392results about How to "Improve operation accuracy" patented technology

The invention relates to the technical field of automatic driving, in particular to an automatic driving system based on a highway. The automatic driving system comprises a sensor, a positioning module, a man-machine interaction module, an automatic driving controller and a vehicle executing module. A traditional laser radar is replaced with a monocular camera, a stereo camera, a forward-direction long distance millimeter microwave radar and four-corner middle distance millimeter microwave radars which are arranged behind an inside-vehicle rearview mirror, at the center of a vehicle front bumper and on the two sides of the front bumper and a rear front bumper correspondingly. Multiple kinds of information in traffic sign road information and obstruction information are collected separately. The whole automatic driving system of perception fusion, path planning, decision planning, controlling and the like is integrated into an embedded type controller to achieve automatic driving. Compared with a traditional automatic driving system adopting the laser radar, the cost is low, and integration is easy. Perception precision is improved greatly, the system is high in integration level and small in size, the size of the automatic driving system is reduced greatly, the power consumption of the system is lowered, and mass production is easy.

In order to provide a neural network computing apparatus and system, as well as a method therefor, which operate via a synchronization circuit in which all components are synchronized with one system clock, and which include a dispersion-type memory structure for storing artificial neural network data, and a calculating structure for processing all neurons through time-sharing in a pipeline circuit, the present invention comprises: a control unit for controlling the neural network computing apparatus; a plurality of memory units for outputting both a connecting line attribute value and a neuron attribute value; and one calculating unit for using the connecting line attribute value and neuron attribute value inputted from the plurality of memory units so as to calculate a new neuron attribute value and provide feedback to each of the plurality of memory units.

The invention provides a measuring device and method for the target line-of-sight angel offset and distance. The device is composed of a four-quadrant avalanche photodetector, a receiving and sending optical unit, a noise compensation circuit, a four-circuit front amplification circuit, a video amplification circuit, an automatic gain amplification circuit, a peak keeping circuit, an AD conversion circuit, a laser, a dominant wave sampling circuit, a summing circuit, a time identifying circuit, a time test circuit and a digital processing circuit, wherein the receiving and sending optical unit enables narrow pulse laser rays emitted by the laser to be converged on the photoelectric detector to form echo light spots after target reflection, photovoltaic conversion of the four-quadrant avalanche photodetector, front amplification, video amplification and automatic gain amplification are conducted, narrow-pulse peak keeping is conducted, transmission of the AD conversion circuit is conducted, and the digital processing circuit extracts the digital line-of-sight angel offset; summing is conducted on the four-circuit front amplification circuit, the dominant wave sampling circuit is combined, the time identifying circuit determines laser emitting and echo coming and returning time, the time is transmitted to the time identifying circuit to be measured, and the digital processing circuit decodes the corresponding distance.

A glove for operating a capacitive touch panel is provided. The glove of the invention comprises a glove body and a plurality of conductive parts. The glove body has a plurality of fingertip parts and the conductive parts are sewn through on the fingertip parts respectively. When a user wears the gloves of the present invention, the static electricity in the user's fingertips would be coupled with the capacitive touch panel through the conductive parts for touch control.

The invention discloses a convolutional neural network-based target detection method and system. The method comprises the steps of constructing a data set of a detected target; dividing the image datain the data set of the detected target into a training set, a test set and a verification set according to a preset proportion, and marking images in the training set, the test set and the verification set; constructing a network structure of a convolutional neural network model, wherein the convolutional neural network model adopts different feature scales to predict an object; loading a training set into the convolutional neural network model for training; in the training process, a verification set is loaded, and parameters of the convolutional neural network model are optimized through amulti-verification method; carrying out performance test on the convolutional neural network model through the test set, and detecting the generalization capability of the convolutional neural networkmodel; and carrying out target recognition is carried out by adopting a convolutional neural network model with the generalization capability meeting requirements. The convolutional neural network model obtained through training can quickly and accurately identify small targets, compact and dense targets or highly overlapped targets in a shopping mall.

