874 results about "Compensation algorithm" patented technology

A method for controlling and compensating aging in an LED device includes measuring a performance change in light output of the LED device. The LED device is controlled with a first compensation algorithm derived from the measured performance change, during a first period, to effect a luminance change over time in the light output of the LED device. Subsequently, a second compensation algorithm, derived from the measured performance change, and different from the first compensation algorithm, during a second period, effects a second luminance change over time in the LED device's light output. The second luminance change over time in the second period is different from the first luminance change over time in the first period. Furthermore, the first and second periods together are less than the lifetime of the LED device.

The present invention relates to the field of target tracking and more generally to a method employing improved algorithms, which achieve excellent tracking performance for a high-g maneuvering target. The two-model Interacting Multiple Model algorithm and the Interacting Acceleration Compensation algorithm will be modified by introducing adaptive factors through the detection of the normalized innovation squared which is chi-square probability distributed. The implementation results show that the modified algorithms can handle the target sudden maneuver better and are more accurate than the original algorithms.

Disclosed is a dead-time compensation method of a 3-phase inverter using an SVPWM scheme. The dead-time compensation method includes generating a switching signal having dead-time with respect to the power semiconductor switches of the upper and lower arms in order to obtain a predetermined output through the SVPWM scheme, detecting medium phase current from each phase current output through the switching signal, determining polarity of the medium phase current, and generating a switching signal by calculating switching time in order to compensate for time to apply effective voltage according to the polarity of the medium phase current. Through the dead-time compensation method, the distortion of the output voltage and the reduction of voltage having a fundamental wave in the output voltage, which are caused by the dead-time, are minimized through the switching of compensating for the time to apply effective voltage based on the polarity of the load current.

A digital cell phone with built in hearing aid functionality, includes: a housing; a digital signal processor (DSP) contained within the housing for encoding and decoding digital data; a hearing loss compensation module, coupled to the DSP, for processing digital data in accordance with a hearing loss compensation algorithm; a digital-to-analog converter (DAC), coupled to the hearing loss compensation module, for receiving the processed digital data from the hearing loss compensation circuit and converting the data into an analog signal; and a speaker, coupled to the DAC, for receiving the analog signal and converting the analog signal into sound waves adapted for a hearing impaired listener.

The invention discloses a self-adapting analog quadrature modulation unbalance compensating method and a device thereof. The device of the invention comprises a baseband signal module, a DPD module, a self-adapting analog quadrature modulation AQM compensator, a local oscillation (LO) and a RF transmission channel, and a feedback channel. The method of the invention comprises the steps that: an AQM compensation algorithm and a control unit are used for transmitting a training sequence signal to firstly judge whether a DAC is provided with quadrature modulation compensator QMC; then pre-distorted baseband si (t) and a sq (t) signal and baseband IB and a QB signal sent by a feedback loop are obtained, and then measured and compared; the particle swarm optimization (PSO) is applied to continuously adjusting the 6 compensating parameters until a target function reaches the global minimum; at last, a compensating parameter is applied to the QMC unit updated parameter to conduct a dynamic compensating process to the pre-distorted baseband si (t) and sq (t) signals, therefore, the AQM self-adapted unbalance compensation can be realized, and the performance of a broadband digital pre-distorted system is improved.

The present invention provides variable compliance joysticks with mechanical and software customization, and with an integrated control capability, and a method of systematically determining the best mechanical settings and compensatory algorithms to embed in the joysticks to offer an individual with substantial upper extremity motor impairments a personal fit and maximum function. The joysticks may include components for varying the compliance and dampening of the joystick shaft. The method may include providing the user access to operate the joysticks, operatively connecting the joysticks to a driving simulator, displaying an icon on the driving simulator, controlling movement of the icon by the joysticks, evaluating performance of the user based upon the user's ability to control movement of the icon, and modifying hardware settings and software algorithms for the joysticks based upon the evaluation.

The invention discloses a novel dead-zone effect compensation method of an AC servo inverter. The traditional method is not ideal enough to realize accurate dead-zone compensation, and thus a novel online compensation algorithm is provided aiming at the dead-zone effect of the inverter. The novel online compensation algorithm mainly comprises the four steps of: determining generation of a dead zone of the inverter; determining the relationship between the output voltage of the inverter and the actual reference voltage; determining an error voltage; and providing online compensation. The novel online compensation algorithm can save unnecessary power-on and power-off steps of a switching device, is free from any extra hardware circuit and off-line experiment measurement, has the characteristics of simpleness in implementation, low output waveform harmonic content and the like, well solves the output current pulse of a system at low frequency and effectively eliminates the zero-current clamping phenomenon.

