64results 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.

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.

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.

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 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.

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).

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 system includes the voice data bank, the multiple base stations and the least one mobile unit. The voice data banks stores the explication service voice information in multiple language systems. The multiple base stations are setup at each display zones of exhibitions. Each base station can pickup the explicatino service voice information from the voice data bank and make wireless communication to the mobile units. The mobile units are proviced for visitor to wear to listen the explication. The mobile units can detect the wireless signal from specific base station and create the synchronous or non-synchronous linkage with the base station in order to receive the explication service voice information. Based on the language system users decided, the service provides the mobile interactive environment.

The invention relates to a high-precision anti-interference control method for an unbalanced gun barrel. The problems that in the prior art, system interference suppression is not ideal enough, and system control precision is not high enough are solved. According to the technical scheme, the method comprises the steps that firstly, the composition structure and the working principle of an unbalanced gun barrel pitching system under the actual combat working condition are analyzed, and an unbalanced gun barrel pitching electro-hydraulic servo system mathematical model considering the road condition influence is established; secondly, a correction link and a pressure difference negative feedback loop are adopted to restrain the influence of pavement grade change and unbalanced torque on the control performance of the gun barrel pitching system; and finally, the step input instruction signal U1 and the random road surface fluctuation signal theta2 are used as an input item and an external interference item respectively, parameter setting of the ADRC-PID cascade controller is adjusted, and analysis and calculation of system control characteristics during gun barrel turning and stable operation under the dynamic working condition are carried out.

The invention provides a group sparse underwater acoustic channel estimation method in a pulse interference environment. (1) defining a new cost function; (2) calculating a prior error and gains; (3)updating an estimator tap coefficient and a regularization parameter for representing the sparsity; and (4) continuously iterating until the error is converged. The method has the advantages that (1)the p norm of the estimation error is taken as a cost function, so that the influence of pulse interference is effectively suppressed, and the robustness is high; (2) the mixed norm is used as sparseconstraint, and the group sparse characteristic of the channel is fully utilized; And (3) the regularization parameters are adaptively updated, the magnitude of applied constraints is continuously adjusted according to the change of the underwater acoustic channel sparsity, and the estimation performance is better.