30results about How to "Realize self-calibration function" patented technology

The invention discloses a radio frequency signal generating and radio frequency power detecting device. The invention comprises a radio frequency signal generating unit, which is used to generate the radio frequency signal with required frequency and power; a radio frequency signal power detecting unit, which is used to receive the radio frequency signal generated by the radio frequency signal generating unit or the radio frequency signal from the external, and to perform power detection; a radio frequency signal channel switching control unit, which is used to control the make-and-break of the input / output interface and the switching of the radio frequency signal generating unit and the radio frequency signal power detecting unit; a control unit, which is used to receive command through the interface unit, to control the radio frequency signal generating unit and the radio frequency signal power detecting unit; and an input / output interface, which is used for the input / output of the radio frequency signal. Through the adoption of the invention, the high accuracy power detection with low cost and high flexibility can be realized, and simultaneously the self calibration function can be realized, to acquire the output of the radio frequency signal with high accuracy.

The invention relates to an orthogonal mismatch calibration method and device of a direct frequency conversion transmitter. The orthogonal mismatch calibration device comprises a first voltage comparator, a second voltage comparator, a first switching circuit, a second switching circuit, a digital state machine, a low-pass filter, a gain fine-tuning circuit and a phase fine-tuning circuit. The output end of a passive frequency mixer is connected with the input end of the low-pass filter, and the output end of the low-pass filter is connected with a first input end of the second voltage comparator. The gain error and the phase error between same-phase/orthogonal channels of the direct frequency conversion transmitter are measured with the orthogonal mismatch calibration method and device; the optimal calibration value is obtained through successive approximation, the self-calibration capacity of orthogonal mismatch of the direct frequency conversion transmitter can be improved, and dependency, complexity and power consumption of a calibration system are lowered.

The invention relates to a capacitive micro inertial sensor with a self calibration function. An existing sensor with the self calibration function is small in calibration range. According to the capacitive micro inertial sensor with the self calibration function, one sensor mass block is a rectangular silicon slice etched with grid-shaped wells, two corresponding ends of the sensor mass block are connected with anchor points through silicon supporting beams, and rectangular silicon strips are respectively arranged the other two corresponding ends of the sensor mass block. Two driver mass blocks are arranged at two sides of the sensor mass block, an annular groove is formed in the middle of each driver mass block in an engraved mode, movable mass block driving silicon strips and driver driving silicon strips are arranged at two sides of each driver mass block, and the silicon strips connected with the sensor mass block form a mass block driving capacitor along with the corresponding mass block driving silicon strips. Comb tooth strips fixing the driving silicon strips and the movable driver driving silicon strips form a driver driving capacitor. Comb-shaped silicon strips and fixed detection silicon strips connected with the sensor mass block, a grid electrode and an interdigital aluminum electrode on the surface of a substrate form a detecting capacitor. The capacitive micro inertial sensor with the self calibration function increases the mass block driving capacitance, further reduces driving voltage, increases the mass of an oscillator, and reduces Brown noise.

An active array antenna calibration system, a method, an apparatus, and an active array antenna system are provided. The calibration system includes a calibration cable,a power splitting and combininglink and a calibration detection module. The calibration detection module comprises a calibration signal baseband processing chip and a radio frequency transceiver unit connected with the calibration signal baseband processing chip. The calibration cable is respectively connected with the transceiver links of each transceiver radio frequency single board and collects calibration signals of the transceiver links of each transceiver radio frequency single board. The power splitting and combining link is connected with the calibration cable and the calibration detection module, and the calibration signal collected by the calibration cable is sent to the calibration signal baseband processing chip, and the calibration signal baseband processing chip performs calibration processing. Or the original signal is sent to the antenna baseband processing chip of each RF single board, and the antenna baseband processing chip performs calibration processing. The invention realizes the self-calibration function of the multi-channel antenna array through the internal link of the equipment, thereby optimizing the antenna coverage range and the effect.

The invention discloses a ground resistance monitor with self-inspection and self-correction functions. The ground resistance monitor comprises a main circuit and a switching circuit connected with the main circuit, wherein the switching circuit is further connected with an external ground network and a standard resistor respectively. A high-precision standard resistor analog ground network is added into a circuit board, a circuit which originally tests the external ground network is switched to the standard resistor on a test board through a relay switching circuit, and if a deviation existsbetween a measured value and a preset standard resistance value, fine adjustment can be realized in a program and an offset is added to the measured value so as to reach a normal value; if a relatively large deviation exists between the measured value and the standard value, equipment has a relatively large problem and is required to be returned to a factory for repair. The switching circuit adopts the structure as follows: four double-pole double-throw relay switches are used. After adoption of the ground resistance monitor, a technician can remotely know the working state of the equipment and can perform remote correction when measurement data has a deviation.

The invention discloses an air humidity measurement method with low power consumption. The method comprises the following steps of: allowing a fixed resistor and a humidity-sensitive capacitor to form a resistor-capacitor (RC) circuit, allowing the RC circuit, a comparator in a microcontroller chip and a timer module to form a measuring circuit, and respectively measuring count values of a timer in two humidity states when the humidity-sensitive capacitor is charged to certain voltage and an output end of the comparator in the microcontroller chip produces input capture interruptions of the timer in a standard humidity environment; and saving humidity values and the corresponding count values in a storage of equipment, and effectively establishing the linear relation between the humidity and a count value, so that a measured practical humidity value is accurately calculated according to the measured count value in the practical use. The measurement method is simple, low in cost and power consumption and high in measurement accuracy, precision values can be adjusted according to application requirements, the self-correction can be performed, and the industrialized batch production of temperature and humidity instruments are convenient.