The invention provides an impedance control method for a flexibility joint mechanical arm based on a connection and damping configuration, and belongs to the technical field of robot controlling. The problem in a traditional mechanical arm control method that during the flexibility joint mechanical arm control process, due to the fact that the residual oscillation is large, the aim of stable control cannot be achieved is solved. The technical points are that according to a CAD three-dimensional model, a kinetic parameter and a kinematic parameter of the flexibility joint mechanical arm are obtained; according to the parameter identification, a key parameter of a flexibility joint is obtained; a kinetic equation of the flexibility joint mechanical arm is established; a gravity compensation algorithm and an external force compensation algorithm based on the motor position are established; a gravity compensation value and an external force compensation value of the mechanical arm are calculated and obtained; a minimum Hamiltonian function value on the expectation balance position of motor position information is calculated and obtained; an expectation connection matrix and a damping matrix in the impedance control are calculated; an impedance control rule of the flexibility joint based on the connection matrix and the damping matrix are obtained. The impedance control method for the flexibility joint mechanical arm based on the connection and the damping configuration can be used for controlling service robots, medical robots and space robots.

The invention discloses a single-beam unshielded atom magnetometer and a detection method of the single-beam unshielded atom magnetometer. The single-beam unshielded atom magnetometer comprises two sets of triaxial orthogonal coils, wherein one set of triaxial orthogonal coils are used for geomagnetic field coarse compensation and the other set of triaxial orthogonal coils are used for closed loop frequency-division modulation. A single beam of pumped laser passes through a heated alkali metal gas chamber and then is received by a photoelectric detector. The detection method of the single-beam unshielded atom magnetometer comprises the following steps that firstly, a geomagnetic field is counteracted by the triaxial orthogonal coils which are controlled in a feedback mode according to a geomagnetic field coarse compensation algorithm of a micro control unit (MCU), and a weak magnetic field environment is created in the gas chamber; secondly, fine compensation for a residual field is completed according to a closed loop frequency-division modulation algorithm; finally, the feedback amount of geomagnetic field coarse compensation and the feedback amount of closed loop frequency-division modulation are added together, so that the size of an external magnetic field is obtained. The single-beam unshielded atom magnetometer and the detection method of the single-beam unshielded atom magnetometer are high in integration level and sensitivity, and capable of obtaining triaxial magnetic field vector information simultaneously, and having wide application prospects in the fields such as deep space exploration and mineral resource exploration.

The invention discloses a method for precise time synchronization. A time difference between a primary mode device and a secondary mode device is calculated to calculate average path delay; on the basis of the time compensation algorithm, time quantum information needing compensation adjustment currently is calculated; a time adjustment control module is used for carrying out time compensation adjustment processing on the clock secondary mode device, so that time synchronization of all devices in the whole system can be realized. According to the scheme, the special time server is not needed; and the method is suitable for a distributed system.

The invention provides an inertia/astronomy/satellite high-precision integrated navigation system and a navigation method thereof. The inertia/astronomy/satellite high-precision integrated navigation system comprises a sensor module, an integrated navigation resolving module and a real-time display module, wherein the sensor module is sequentially connected in series with the integrated navigation resolving module and the real-time display module and comprises an inertia sensor, a star sensor and a satellite receiver; the integrated navigation resolving module comprises a four-step Runge-Kutta strapdown navigation resolving module, an astronomy attitude determination resolving module, an unequal-interval Kalman filtering module and a position and speed compensation algorithm module; and the real-time display module comprises a three-dimensional real-time display module. The navigation method realizes the real-time acquisition of sensor data, utilizes the inertia sensor data to carry out strapdown navigation resolving based on a four-step Runge-Kutta algorithm and can carry out the integrated navigation resolving on the inertia sensor data, star sensor data and satellite receiver data and carry out the real-time three-dimensional display on an integrated navigation result by utilizing a projection algorithm.