An aero-engine online optimization and multivariable control design method based on model predictive control achieves the control and online optimization of multiple variables of an aero-engine undera constraint and according to requirements of thrust and speed. A control system consists of two parts. The first part is a prediction model acquisition layer. Based on the actual working state of each control cycle and the external environmental parameters of the aero-engine, an engine small deviation linear model near different steady-state points is continuously established, and model parameters are provided for a model predictive controller. The second part is a control law decision layer. A closed-loop structure is formed by the model predictive controller and an external output feedback.The model predictive controller, based on an engine model in the current state, a control command and relevant constraint limits, determines the output of the controller at the next moment by solvinga linear optimization problem. The external output feedback introduces the aero-engine actual output into the decision on future controlled quantity of the controller to compensate for the influenceof model mismatch and external disturbances.

An equipment for making abrasive particles in even distribution, array pattern and preferred orientation comprises an adsorbing releasing apparatus being composed of a plurality of acicular soft magnetic metallic sticks, an upper and a lower stators, and a plurality of windings. Each winding forms an electric circuit through a electrical source, a resistance, and a switch a plurality of blind holes being distributed on face of the blind hole feeding tropism board. Using electric current to form magnetic field for the acicular soft magnetic metallic sticks absorb or release abrasive particles plated with soft magnetic materials. The equipment is simple, convenient in operation, high in efficiency and reliability. The equipment makes abrasive particles in matrix with an ideal state in distributing density, uniformity, arrange, and tropism. Thereby, the function of the abrasive materials is fully exerted and the life of products is prolonged.

The apparatus comprises: a signal modulating unit, a check meter circuit, a digital signal process unit, a display unit and a network interface unit. The analog output signals from the mutual inductor under test and the standard transformer are inputted to the signal modulating unit to make modulation; the modulated signals are inputted to the check meter circuit; the digital signals from the mutual inductor are directly inputted into the check meter circuit; the modulated analog signals and / or the un-modulated digital signals are processed by the check meter circuit to form the digital signals in clock and data synchronization; the obtained synchronous digital signals are outputted to the signal processing unit; after processed to get the amplitude, frequency and phase information of the tested signals, then figuring out the ratio difference and angle difference; comparing the index result obtained from the mutual inductor under test with the measurement result of the standard mutual inductor to evaluate the precise level of the mutual inductor under test.

A radiation therapy apparatus has a multi-leaf collimator device, a driving gear, a torque wire and a driving unit. The multi-leaf collimator device has a pair of collimator components which respectively comprise a plurality of leaves arranged close to one another such that the leaves face one another across an irradiation axis, and configured to set a desired irradiation field by individually moving the leaves. The driving gear is engaged with a gear tooth of the each leaf, respectively. The torque wire is connected to a shaft center of the driving gear, respectively. The driving unit is configured to drive the driving gears through the torque wire.

A 4D reconstruction method of the vascular axis of coronary artery, which belongs to the field of medical detection technology, comprises following steps: constructing the projection models of an X-ray angiography system at two angles according to X-ray coronary artery angiogram sequences at two angles, deducing the geometric transformation relationship between the two angle images, 3D reconstructing the sampled points of interested blood vessels selected by hand in the image of the first moment, connecting the reconstructed points to obtain a broken line, acquiring the 3D axis of the blood vessel at the first moment by snake transformation with respect to the broken line as the initial position, and acquiring 3D vascular axis in each subsequent moment in the image sequence by snake transformation with respect to the 3D vascular axis of the previous moment as the initial position, thus completing the 4D reconstruction of the vascular axis in the entire sequence. The method can greatly reduce the uncertainty and the error due to the operation of operators, thus improving the repeatability of the result and achieving convenient operation and high efficiency.

The invention provides a predistortion device and a method. An input data is treated by a high speed predistortion and a digital signal is obtained by the feedback of a power amplifier. The result obtained from the parameter relation transformation of a digital signal is compared with the digital signal obtained from the process in which the input data is treated by the high speed predistortion and delayed. When the specification error requirement is satisfied, the related parameter in the parameter relation transformation is updated and saved in a lookup table as a predistortion parameter. The invention can use a uniform predistortion structure in an initial predistortion treatment and a normal predistortion treatment. Adopting the predistortion structure of an indirect discipline parameter, the invention collects data in a descending time slot and proceeds adaptive filtering treatment in an ascending time slot in a mobile communication system of a time division duplex, such as TD-SCDMA and OFDM_TDD system.