The invention relates to a fringe effect based capacitance type micro inertial sensor with self-calibrating. The existing sensor having the self-calibrating function is small in calibrating range. Sensor blocks are rectangular silicon wafers etched with grid-shaped wells; four corresponding ends are connected with anchor points through silicon supporting beams; the four corresponding ends are correspondingly provided with rectangular silicon strips in the same number; comb type silicon strips which are connected with the sensor mass blocks, fixed detection silicon strips, grid-shaped electrodes and grid-shaped aluminum electrodes on the surface of a substrate are formed into detection capacitance. When acceleration speed signals are loaded in the mass block sensitive directions, silicon strip groups on the sensor mass blocks cut electric field lines of substrate fringe electric fields and then the substrate fringe capacitance is changed; the size of the loaded acceleration speed is detected due to detection of the capacitance change of the micro inertial sensor. The existing sensor having the self-calibrating function has the advantages of increasing vibrator quality, reducing pull-in and brown noise, increasing detection capacitance and reducing pressed film air damping.

The invention belongs to the field of image processing and computer vision, and relates to an infrared stereo camera dynamic external parameter calculation method based on histogram equalization. Because the imaging of the infrared camera is different from the imaging of the visible light camera, the number of point pairs which are obtained by directly extracting feature points for matching and meet requirements is small. In order to solve the problem, feature points of a left infrared camera and a right infrared camera are extracted and matched, and an original calibration result is correctedaccording to the feature points. Besides, in order to solve the problem of insufficient feature points, feature point extraction is carried out on an original image, and feature point extraction is also carried out on an infrared image after gray histogram equalization. According to the invention, the change of the position relationship of the infrared binocular camera caused by factors such as temperature, humidity and vibration is solved. The method has the advantages of high speed, accurate result, simple operation and the like.

The invention discloses a self-calibration combined type water level gauge. The gauge is used for measuring the water level of a boiler drum and comprises a double-color water level gauge; the double-color water level gauge comprises a water level gauge body; the top of the water level gauge body is provided with a steam side connecting pipe, and the lower part of the water level gauge body is provided with a water side channel; the gauge further comprises a separation membrane box differential pressure transmitter and an integrator; the separation membrane box differential pressure transmitter comprises a low-pressure membrane box, a high-pressure membrane box and a differential pressure transmitter; the signal output end of the differential pressure transmitter is connected with the signal input end of the integrator; the gauge also comprises a first temperature sensor, a first pressure sensor, a second temperature sensor and a second pressure sensor, wherein the first temperature sensor and the first pressure sensor are installed on the steam side of the boiler drum, and the second temperature sensor and the second pressure sensor are installed on the water side of the boiler drum; the signal output ends of the first temperature sensor, the first pressure sensor, the second temperature sensor and the second pressure sensor are connected with the signal input end of the integrator. After the method is applied, the water level in the boiler drum can be visually known, and the real water level in the boiler drum can be relatively accurately mastered.

The invention discloses a miniature electrochemical sensor reference electrode potential measuring and calculating device which comprises a closed shell, a reference electrode, a temperature sensor, aconductivity sensor, a measuring circuit and a working electrode. The reference electrode, the temperature sensor and the conductivity sensor are arranged in the closed shell; and the reference electrode, the temperature sensor, the conductivity sensor and the working electrode are electrically connected with the measuring circuit through connecting wires. The invention belongs to the technical field of sensors, and aims to solve the problems of low stability of reference potential, potential drift, limited service life and difficulty in direct measurement of reference electrode potential during measurement of an electrochemical sensor in the prior art. The device has the technical effects that the device solves the problem that the reference electrode of the miniature electrochemical sensor is difficult to directly measure the electrode potential, and further solves the problems that the measurement precision of the sensor is reduced and the service life of the sensor is limited dueto degradation and drifting of the reference electrode.

The invention provides a gas mass flow controller. A detection and calibration module is used for receiving input to-be-controlled gas, conveying the input to-be-controlled gas to a flow adjusting module and detecting the actual flow value of the flowing to-be-controlled gas; the flow adjusting module is used for outputting the to-be-controlled gas and can detect and adjust the flow output value of the to-be-controlled gas; a control module is used for controlling the detection and calibration module and the flow regulation module to respectively detect a flow actual value and a flow output value in a detection and calibration mode, and controlling the flow regulation module to regulate the flow of the output to-be-controlled gas according to the flow actual value and the flow output value, so that the flow is consistent with the flow actual value; and in the real-time detection mode, the flow adjusting module is controlled to detect the flow output value in real time, and the flow adjusting module is controlled to adjust the flow of the output to-be-controlled gas according to the flow output value and the flow output value, so that the flow is consistent with the flow set value. The gas mass flow controller provided by the invention has a self-calibration function, so that the gas mass flow controller can be suitable for various different gas environments.