The invention relates to the relevant technical field of pressure characteristic value acquisition of pressure sensors, in particular to a method and a system for acquiring a pressure characteristic value of a pressure sensor with a nonlinear temperature compensation algorithm. The method includes the steps: sampling the pressure characteristic value of the pressure sensor to obtain a pressure characteristic value D; calculating a temperature drift correction coefficient delta t related with the outside temperature according to the outside temperature; and calculating a corrected value D+delta Dt of the pressure characteristic value. The sensor is calibrated by an upper computer, the upper computer makes a data sheet according to a series of data measured at different temperatures and under different pressures in calibration as the upper computer can execute large-scale computation, a calculating parameter for calculating the pressure value can be rapidly found in an EEProm (electrically erasable programmable read only memory) sheet according to signals measured by a temperature sensor and the pressure sensor when a lower computer is used for measurement, and an accurate pressure value is obtained by calculating. As the temperature drift correction coefficient is added, acquisition accuracy of the pressure characteristic value is remarkably and particularly improved by the aid of a one-step compensation method in a high-temperature area and a low-temperature area.

Compensation algorithms are applied to hide failed nozzles or, at least, reduce the objectionable effect of such nozzles in a printed image. Once a failed nozzle or under-performing nozzle is detected in a single-pass printing system, it is shut-off and the image data that was intended to be printed by this nozzle is redistributed to its neighboring nozzles. Embodiments of the invention use of a 1-D look-up table and stochastically distribute the duty cycle to each neighboring nozzle. In this way, failed nozzles are effectively hidden in the final print.

The invention relates to a biomedicine missing data compensation method based on an EM cluster-BP neural network and belongs to the technical field of biomedicine. According to the method, an iterative algorithm EM algorithm which is important in processing incomplete data problems is adopted, different missing data are partitioned in different clusters according to an EM cluster and primary compensation is completed; and models are established for complete data in each cluster through a BP neural network method and precise compensation of the missing data in each cluster is finished. According to the biomedicine missing data compensation method, adaptability of a compensation algorithm to any missing mechanism is enhanced to a certain degree, accuracy of compensation is improved and the method is suitable for the biomedicine missing data compensation field.

The invention discloses an increment compensation dynamic adaptive enhancement-based fault diagnosis method. The method comprises the following steps of 1, collecting vibration signals in various states for a vibration sensor at a driving end of a motor; 2, preprocessing fault data of a bearing device; 3, adding a training sample into a random noise to serve as an input of a denoising autocoder to perform unsupervised greedy layer-by-layer pre-training; 4, when new device state data exists, performing new fault mode extraction by using an existing trained DAE model, performing similar mode comparison by utilizing a mode similarity algorithm, performing increment combination on new fault modes by adopting an increment active fusion algorithm, and calculating dynamic weighting by utilizing a weight dynamic compensation algorithm; 5, training an SVM classifier by taking labeled fault data and unlabeled fault data subjected to dynamic deep learning training weighting as input vectors; 6, performing global fine adjustment on related parameters in the whole model by utilizing a BP algorithm; and 7, performing classification diagnosis of fault types.

A system and method for motion compensation of color sequential displays, receiving a motion image data input, extracting an estimate of a motion of an image portion represented in said image data input with a motion estimator, and calculating, for a time instance of display of each image subframe of an image frame, a compensated representation for reducing display artifacts with a processor, wherein each subframe represents a different aspect of the image frame. The subframes are preferably different color planes of the image frame. The processor preferably performs a bilinear interpolation where the compensated image boundary does not fall on a display pixel boundary. The motion compensation algorithm is preferably robust in the face of erroneous motion vectors. The system and method is advantageously used in single panel liquid crystal display projection systems, although the techniques are applicable to various image display technologies.

A digital timing read back and an adaptive feedforward compensation algorithm to reduce harmonic distortion is disclosed. More specifically, the approach generates harmonic components digitally with the same magnitude but at an opposite phase to the output harmonic distortion. An anti-distortion signal is generated and added to the input signal. The magnitude and phase of the harmonic distortion change with the modulation level or index and the frequency of the input signal. In addition, the harmonic distortion level varies significantly with different timing error statistics in different power devices. The inventive method takes the modulation level or index, the frequency of the input signal and the timing error statistics acquired through a digital read back circuit as input variables to determine the magnitude and phase of the anti-distortion signal.

The invention relates to a phase extraction method for a phase-shifting interferometric fringe. Phase measurement error is in sine periodic distribution, while each phase of a trigonometric function has opposite positive and negative amplitudes every pi, namely the error distribution is in revert phase. Therefore, a basic algorithm can be expanded, numerators and denominators in arc tangent formulae in multiple measurement groups are subjected to overlapping average respectively, and errors are reduced by utilizing mutual cancellation of error phase distribution. On the basis of the idea, a plurality of average compensation algorithms of different situations can be deduced. The algorithm is particularly insensitive to phase displacement errors, and the phase measurement accuracy can be remarkably improved.