated by the premagnetization device and of the support field, wherein the strength of the field component of said overlap magnetic field, which points in the line direction is, at least at one site on the sensor line, greater than the strength of the field component which is perpendicular to the line direction and does not point in the direction of the height of the sensor element.

A three-degree-of-freedom helicopter anti-saturation attitude tracking control method includes the steps of: 1. giving an expected tracking value: an expected attitude angle x<d>=[rho<d>epsilon<d>]<T>; 2. performing attitude angle tracking error calculation: an error between the expected attitude angle and an actual attitude angle z<1>=x-x<d>; 3. performing virtual control law design: designing v<d> and solving a derivative of v<d> to time as a state quantity in a neural network; 4. performing neural network design: the formula is as described in the specification, approaching an uncertain term in a 3-DOF helicopter dynamics equation; 5. performing auxiliary control system design: designing a state quantity u, and solving the problem of input saturation; 6. performing model control law design: utilizing the state quantity u of the auxiliary control system to correct an attitude angle speed tracking error term, and combined with the neural network, estimating the uncertain term, thereby finally obtaining a model control law; and 7. applying the model control law to a 3-DOF helicopter nonlinear model to perform attitude angle tracking simulation. The method can approach the model uncertain term, inhibit external disturbance influence, resist execution mechanism saturation and track any expected attitude, thereby guaranteeing asymptotic stability of a system, and simplifying a calculation process.

A dynamic light scattering measurement device includes an irradiation section that applies light emitted from a low-coherence light source to a sample that includes particles, a spectral intensity acquisition section that disperses reflected light from a reference plane and scattered light from the sample that has passed through the reference plane to acquire a spectral intensity of interference light of the reflected light and the scattered light, the reference plane being situated to intersect an optical path through which the light is applied to the sample, and a measurement section that measures dynamic light scattering of the sample based on the acquired spectral intensity.

The invention relates to a matching circuit, a radio frequency front-end power amplification circuit and a mobile communication device, the matching circuit is used for a radio frequency front-end power amplifier, and the matching circuit comprises: a first impedance matcher, wherein the impedance of the first impedance matcher is a first preset impedance at a first frequency; a first band-pass filter which is bridged between the front end of the first impedance matcher and the ground, wherein the signal of the first frequency passes through the first band-pass filter, and at least one of a signal of a second frequency and a first harmonic signal of the signal of the first frequency is suppressed by the first band-pass filter, and the second frequency is lower than the first frequency; and a first wave trap which is bridged between the rear end of the first impedance matcher and the ground and is used for suppressing a second harmonic signal of the signal of the first frequency.

Remote control data is securely transmitted to a device under control. A remote control device transmits an acknowledge request for A ch to the device under control (S21). When the device under control has assigned A ch as the reception channel, acknowledge ACK is received. A ch is assigned as the transmission channel (S23), and a command frame is transmitted through A ch (S24). When acknowledge ACK has not been received, an acknowledge request for B ch is transmitted to the device under control (S25). When the device under control has assigned B ch as the reception channel, acknowledge ACK is received. B ch is assigned as the transmission channel (S27), and a command frame is transmitted through B ch (S28). The remote control device can transmits a command through a channel through which the device under control can receive the command, so that secure remote control can be accomplished.

The apparatus for monitoring a photovoltaic system (1) comprises incoupling means (20) for coupling an AC voltage test signal into the photovoltaic system (1), outcoupling means (40) for outcoupling a response signal, which is associated with the test signal, from the photovoltaic system (1), and an evaluation device (50), which is connected to the outcoupling means, for identification of events which adversely affect correct operation of the photovoltaic system. The apparatus is distinguished in that the outcoupling means (40) have a first transformer (410) and a second transformer (420), each having a respective primary winding (411, 421) and each having a respective secondary winding (412, 422) which is connected to the evaluation device (50), with the primary windings (411, 421) of the first and second transformers (410, 420) being arranged in different electrical lines (4, 5) between a generator (2) and an inverter (3) in the photovoltaic system (1). The invention also relates to a corresponding method for monitoring a photovoltaic system (1).

A radio reception device and a radio receiving method are provided that, when a frequency band assigned to a different radio system is shared, can effectively suppress the influence of interfering waves from this different radio system. A radio reception device is one in a second radio system (11) that can use a frequency band assigned to a first radio system (10), and includes: a desired wave channel estimation section (110) that generates, based on reception signals, first channel estimate values (Es) of interfering wave components arriving from the first radio system, which uses a different communication scheme from that of the second radio system; an interfering wave channel estimation section (120) that generates, based on the reception signals, second channel estimate values (Ei) of desired wave components received through the communication scheme of the second radio system; and an equalization section (105) that suppresses the interfering wave components by using the first and second channel estimate values.

