49results about How to "Requirement to reduce computing speed" patented technology

The invention discloses an asynchronous motor model predictive control method based on an extended control set, which relates to the technical field of asynchronous motor. The discretization mathematical model and full-order observer mathematical model of asynchronous motor are established, and the collected signals are substituted into the model. The model is compensated for the time delay. The objective function of electromagnetic torque and flux linkage of induction motor is constructed. Expanding the voltage vector; Selection of optimal voltage vector; According to the switching state andduty cycle of the switching transistor corresponding to the selected optimal voltage vector, the on-time of the switching transistor is obtained, the value of the comparison register is updated, and the switching signal of the inverter is generated by the digital signal processor to complete the generation of the voltage vector modulation signal of the inverter. The advantages are that the controlset is extended, the problem of large torque ripple is solved, and the stability of steady-state operation of the system is improved.

The invention belongs to the technical field of wireless charging and particularly relates to an electric automobile two-way wireless charging system transmission power control method. The method includes the following steps that the mutual inductance between a primary coil and an secondary coil of a system is calculated, and an inward-shifting phase angle of a primary convertor and a secondary convertor is obtained through calculation according to an output power command value; a primary controller and a secondary controller correspondingly adjust the phases of bridge arm switching signals inthe primary convertor and the secondary convertor with corresponding clock signals as standards, and control over the direction and the size of the transmission power is uncoupled; and the extreme value of the output current is tracked, so that the phases of control signals of the primary convertor and the secondary convertor are synchronous, and the direction of the system transmission power iscontrolled. The problem that an outward-shifting phase angle is unknowable and uncontrollable due to communication delay is solved, control over the direction and the size of the transmission power isuncoupled, phase information of the high-frequency current in the primary coil and the secondary coil is not needed, the circuit design difficulty and the requirement for the arithmetic speed are reduced, cost is reduced, and anti-interference performance and reliability are improved.

A camera tracking apparatus for calculating in real time feature information and camera motion information based on an input image includes a global camera tracking unit for computing a global feature map having feature information on entire feature points; a local camera tracking unit for computing in real time a local feature map having feature information on a part of the entire feature points; a global feature map update unit for receiving the computed feature information from the global and local camera tracking units to update the global feature map; and a local feature selection unit for receiving the updated feature information from the global feature map update unit to select in real time the feature points contained in the local feature map. The local camera tracking unit computes the local feature map for each frame, while the global camera tracking unit computes the global feature map over frames.

The invention discloses a parallel type energy feedback elevator system comprising a variable frequency driving main loop of an elevator, an energy feedback device and a controller, wherein the variable frequency driving main loop consists of an uncontrollable rectifier bridge module, a direct current bus capacitor and an inverting power module; the energy feedback device consists of a boosting and filtering device, a PWM rectifier module, a direct current bus capacitor and a power diode module; the input end of a three-phase power supply is provided with two current sensors; a three-phase input power end of a motor is provided with two current sensors which are used for providing current feedback signals for the controller respectively; the controller is used for providing PWM control signals for the inverting power module and the PWM rectifier module and directly controlling the on and the off of a switch thereof; and the power diode module consists of two power diodes which are serially connected at the positive side and the negative side of a direct current bus. The energy feedback elevator system can reduce the capacity by half, simultaneously restrict the circulating current in the circuit well, and can realize the purposes of energy saving, environment production and cost reduction.

The invention discloses an intelligent tracking and monitoring system based on RFID label signal intensity. The intelligent tracking and monitoring system based on RFID label signal intensity is characterized by comprising a tracking and monitoring area, an active RFID label worn by a person or an object, tracking network cameras, RFID readers, a network interchanger and a PC server, wherein the tracking network cameras and the RFID readers are distributed above the tracking and monitoring area in a grid shape, and the rectangular area defined by the four RFID readers on the outermost portion forms the tracking and monitoring area. The intelligent tracking and monitoring system based on RFID label signal intensity analyzes the movement trend by collecting the changes of the signal intensity of the 2.4GHz active RFID label worn by the person or the object and correspondingly controls a camera cloud deck, thereby accurately realizing tracking and monitoring.