The invention discloses a method for realizing a software phase-locked loop with an unfixed sampling frequency. The method comprises the following steps: firstly adopting an analog phase-locked loop digital controlled oscillator of the DSP period counter to obtain digital controlled oscillator output signals; then working out the phase error between the mains voltage and a reference signals in the DQ-transformation phase demodulation mode by using the digital controlled oscillator output signals as the reference signals; and establishing a closed loop transfer function secular equation of a phase-locked loop system and determining the parameters of the designed loop filter based on the digital controlled oscillator output signals and the phase error between the mains voltage and the reference signals. The invention can maintain the fixed number of the sampling points in the primitive period, and is used for repeatedly controlling various grid-connected converting devices, such as active electric filters, new energy-powered grid-connected converters and the like. By adopting the DQ-transformation phase demodulation mode, the invention can well inhibit the harmonic and unbalanced mains, resist the fluctuation of the mains voltage, and ensure the reliable operation of the phase-locked loop under the conditions of multiple mains voltage zero passage, voltage harmonics, voltage fluctuation and mains voltage imbalance.

The invention provides an electronic image stabilization method based on inertial navigation information. The method comprises the following steps that: firstly, feature points of each image of a video are extracted, subsequently the overall motion estimation is carried out on two adjacent frames by using a feature point matching algorithm; if the overall motion estimation has larger errors, the overall motion is estimated by using motion information obtained by an inertial navigation system so as to compensate the errors caused by the fact that the overall motion is estimated by merely using an image; the overall motion estimation adopts an affine transformation model; then motion filtering is carried out on the model in combination with the image and the inertial navigation information so as to distinguish the active motion and a trembling component of a camera; and moreover, a rotational component introduced because of the trembling is determined; and furthermore an original video image is compensated by using the obtained trembling and rotational components so as to obtain a stable video; and the image restoration treatment is carried out on each frame of image of the video in combination with the image information and the inertial navigation prediction motion information. The method needs no complex hardware and is good in electronic image stabilization; and the calculation precision is improved.

The invention provides a heart rate variability analysis method, which comprises the following steps of collecting an electrocardiosignal; performing amplification processing on the collected electrocardiosignal, and outputting the processed electrocardiosignal; receiving the amplified electrocardiosignal; performing denoising processing on the amplified electrocardiosignal; extracting R wave feature parameters in the denoised electrocardiosignal; judging and counting the heart beat type and calculating time domain and frequency domain indexes according to the R wave feature parameters; and outputting an electrocardiogram analysis report according to the heart beat type, the time domain index, the frequency domain index and statistic data, and performing encrypted storage. According to the embodiment of the invention, the weak electrocardiosignal is amplified in the electrocardiosignal collecting process; then, the amplified electrocardiosignal is subjected to noise filtering through the heart rate variability analysis processing; the judgment on each heart beat is realized; and the accuracy and the practicability of the diagnosis are improved.

The invention provides an alternating tidal current computing method and device for a light high-voltage direct current transmission system; the alternating tidal current computing method comprises the following steps of: dividing the whole system into two parts of an alternating current subsystem and a direct current subsystem by using a busbar of an alternating current system as a dividing line, wherein the alternating current system is connected with a converter station; treating the converter station of the alternating current subsystem as an equivalent PQ or PV node on an alternating current node when the variable quantity of the operational state of the alternating current subsystem is solved; and modeling an alternating system as a constant voltage applied on the bus of the converter when an equation set of a direct current system is solved. The alternating tidal current computing device for the light high-voltage direct current transmission system comprises a data acquisition unit, a data transmitting unit and a data processing unit. The invention has the advantages of being simple and easy in implementation, being good in procedure generality, overcoming the disadvantages of bad timeliness, high error rate and the like and increasing the computation speed and correctness. The device adopts a double-port RAM (Random Access Memory) circuit so as to solve the problem of low data transmission speed; and a set of spare double-port RAM (Random Access Memory) is added for ensuring the correctness and reliability of the system operation.

The invention relates to a switch power supply with constant voltage / constant current output and a control method thereof. The switch power supply comprises a PWM control circuit and a power switching device, a first feedback circuit and a second feedback circuit, wherein the first feedback circuit is used for detecting a secondary inductive circuit and generating a first error amplification signal representing the output current information of the switching power supply circuit; and the second feedback circuit is used for detecting an output voltage and generating a second error amplification signal representing the output voltage information of the switching power supply circuit. When the switching power supply is in a first load condition, a switchover control circuit outputs a first control signal to the PWM control circuit, and the switching power supply outputs a constant voltage; when the switching power supply is in a second load condition, the switchover control circuit outputs a second control signal to the PWM control circuit, and the switching power supply outputs constant current.