The invention discloses a multi-user underwater acoustic communication method based on a single-vector hydrophone. An original information sequence of a transmitting end is sent out through carrier modulation after being subjected to differential encoding and direct sequence spread spectrum codes respectively; a receiving end vector hydrophone outputs signals, vector combination processing is firstly carried out on the signals, then time reversal processing is carried out on the signals obtained after vector combination, the signals obtained after time reversal processing are sent to a spreadspectrum receiver to complete decoding processing of a current user, and finally zero setting interference offset processing is utilized for removing decoded users. The method has the beneficial effects that each user is decoded in sequence according to the power, so that the influence of multi-access interference when the user is expected to decode can be effectively inhibited. And after the expected user finishes decoding, the high-power user is eliminated by utilizing zero-setting interference cancellation processing, so that the subsequent user decoding is not interfered by the high-poweruser, the problem of underwater near-far effect can be effectively solved, and the performance of the underwater multi-user communication system is remarkably improved.

The present invention provides a controller with a double-closed-loop structure for controlling an unstable lag object. The double-closed-loop structure is formed by primary and secondary controllers. The secondary controller is a PD controller which is in an inner loop feedback loop and is used for stabilizing the unstable lag object and eliminating an unstable pole. The main controller is a combined integral controller which is in an outer loop forward loop and is used for eliminating the influence of input disturbance and allowing a control system to reach a specified dynamic performance index. According to the controller provided by the invention, the disadvantages in the prior art are overcome, the double-closed-loop structure formed by the combined integral controller and the PD controller is used, the controller has the advantages of a simple structure, few adjustable parameters and convenient and intuitive parameter adjustment. Under a nominal model, the output of the system is stable and has no overshoot, and the influence of interference can be effectively suppressed. When the model is mismatched, the controller still has good control performance and robust stability.

The invention discloses application of flow switches in a fire fighting system of a high-rise building with the height of 250 meters or above. A fire fighting pipe network is arranged in a floor corresponding to each floor area. The fire fighting system comprises a plurality of water storage pools, wherein the water storage pools correspond to the floor areas one to one and are each connected withtwo fire fighting water supply pipelines arranged in parallel, and the two fire fighting water supply pipelines form branches with the first flow switches and are connected into the fire fighting pipe networks arranged in the floors of the corresponding floor areas correspondingly; a plurality of transmission water pumps, wherein the transmission water pumps are connected to the two fire fightingwater supply pipelines connected with the water storage pools; a tower top fire pool, wherein the tower top fire pool is arranged on the roof of the high-rise building, two gravity fire fighting water supply pipelines which are provided with the second flow switches and sequentially connect the water storage pools in series downwards are arranged at the bottom of the tower top fire pool, and thesecond flow switches are connected to an external fire automatic alarm system; and a controller, wherein the controller is electrically connected with the first flow switches and the transmission water pumps. According to the scheme, response is fast, water division is accurate, and cross-water-supply and partition fire crossing or cross-region second-time water supply control with fire hydrants can be achieved.

The invention provides a cluster autonomous landing algorithm based on fuzzy control. A landing mark is a red circle, an Arabic numeral is arranged in the red circle, each circle has a number, and the numbers are not repeated. Unmanned aerial vehicles find their landing positions by identifying the red circles containing different numbers. A cluster landing point adopts a three-unmanned-aerial-vehicle triangular layout as a basic layout unit, each unmanned aerial vehicle in a cluster carries a simple image acquisition device and a processing system, and each unmanned aerial vehicle identifies the corresponding landing identifier by using a target detection algorithm after arriving at a specified landing waypoint, converts the pixel distance between the center of the landing mark in the image and the view center of the unmanned aerial vehicle into the actual horizontal distance between the unmanned aerial vehicle and the landing identifier, sets the distance as the input quantity, colves the speed control quantity based on fuzzy control for landing, adopts stepped landing in order to guarantee the landing precision during landing, carries out deviation calculation on the unmanned aerial vehicle and the landing point at different specified heights, and lands on steps from high to low.

The steering control apparatus determines whether or not a deviation degree of a current traveling route of a vehicle with respect to a target traveling route is equal to or more than a predetermined threshold, when steering control is switched from manual steering control to automatic steering control. In the automatic steering control, a command steering angle is calculated so that a difference between a real traveling route of the vehicle and the target traveling route is eliminated. However, when the deviation degree is equal to or more than the predetermined threshold, the steering control apparatus recalculates the command steering angle used in the command steering angle tracking control based on a steering angle at the time of starting the automatic steering control and the command steering angle so that a real steering angle after switching to the automatic steering control changes gradually to the command steering angle.

A radio reception device and a radio receiving method are provided that, when a frequency band assigned to a different radio system is shared, can effectively suppress the influence of interfering waves from this different radio system. A radio reception device is one in a second radio system (11) that can use a frequency band assigned to a first radio system (10), and includes: a desired wave channel estimation section (110) that generates, based on reception signals, first channel estimate values (Es) of interfering wave components arriving from the first radio system, which uses a different communication scheme from that of the second radio system; an interfering wave channel estimation section (120) that generates, based on the reception signals, second channel estimate values (Ei) of desired wave components received through the communication scheme of the second radio system; and an equalization section (105) that suppresses the interfering wave components by using the first and second channel estimate values.