The invention discloses a cell empty carport identification system based on RFID signal intensity and assistant camera video, which comprises cell roadside carports, active RFID tags distributed at the roadside carports, monitoring cameras, an RFID reader, a network switch and a PC server, wherein the active RFID tags are distributed at the roadside beside the carports; the RFID reader is distributed at the roadside opposite to the cell roadside carports and is provided with an Ethernet interface; and the tracking network cameras are provided with Ethernet interfaces and connected with the PC server via the network switch. The 2.4 GHz RFID reader reads changes of RSSI values of the RFID tags arranged at the roadside beside the carports, and with the help of video analysis of the cell monitoring cameras, empty carports at the roadside can be accurately and quickly identified.

The invention provides an optimal attitude solving method for bionic navigation, and belongs to the technical field of polarized light navigation attitude solving. In this method, a polarization vector and a gravity vector are used to construct a target error function model, and an optimal attitude quaternion is solved according to different motion states, so as to improve attitude solution accuracy under a complex maneuvering condition. According to the method provided by the invention, the heading information compensation correction of an unmanned aerial vehicle is realized by solving a polarization azimuth angle error searching direction, and the problem of angle ambiguity caused by direct solution is avoided. A polarized light navigation scheme designed by the invention decouples a solving process of heading and horizontal attitude to overcome spatial position constraint of attitude solving, and simultaneously a gradient optimization method with variable search factors is adopted,so that the step size in search can be changed in real time according to different motion states of the aircraft, and measurement accuracy and robustness of a polarized light navigation system are improved.

Systems and methods for MD simulation with significantly increased multithreaded parallelism. A substance body is divided into a plurality of cells. With respect to a current center cell, its neighbor particles can be partitioned into groups with groups processed in sequence by a dedicated CTA that comprises a plurality of warps. Within each CTA, each warp is assigned to process in parallel for a center particle in the center cell to calculate interaction forces between the center particle and the group of neighbor particles. Moreover different levels of the memory hierarchy in a system, including local memories, shared memories and global memory, are used to store intermediate and final results respectively.

The invention belongs to the technical field related to robot control and discloses a track planning method for a mechanical arm. The track planning method comprises the following steps: acquiring such tail-end-related parameters, including initial pose, terminal pose, preset track, initial joint vector and terminal joint vector of the mechanical arm; choosing a series of feature points on the preset track, and marking the current feature point pose, the current feature point joint vector, the next feature point pose and the next feature point joint vector; calculating the next feature point joint vector and the current feature point joint vector, executing joint space track planning treatment and planning sub-algorithm treatment according to calculation results to acquire a more optimal track plan; and performing cyclic treatment on the rest feature points according to the processes till the tail end of the mechanical arm reaches the terminal pose. According to the track planning method, the overall calculated amount can be greatly reduced, calculation errors are reduced, and meanwhile, the track planning efficiency is remarkably improved.

The invention relates to an in-cavity self-adaptive optical beam purification system and a method. The self-adaptive optical beam purification system consists of a parallel light source, a deformable mirror, a Hartmann sensor, a data acquisition and control computer, a high-voltage amplifier, a spectroscope, a focusing lens, a beam quality diagnosis camera and a laser device. During beam purification, the prior surface shape of the deformable mirror is preset at first via the Hartmann sensor, and then the beam is purified in a random optimization control method. By adopting the method, prior data can be utilized effectively, the time for purification of the beam in the cavity can be greatly reduced, and the control stability of the in-cavity beam purification system can be improved.

The invention provides an inductosyn angle measurement error analysis and compensation method and belongs to the technical field of detection. The method comprises: using a high-precision single-axistest rotary table as an angle measurement reference and using the least squares identification method to analyze respective harmonics of the angle measurement of the inductosyn; making targeted hardware adjustment according to an analysis result; acquiring error data again as a compensation sampling point, and using the linear interpolation method to compensate the angle measurement error software. The method solves the problems that the existing inductosyn analysis and compensation method is incomprehensive in analysis, unsatisfactory in compensation effect, limited in the number of samplingpoints, low in efficiency, and difficult in model creation.