The invention belongs to the technical field of wireless communication, and particularly relates to a channel estimation algorithm for a multi-user massive MIMO (Multiple Input Multiple Output) system under a frequency division duplex (FDD) mode. In the multi-user massive MIMO system, channel estimation is realized by a sparse signal recovering technology through an inference method based on Bayes compressed sensing, and channel estimation overhead of the FDD massive MIMO system can be lowered greatly.

A bar gun includes a housing assembly with valve seats, separate inlets to those seats and separate outlets from those seats. Valve elements are operatively mounted to the housing to cooperate with the valve seats. Actuators are pivotally mounted relative to the housing assembly to provide two valve actuations per actuator. A bar gun handle is arranged relative to the actuators to improve access to the actuator levers. A low-current electro-luminescent element is arranged behind a light-transmitting cover to improve visibility of labeling on the gun. Actuator bars are pivotally mounted below valve lifters on the actuators. Syrup valve elements and carbonated and noncarbonated water elements are located below the actuator bars to be actuated by the actuator bars to create the appropriate mix. Lost motion is provided between the actuator bars and the syrup valve elements to accommodate differentials in pressures between the waters and the syrups. The connector to the bar gun includes equal length supply tubes contained within a sheath. The tube end pieces at either end include grouped hole patterns. Shut off valves are employed at the tube end piece at the supply end of the connector which close the supply passages when the end piece is removed. Manual valves are also available to shut off individual supply lines.

The invention relates to an unmanned boat target tracking method based on visual feedback in order to solve the problems that existing methods are complicated, the response speed is low, the operationprecision is low and the anti-disturbance capability is poor. The method includes the steps that 1, a KCF tracking algorithm is used for detecting and tracking a tracking target, and a position coordinate of the tracking target is determined; 2, a correspondence relationship, between a pixel coordinate system and a world coordinate system, of the tracking target is established, and a coordinate of the tracking target in the world coordinate system is obtained; 3, an unmanned boat processor calculates the deviation between the position of the tracking target and the position of the unmanned boat processor, sends a command to a motion control unit for conducting control and adjusts the rudder angle of an unmanned boat steering gear and the rotation speed of a propulsion motor to keep the tracking target at the center of a view field of a camera and to keep an unmanned boat and the tracking target within a set distance range, and that is to say that an unmanned boat motion control systemachieves tracking navigation on the target. The unmanned boat target tracking method based on visual feedback is used in the field of unmanned boat navigation.

The invention discloses a space manipulator modeling method based on different geometry. On the foundation that each level rigid body zero position of a space manipulator system is selected, initializing conditions such as a zero position joint vector, a centroid joint vector and an initial vector are calculated and given, and a matrix related to initial parameters and a coordinate position matrix are calculated. The generalized velocity of each connecting rod is calculated through forward recursion, and the generalized force of each connecting rod is calculated through reverse recursion. Each quantity is substituted into the matrixes, and a kinetic equation compact in form is written down. The model has the advantages of being uniform in modeling form and small in operating amount, improving calculation efficiency and accuracy of the space manipulator modeling, and improving the designing accuracy of the space manipulator. The space manipulator modeling method based on differential geometry can be applied to modeling of other space multi-rigid-body systems.

The invention discloses a method for realizing general demodulation of different modulating signals. The method comprises the following steps: firstly, using the direct numerical frequency synthesis method to generate two routes of local orthogonal carrier signals by expanding the rotation mode under the circumferential coordinate in the coordinated rotation digital computer (CORDIC) algorithm ofa convergence domain to synthesize equidirectional subcircuit data xI (t) and orthogonal subcircuit data xQ (t) with receiver terminal output signals; then filtering secondary harmonic components by a low pass filter; afterwards, inputting two routes of signals into a general demodulation module of the vector mode under the circumferential coordinate in the CORDIC algorithm of the convergence domain; finally, selecting a square root operation value or an arc tangent operation value according to different modulation modes to obtain demodulation information by filtering or differencing. In the invention, various modulation modes are integrated in the same hardware, so that the method has the characteristics of good flexibility and outstanding versatile performance; and meanwhile, the complex arithmetic operation is transformed into the displacement and add operation, as a result, the method can greatly reduce the complexity of hardware realization and has good carrier frequency mismatching resistance property.

