Provided herein is a system and method for determining whether a sensor is calibrated and recalibrating of an uncalibrated sensor. The system comprises a sensor system comprising a sensor and an analysis engine configured to determine whether the sensor is uncalibrated. The system further comprises an error handling system configured to determine whether to perform a recalibration in response to the sensor system determining that the sensor is uncalibrated. The error handling system further comprises a recalibration engine configured to perform a recalibration.

To provide a rotation angle sensor which outputs N periods (N>1) of a first signal of a first phase and a second signal of a second phase forming a predetermined phase angle with the first phase per single rotation of a rotating body. The rotation angle sensor includes a calibration parameter calculating part which calculates, in a mechanical angle of one angular range having a first mechanical angle different from a reference mechanical angle as its starting point, based on the first signal and the second signal, a calibration parameter which calibrates an error in a moving radius of the rotating body in the reference mechanical angle of the rotating body. The one angular range may have the first mechanical angle as its starting point and a second mechanical angle as its ending point.

A position sensing device for measuring a position, comprises a position sensing device for measuring a position; a plurality of sensors arranged to produce sense signals each being a function of an input phase representative of a position to be measured; a combiner circuit arranged to generate an error signal by combining the sense signals according to an array of weight factors; a processing block including a loop filter to filter the error signal and arranged to output a phase value representative of the position; and a feedback loop comprising a feedback signal unit arranged for receiving the output phase value and for adjusting based on the received output phase value of the array of weight factors.

Technology for performing magnetic field gradient measurements is described. The magnetic field gradient measurements for specific positions on the Earth can be performed from a moving platform. The magnetic field gradient measurements can be identified as being affected by a level of error that exceeds a defined threshold. A correction value can be generated to compensate for the error in the magnetic field gradient measurements. The correction value can be applied to the magnetic field gradient measurements in order to obtain magnetic field gradient measurements with a reduced level of error.

A self-calibration method for positioning of a light fixture includes steps of: S1. setting a plurality of preset positioning reference points around the circumference of the absolute encoder; driving the light fixture to rotate by the driving device and acquiring a corresponding first output value of the absolute encoder at each preset positioning reference point; S2. driving the light fixture to rotate by the driving device and acquiring a second output value of the absolute encoder, and when the second output value is equal to the corresponding first output value at a certain preset positioning reference point, taking the preset positioning reference point as a calibrated positioning reference point; and S3. positioning the light fixture according to the calibrated positioning reference point.

A measuring amplifier (103) with background calibration and adjustment amplifies, digitizes and processes at least one measurement signal (111) from at least one measuring transducer (102) with the aid of at least one amplifier arrangement (108). This can be intermittently replaced by an additional amplifier arrangement (107), which enables interruption-free direct calibration and, if necessary, adjustment of the amplifier arrangement. In the calibration, both a zero point error and an amplification error of the amplifier arrangement are reliably determined. A high accuracy is achieved without measurement interruption. Only one additional amplifier arrangement is generally required, even for a measuring amplifier with plural channels.

A method for automatic calibration of a camshaft sensor for a motor vehicle, allowing reduction of the fluctuations on the output signal of the sensor. The method proposes comparing, on each target rotation, the new maximum values of the magnetic field of each tooth to the maximum values of the same teeth from the preceding target rotation. The switching thresholds are only calculated with the new maximum values if these differ from the maximum values of the preceding target rotation. Moreover, the invention proposes using a single minimum value of the magnetic field, i.e. the absolute minimum value on a target rotation in order to calculate the switching thresholds.

A system including a non-circular coupler, a sensor, a memory module, and a processor module is provided. The sensor includes a transmitter coil adapted to be energized by a high frequency current source and at least two receiving coils. One of the receiver coils generate a sine-like function output signal and the other generates a cosine-like function output signal upon rotation of the coupler. The memory module is operable to compensate for non-sinusoidal output signals caused by a plurality of geometric errors and a gap between the coupler and the at least two receiving coils. The processor module configured to process the non-sinusoidal output signals from both the first and second receiver coils, determine an error in the non-sinusoidal output signals from both the first and second receiver coils, mathematically compensate the assembly to eliminate the error and generates an output signal representative of the rotational position of the coupler.

A method for measuring a property of a measuring coil, which is modeled as a parallel circuit including a capacitance with a series circuit including a DC voltage resistance, a frequency-dependent resistance, and an inductance, and a current-voltage converter is connected in series, by performing: applying an AC voltage, having a first frequency and having a DC voltage component differing from zero, to the coil and a voltage at the current-voltage converter is captured at a second frequency which is a multiple of the first frequency, wherein the multiple is an n-tuple, and the impedance and the phase angle at the first frequency are derived from at least n measured values captured in succession; and applying an AC voltage, having a third frequency differing from the first frequency and having a DC voltage component differing from zero, to the coil and the voltage at the current-voltage converter is captured at the second frequency or at a fourth frequency which is a multiple of the fourth frequency, wherein the multiple is an m-tuple, and the impedance and the phase angle at the third frequency are derived from m measured values captured in succession; at least one of the values for the DC voltage resistance, the frequency-dependent resistance, and the inductance being derived from the impedances and the phase angles.

System comprising a sensor assembly (3, 4, 5, 6) adapted to measure a magnetic field, and a moveable element (1) adapted to be moved relative to the sensor assembly between two positions by a combined axial and rotational movement, the rotational movement having a pre-determined relationship to the axial movement. A magnet (3) is mounted to the moveable element and configured to generate a spatial magnetic field which relative to the sensor assembly varies corresponding to both the axial and rotational movement of the magnet and thus the moveable element. A processor is configured to determine on the basis of measured values for the magnetic field an axial position of the moveable element.