The invention belongs to the technical field of fault diagnosis of DC power network, in particular to a single-terminal quantity protection method of ring-shaped flexible power network line. The method comprises the following steps: measuring voltages of two terminals of additional inductors at the installation position of DC power line protection; The equivalent model of post-fault converter is established. The MMC is equivalent to the series circuit of capacitor and inductor, and the VSC and DCT are equivalent to the parallel capacitor on the DC side. The complex modulus network of DC line based on 0-modulus and 1-modulus is established. The initial value of the additional inductance voltage after the fault is obtained by solving the complex modulus network of the DC line. The relationship between the initial value of the additional inductor voltage and the fault types in and out of the region is obtained. The fault location identification criterion based on the initial value of additional inductance voltage is established and the fault location identification threshold is adjusted. Based on the initial value of the additional inductor voltage, the fault pole judgment criterion and the fault pole judgment threshold are established. Single-ended electrical quantity is used to identify faults quickly and accurately, and communication is not needed, and the reliability is high.

A fan module, disposed inside a case of an electronic device, includes a case body, a blade assembly, a stopping plate and an adjusting element. The case body, including a first case unit, a sidewall and a second case unit, forms an accommodating space. The first case unit or / and the second case unit has an air inlet. The sidewall has an air outlet and an adjusting opening. The blade assembly is disposed inside the accommodating space. The stopping plate, disposed on the sidewall, is for opening or closing the adjusting opening. The adjusting element is movably disposed on the stopping plate and for pressing against the stopping plate. When the adjusting element moves from a first position toward a second position, the adjusting element pushes against and makes the stopping plate to be offset toward the blade assembly, and produces a gap between the stopping plate and the sidewall.

The invention discloses a structural optimization method for a parallel load distribution type six-component force sensor. The parallel load distribution type six-component force sensor takes a central bearing beam as a load auxiliary support and the bearing capacity of the sensor can be greatly improved. Based on the condition that the parallel branched-chain force is fixed in the parallel six-component force sensor, the mutual influence rule of the range and structural parameters of the sensor is researched. According to the structural optimization method for the parallel load distribution type six-component force sensor provided by the invention, the maximum branched-chain bearing capacity of each branched chain in a safe working state is taken as a condition, the range of the six-component force sensor is used as a basic value at the moment, the central bearing beam and branched chain parameters are changed to obtain a new range of the sensor, and the structural parameters of the sensor are optimized by establishing a comprehensive incremental range model of the sensor. Compared with a traditional sensor structural optimization method, on the one hand, the parameter design of the central bearing beam is facilitated, so that the bearing requirement of the sensor is met; and on the other hand, the branched chain parameters of the sensor can be properly adjusted for optimization for the bearing requirement.

The invention provides a temperature compensation method and device of a silicon-sapphire pressure sensor. In the method, by combining temperature drifting characteristics of a silicon-sapphire pressure sensor, a compensation algorithm combined with least squares linear fitting and parabola interpolation is designed, so compared with the traditional linear compensation algorithm, the pressure temperature relation curves obtained in the method are quite close to the actual pressure temperature change rule, a problem of quite big compensation error existing in the traditional linear compensationalgorithm is well solved and quite good compensation effects are achieved. The invention also provides a compensation device. By integrating the pressure sensor and the temperature sensor, on one hand, a sensor structure is simplified, and on the other hand, compared with a split structure, the measured temperature is quite close to the actual working temperature of the pressure sensor, so the device has good compensation effects.

The invention discloses a few-mode pre-amplification coherent receiving system and method for a free space optical signal. The system comprises a coupling lens, a few-mode optical fiber, a few-mode erbium-doped optical fiber amplifier, an optical band-pass filter, a local oscillator laser, a spatial optical coupler, a multi-mode optical detector, an analog-to-digital converter and a digital signalprocessing system. An incident light signal is coupled into the few-mode optical fiber through the coupling lens and is input into the few-mode erbium-doped optical fiber amplifier. A few-mode optical signal generated after amplification is filtered by an optical band-pass filter and then combined with local oscillation light through a spatial optical coupler to form a pseudo single sideband signal. And finally, after analog-to-digital conversion of the analog-to-digital converter and processing of the digital signal processing system, an input signal light field is reconstructed, and the influence of inter-mode dispersion is eliminated. The system has the advantages of being high in optical signal coupling efficiency, high in sensitivity, simple in structure and the like.

