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291 results about "Offset calibration" patented technology

Zero offset calibration is the process in which the zero offset value is updated for the power meter. This is an important process as it ensures the power meter has an up to date value for 0 or no load on the power meter. Depending on the head unit used, this process may be referred to as calibration or zero reset.

Base station interference control using timeslot resource management

A personal base station configured to connect to the Internet and establish a small area of wireless coverage including means for controlling interference with neighboring personal base stations using a timeslot management mechanism. Timeslot management mechanisms include timeslot interference detection, timeslot power reduction, timeslot allocation, timeslot offset calibration, and timeslot synchronization management that minimizes the number of frequencies required to control inter-cell interference between neighboring personal base stations.
Owner:INTEL CORP

Calibrating multi-dimensional sensor for offset, sensitivity, and non-orthogonality

A multi-dimensional sensor, a magnetometer or accelerometer, is calibrated based on the raw data provided by the sensor. Raw data is collected and may be used to generate ellipse or ellipsoid parameters, for a two-dimensional or three-dimensional sensor, respectively. An offset calibration factor is calculated based on the raw data, e.g., the determined ellipse or ellipsoid parameters. A sensitivity calibration factor is then calculated based on the offset calibration factor and the raw data. A non-orthogonality calibration factor can then be calculated based on the calculated offset and sensitivity calibration factors. Using the offset, sensitivity and non-orthogonality calibration factors, the raw data can be corrected to produce calibrated data.
Owner:QUALCOMM INC

Signal processing semiconductor integrated circuit device and wireless communication system

The invention provides a signal processing semiconductor integrated circuit of the direct conversion system, which includes a dummy amplifier having the same circuit configuration as a low noise amplifier being the first stage amplifier, in which the DC offset calibrations on the subsequent stage amplifiers are carried out during shifting into the reception mode in a state that the low noise amplifier is deactivated and the dummy amplifier is activated. Thereby, the invention achieves to suppress generation of the DC offsets resulting from the leakage noises of the local oscillator during shifting into the reception mode, and to enhance the reception sensitivity.
Owner:RENESAS ELECTRONICS CORP

Multi-temperature programming for accelerometer

ActiveUS20070204672A1Improves manufacturing test throughputImprove overall manufacturing test throughputAcceleration measurementThermometer testing/calibrationTemperature coefficientOffset calibration
A system and method for testing and calibrating integrated sensor devices that improves the manufacturing test throughput of the devices. The system includes a tester, a temperature controller, and at least one probe station including a thermal chuck. The chuck can be heated to specified temperatures to achieve variable heating of a wafer, PCB, or pallet disposed thereon. The temperature controller adjusts the temperature of the chuck to a first specified level. The tester performs at least one first measurement of the output offset of each integrated sensor embodied as a die on the wafer, or as a device on the PCB or pallet. Next, the temperature controller adjusts the temperature of the chuck to a second specified level, and the tester performs at least one second measurement of the output offset of each integrated sensor at the second temperature level. The offset temperature coefficient (OTC) of each sensor is calculated based upon the output offset measurements performed at the first and second temperature levels, and optimal settings for calibrating the respective sensors are determined based upon the calculated OTC values. After the temperature of the chuck is brought back down to the first specified level, the tester programs the output offset calibration settings into each sensor.
Owner:MEMSIC

Infrared two-point non-uniform calibrating method based on frame black body field diaphragm

The invention relates to an infrared two-point non-uniform calibrating method based on a frame black body field diaphragm, belonging to the field of infrared thermal imaging. The method comprises the following steps of: arranging an automatically-telescopic frame black body field diaphragm on a diaphragm of an infrared thermal imager and performing two-point calibration under a frame to obtain a gain calibration factor and an offset calibration factor of a detection unit under the coverage of a frame black body; acquiring f frames of initially-calibrated images respectively on two scenes to obtain f-1 groups of inter-frame displacement parameters on every scene; and acquiring calibration parameters of f-1 groups of images with inter-frame displacement on an internal detection unit by adopting an algebraic method, and averaging the frames to obtain finial calibration matrixes G and 0 for calibrating the entire field of a subsequent infrared video. The method has the advantages of rapidness, self-adaption and system miniaturization, and can be applied to the fields of designing, production and manufacturing of refrigerating and non-refrigerating infrared focal plane detector thermalimaging systems, satellite infrared thermal imaging systems, infrared alarm systems, scientific researches and the like.
Owner:BEIJING INSTITUTE OF TECHNOLOGYGY

Limit-cycle oscillation (LCO) based switch-mode power supply (SMPS) response evaluation

A limit-cycle oscillation (LCO) based switch-mode power supply (SMPS) response evaluation provides an effective mechanism for determining the characteristic response of an SMPS during normal operation of the SMPS. LCOs are induced in the SMPS loop by introducing a non-linearity in the loop, for example, decreasing the resolution of a pulse-width modulator that controls the SMPS switching circuit. The frequency and amplitude of the LCOs are determined and used to evaluate the characteristic response of the SMPS. In order to produce symmetric LCOs, which are more easily modeled, a zero-offset calibration circuit adjusts values provided to the pulse-width modulator, so that each value introduced during calibration is at the midpoint of a resolution cell. The frequency can be measured by counting between zero-crossings of the LCOs and the amplitude measured by capturing the LCO values immediately prior to each zero-crossing of a first difference of the LCO samples.
Owner:MAXIM INTEGRATED PROD INC