The invention discloses a satellite tracking and angle measuring method based on a navigational digital multi-beam receiving array antenna. The method is used for computing the incoming wave direction of satellite signals received by the array antenna, and the array antenna adopts an L-shaped array of the digital multi-beam receiving square array antenna. The method includes: firstly, performing branched and synchronous spread spectrum processing for signals received by the array antenna; secondly, performing spatial directional calibration and wired calibration for each channel of the array antenna; and thirdly, obtaining the final signal incoming direction by the aid of obtained despread phase difference data and error matrixes after calibration. The satellite tracking and angle measuring method based on the navigational digital multi-beam receiving array antenna is capable of effectively avoiding the problems of low signal to noise ratio, inconsistency of channel phase response with amplitude response and poor instantaneity resulting in poorer angle measuring performance, and has the advantages of novelty, creativity, simplicity and practicality.

This invention discloses a kind of numerical control device which consists of CPU module, switch module, power amplification module, and communication module. It could control Magnetic Suspended CMG servo system with high degree of accuracy. Data from the servo-actuator such as current, rotate speed and position signal was obtained by interface circuit and transported to CPU module; controlled quantity was created by operation to modulate the PWM; PWM with certain duty ratio was isolated and transported to the power amplification module to drive electric engine. Whole numeralization, integration, and high degree of accuracy control in CMG servosystem was realized in this invention.

The invention discloses a method and a system for intelligently identifying the operation state of an inhaul cable. The method is to respectively detect vibration frequencies before and after loading through a sensor arranged on the inhaul cable to carry out FFT conversion and related calculations respectively, thereby acquiring cable force, bending rigidity and rotational restrict stiffness at two ends of the inhaul cable. The method and the system have the advantages of simplicity, easy realization, high precision and small power consumption.

A remote switch combination shower head includes a first shower head, a second shower head and a switch mechanism, wherein further comprising a fixing seat assembled to a support arm, the fixing seat is disposed with an inlet waterway connected to the support arm, a first diversion waterway and a second diversion waterway; the first shower head is assembled to the fixing seat and is capable of connecting to the first diversion waterway; the second shower head is a hand shower head connected to the second diversion waterway by a flexible pipe; the switch mechanism comprises a switch component and an operation component, the switch component is disposed to the fixing seat and is coupled to the inlet waterway, the first diversion waterway and the second diversion waterway, so that the waterways are switched by the movement of the switch component.

Provided is an input device which has excellent operability by not requiring a finger to be released from a key during operation requiring the finger to shift and preventing the finger from touching a plurality of keys at the same time. A key (12) surrounding a selection key (18) is arranged. On a board (41), four metal domes (14) are arranged at positions corresponding to the four positions, i.e., upper, lower, right and left positions, of the key (12). A touch sensor (13) is arranged on an upper layer above the metal dome (14). The touch sensor (13) is brought into contact with a touch sensor presser (53), and an electrical value (for instance, a resistance value) is changed corresponding to shift of the finger on the key (12). When the key (12) is strongly pressed down, the top of the metal dome (14) is pressed into the substrate (41) side and electricity is carried between contact points (14a, 14b).

The invention discloses a maximum likelihood phase estimation method based on an X-ray pulsar. The maximum likelihood phase estimation method based on the X-ray pulsar comprises the following steps: constructing an X-ray pulsar signal Poisson model structual unit according to the process for measuring the arrival time of a photon which is striken to a detection material of an X-ray detector; fitting the X-ray pulsar profile by utilizing a plurality of Gaussian distribution probability functions and constructing an X-ray pulsar signal simulation structural unit; constructing a maximum likelihood estimation unit for estimating the initial phase and cycle; and constructing a phase parallel computing unit for improving the peak value searching performance of a cost function in a new model. Not only is the calculation quantity reduced, the calculation time is shortened, but also the high operation precision is ensured, and the maximum likelihood phase estimation method based on the X-ray pulsar has significant meaning in studying the X-ray pulsar signal navigation.

A satellite antenna kinetic control system comprises a system setting circuit, a main control unit, a drive and power circuit, a current sensing circuit, a angular position sensing circuit, a rotate speed sensing circuit and a actuator. The main control unit mainly includes a DSP chip and a FPGA chip. The utility model effectively improves the pointing accuracy and the dynamic tracking performance and decreases the cubic capacity and the power consumption of the control system, so as to provide the significant value for the application in the field of the satellite antenna pointing control system.