The invention discloses a lawn mower control system. The system comprises a camera module, a radar module, a plurality of contact pressure sensors, a plurality of infrared sensors, a control module, aremote control terminal and a communication module, wherein the camera module is used for shooting a path image in front of a lawn mower; the radar module is used for detecting obstacles in the pathin front of the lawn mower, the plurality of contact pressure sensors are distributed around the lawn mower and used for detecting objects making contact with the lawn mower; the plurality of infraredsensors are distributed around the lawn mower and used for detecting life bodies close to the lawn mower; the control module is in communication connection with the camera module, the radar module, the contact pressure sensors and the infrared sensors and used for performing planning control on the advancing path of the lawn mower; the remote control terminal is in communication connection with the control module and used for processing non-real time large computation data tasks; the communication module is used for communication connection between the control module and the remote control terminal. Defects in the prior art can be overcome, and accurate path planning for the lawn mower and avoidance of obstacles can be realized on the premise that the hardware cost is not increased substantially.

The invention discloses an implementation method of a high-accuracy three-spectrum colorful star sensor, relates to a star sensor technology and aims at solving the problems in the prior art that when a single-chip CMOS is used for receiving an image of a colorful star map, the image mass center accuracy is influenced, with a conventional star sensor lens, a great color difference is generated and matching accuracy is influenced, etc. Through the implementation method of the high-accuracy three-spectrum colorful star sensor, a star map is obtained by a high-resolution and high-sensitivity CMOS detector; based on the fact that multiple stars are needed for star matching performed with a star angular distance in the prior art, spectral characteristics of fixed stars are used for identifying the colorful star map so as to reduce the number of stars observed in the field of view; aiming at solving the problem of low mass center accuracy of a three-color star map obtained by a single colorful CMOS chip, three CMOS sensors are respectively used for obtaining the three-color star map. The implementation method of the high-accuracy three-spectrum colorful star sensor has the advantages of being high in accuracy, high in anti-interference performance, capable of independently navigating by being independent of other systems, etc.

The invention discloses an automobile anti-collision system and control method based on a laser radar. The system comprises a laser radar detection unit, a signal processing circuit, and a hydraulic electromechanical braking device. The signal processing circuit comprises an analog circuit, a digital circuit part, and parameter adjustable software. The system can enable a driver to accurately avoid obstacles, is small in judgment error, is slow in distance measurement, and is high in intelligentization degree. The system carries out the processing of the relative tracks of the obstacles and an automobile in a nonlinear manner, thereby enabling the collision prediction to be more accurate, solving a problem of the contradiction between the dual control of the system and the driver, and guaranteeing the continuity and mobility.

The invention discloses an impedance matching network and a self-adaptive impedance matching device and a method thereof, the impedance matching network is composed of a variable capacitor and a variable inductor, the variable capacitor is composed of at least two capacitors connected in parallel, the capacitance values are gradually reduced, and the maximum capacitance value is determined by the variable capacitance change range; the variable inductor is composed of at least two inductors connected in series, inductance values are gradually decreased, and the maximum inductance value is determined by the variable inductor change range. The self-adaptive impedance matching device comprises a sampling module, the impedance matching network and a controller, the controller executes calculation of load impedance after receiving a sampling signal, so that the characteristic parameters of the impedance matching network corresponding to the impedance matching state are determined, the impedance matching network is adjusted according to the characteristic parameters, and impedance matching is achieved. The impedance matching network and the adaptive impedance matching device have the advantages of wide matching range, high matching precision and flexibility, high reliability, low cost, fast response, simple implementation mode and the like.

The invention discloses a high-voltage direct-current transmission line lightning stroke interference identification method based on a current attenuation ratio, and the method comprises the steps: carrying out the phase-mode transformation of a rectification side positive and negative current signal fault component in a data window T with a certain length (usually 0.8-1ms), and obtaining a line-mode current fault component; secondly, solving a maximum value of an absolute value of a line mode current fault component, an absolute value integral of the line mode current fault component and a nominal average value of the line mode current fault component in sequence; and finally, calculating a line mode current fault component attenuation ratio, comparing the line mode current fault component attenuation ratio with a threshold value, and judging lightning stroke interference or faults. The lightning stroke interference can be accurately identified, and the reliability of the ultrahigh-speed transient state quantity protection of the direct-current line is improved.