Sensor offset calibration using map information

Systems, processes, and techniques for calibrating an onboard sensor of a vehicle are presented here. The vehicle has a control system that is capable of performing at least some of the tasks related to the calibration procedure. An exemplary methodology collects vehicle status data and obtains navigation map data during operation of the vehicle. A current calibration factor is calculated for the onboard sensor, based on the collected vehicle status data and the obtained navigation map data. More specifically, the vehicle status and navigation map data can be used to determine when the current conditions are suitable for performing calibration. When the current conditions are satisfactory, the calibration factor is calculated. Thereafter, the onboard sensor can be calibrated in response to the current calibration factor.
Owner:GM GLOBAL TECH OPERATIONS LLC

Combined calibration method for EPS zero offset and multi-line laser radar

The invention relates to a combined calibration method for an EPS (Electric Power Steering) zero offset and a multi-line laser radar. The method comprises the following steps: obtaining current position information, yaw angle information, and a reference path of a vehicle; calculating a lateral offset distance of the vehicle and the reference path; performing zero-offset calibration on the EPS; calculating an included angle and a distance between the ground plane and a plane crossing an origin to obtain an rotation angle of a laser radar coordinate system relative to a vehicle body coordinatesystem along the x axis and the y axis, and a shift amount along the z axis; performing linear driving on the vehicle after EPS zero offset calibration taking the wheel angle as zero degree to generate a first trajectory; generating a second trajectory according to laser point cloud data in the vehicle driving process; calculating the included angle of the first trajectory and the second trajectory to obtain the rotation angle of the laser radar coordinate system relative to the vehicle body coordinate system along the z-axis; and calculating a position deviation between a starting point of the first trajectory and the starting point of the second trajectory to obtain the shift amount of the laser radar coordinate system relative to the vehicle body coordinate system along the x-axis and the y-axis respectively.
Owner:BEIJING ZHIXINGZHE TECH CO LTD

ATM self-service business hall behavior analysis method based on depth information

The invention relates to an ATM self-service business hall behavior analysis method based on depth information. Behavior analysis based on common two-dimensional cameras is adopted in the prior art, and the situation that targets cannot be accurately positioned exists. According to the ATM self-service business hall behavior analysis method, firstly, binocular cameras are adopted for serving as acquisition equipment for the depth information, background modeling is carried out on depth maps, a Gaussian mixture model of each pixel is learned and updated, and background distribution is determined; secondly, the probability value of each pixel in each new depth map is worked out, and clustering segmentation is carried out on a front depth map according to the DENCLUE algorithm; finally, pixels in each human body region in each camera are projected onto the ground, association of projected targets is carried out by using multi-camera offset calibration, and therefore target detection under the multiple cameras is achieved under a global coordinate system. The depth information is used and background modeling of RGB information is combined, so that the stability of target detection is greatly improved, and a good basis is provided for following behavior analysis.
Owner:ZHEJIANG ICARE VISION TECH

Offset calibration circuit for comparer in asynchronous successive approximation register analog-to-digital converter

The invention discloses an offset calibration circuit for a comparer in an asynchronous successive approximation register analog-to-digital converter. The offset calibration circuit comprises a calibration clock generation module, a basic dynamic comparer with calibration pair transistors, a calibration signal generation circuit, a calibration control circuit and a comparer clock selection circuit. The calibration clock generation module is used for generating a global clock control signal for controlling offset calibration of the dynamic comparer. The basic dynamic comparer with calibration pair transistors comprises a basic single-level dynamic comparer, the calibration pair transistors connected with input pair transistors in parallel, a first switch S1 and second switch S2. The calibration signal generation circuit is used for generating a gate control voltage Vcal for one MOS transistor in the calibration pair transistors. The calibration control circuit is used for generating a control signal for the calibration signal generation circuit. The comparer clock selection circuit is used for generating a comparison and reset clock CK of the dynamic comparer. The offset calibration circuit is applied to offset calibration of the comparer of the asynchronous SAR ADC in a SoC system and is convenient and efficient.
Owner:SOUTHEAST UNIV

Vehicle, and method and system for automatically calibrating zero offset of steering wheel of vehicle

An embodiment of the invention relates to the technical field of automatic driving, and discloses a vehicle, and a method and a system for automatically calibrating zero offset of a steering wheel ofthe vehicle. The method includes judging whether the vehicle is in straight driving states in current sampling time intervals or not; determining that the current sampling time intervals are current calibration time intervals if the vehicle is in the straight driving states, and acquiring steering angles of the steering wheel of the vehicle when the vehicle is in the straight driving states; acquiring historical zero offset calibration results; calculating real-time zero offset calibration results of the steering wheel of the vehicle according to the historical zero offset calibration resultsand zero offset calibration results, which correspond to the current calibration time intervals, of the steering wheel of the vehicle. The steering angles are used as the zero offset calibration results, which correspond to the current calibration time intervals, of the steering wheel of the vehicle. The vehicle, the method and the system in the embodiment of the invention have the advantages thatthe zero offset of the steering wheel of the vehicle which is currently automatically driven can be automatically calibrated by the aid of the method and the system, and the zero offset measurement accuracy of the steering wheel of the vehicle can be improved.
Owner:GUANGZHOU XIAOPENG MOTORS TECH CO LTD
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