The invention discloses a video compression remote transmission system for feeding back coarse quantization reconstructed frames, comprising an information source and an information sink. The information source comprises an information source video encoder, a forward direction transmission transmitter and a reverse direction feedback receiver, wherein the forward direction transmission transmitter and the reverse direction feedback receiver are both in connection with the information source video encoder. The information sink comprises an information sink video decoder, a forward direction transmission receiver, and a reverse direction feedback transmitter, wherein the forward direction transmission receiver and the reverse direction feedback transmitter are both in connection with the information sink video decoder. The forward direction transmission transmitter is in connection with the forward direction transmission receiver; the reverse direction feedback transmitter is in connection with the reverse direction feedback receiver. The video compression remote transmission system feeds back reconstructed video frame information of a remote video decoder on a reverse direction channel, allowing local video decoder reconstructed frames in a local video encoder to be simultaneous with remote video decoder reconstructed frames; the coarse quantization of a transmission data rate is conveniently reduced, and a coarse quantization method is employed for reconstructed frame feedback to reduce a required data rate, thereby reducing the requirement for a decoder operation speed.

The invention discloses a ship radar system on the basis of network transmission. The ship radar system comprises a host unit, a receiving and transmitting unit and an antenna unit. The host unit is mounted in a cab and is used for controlling radar; the receiving and transmitting unit is mounted at a high location outside a ship, is electrically connected with the host unit and is used for carrying out data interaction with the host unit; the antenna unit is mounted at a high location outside the ship, is electrically connected with the receiving and transmitting unit and is used for transmitting electromagnetic waves and receiving echo signals from target objects. The ship radar system has the advantages that the requirements of the host unit on the computation speeds of devices can be lowered, accordingly, pictures are smooth, and echo picture details are easy to present; software and hardware platforms can be provided to multi-radar networked management by the aid of network transmission.

The invention relates to a double-closed-loop direct current motor control circuit, and belongs to the field of motor control. The double-closed-loop direct current motor control circuit comprises anuncontrollable rectifying circuit, a revolving speed setting and proportional-integral circuit, a current loop proportional-integral circuit, a motor H bridge control circuit, a high-power thyristor drive circuit and a PWM generating circuit. The revolving speed setting and proportional-integral circuit, the current loop proportional-integral circuit, the PWM generating circuit, the high-power thyristor drive circuit and the motor H bridge control circuit are sequentially connected, and the uncontrollable rectifying circuit and the motor H bridge control circuit are connected. Through samplingfeedback of the revolving speed and currents of a motor, the revolving speed loop and current loop double-closed-loop control circuit is used for controlling the direct current motor, the control difficulty of a control chip is greatly lowered, the control precision is improved while energy consumption is reduced by means of double-closed-loop control, and therefore the requirement on the operating speed of the chip is also reduced.

The invention discloses a picture integrity checking method, a communication device and a capsule endoscope system. The picture integrity checking method includes the steps that S1, a sending terminaldivides pictures to be sent into a plurality of data packets, and all or part of each data packet is checked through a first algorithm, and all or part of obtained verification results are taken as afirst check value of the whole pictures to be placed at the position agreed with a receiving terminal in the pictures to be sent; and S2, the receiving terminal reorganizes the pictures based on thedata packets, checking is carried out according to the algorithm and sequence same as the sending terminal on the content of each data packet in the reorganized pictures and a second check value is obtained, the second check value and the first check value are compared and whether the second check value and the first check value are same or not is determined, and if the second check value and thefirst check value are same, the image data are considered complete. The method not only checks the content in each data packet, but also checks the combination and combination order of each data packet, the failure of a screen caused by the wrong combination and combination order of the data packets is effectively avoided, and the image display quality of the receiving terminal is improved.

The invention discloses an inductive current estimation method for a DC-DC switching power supply. A voltage sampling module, a data conversion module, a switching signal counting module, an inductive voltage calculation module and a digital filter module are included. The input voltage and the output voltage pass through the voltage sampling module and the data conversion module to obtain converted input voltage and converted output voltage with the same digit; the node voltage is compared with the reference voltage, and then the duty ratio is obtained through the switching signal counting module; the inductance voltage calculation module outputs the average value of the voltages at the two ends of the inductance and the parasitic resistor, and the estimated inductance current is finally obtained through the digital filter module; the real-time inductive current can be accurately estimated under the condition that only input and output voltages are sampled, additional analog sampling circuits such as resistors, capacitors and operational amplifiers do not need to be added, a high-speed ADC far higher than the switching frequency is not needed, the cost can be reduced, the circuit size is reduced, and high universality is achieved.