32results about How to "Improved Temperature Compensation Accuracy" patented technology

The invention is suitable for the electronic technology field, which provides a power amplifier temperature compensation method and a device system, wherein the method includes obtaining the current working temperature of the temperature compensated power tube, automatically adjusting the optimum grid voltage of the power tube under the current working temperature; computing the warming and invigouating data in a certain range according to the current working temperature and the optimum grid voltage; real-time detecting the working temperature of the power tube, looking for the corresponding offset data in the warming and invigouating data according to the working temperature, and performing the temperature compensation to the power tube by the offset data. The invention automatically matches the corresponding warming and invigouating data for the power tubes required for temperature compensation, and obtains the temperature information of the power tube through the digital temperature sensor, and adopts the separate reference voltage module to provide the reference voltage for the D/A modular converter, which advances the temperature compensation precision of the LDMOS power tube and enhances the interference immunity.

Embodiments of the present invention provide a temperature compensation method and apparatus for a received signal strength indicator. The apparatus comprises a temperature sensor configured to measure a current temperature; and a digital compensation module configured to select a temperature compensation coefficient from prestored temperature compensation coefficients corresponding to a normal temperature, a low temperature and a high temperature according to the current temperature, and perform temperature compensation on output signals of the RSSI according to the selected temperature compensation coefficient. With the method and apparatus of the embodiments of the present invention, the accurate power values of the input signals of the RSSI under any temperatures can be obtained by measuring the characteristics of the RSSI under the predefined three temperatures, and using an interpolation method to compensate for the temperature characteristics of the RSSI. In comparison with the relevant art, the size of the storage is decreased and the accuracy of temperature compensation is improved.

The invention relates to a high-accuracy temperature compensation crystal oscillator system and an operational method of the high-accuracy temperature compensation crystal oscillator system. The high-accuracy temperature compensation crystal oscillator system comprises a computer, a power supply, an incubator, a frequency meter, a frequency-scaling and data-transporting and displaying unit, a data input and output (DIO) card used for driving the testing controlling board arranged on the computer mainboard in an inserting mode, and a general purpose interface bus (GPIB) card used for driving the incubator, the frequency meter, and the power supply. Software based on event-driving controls the power supply, the incubator and the frequency meter through the DIO card and the GPIB card, reads multiple sets of data of each set temperature point and stores the data inside a computer database. The multiple sets of data are synthesized into a plurality of five-order functions in a set temperature range, and a best curve is calculated by the software. Each coefficient of the best curve is extracted, and is converted into numbers inside the an internal memory of a crystal oscillator chip through an analog to digital (A/D) converter, and therefore the number of capacitors controlled by the memory is changed, and the purpose of high-accuracy temperature compensation of the crystal oscillator is achieved. The high-accuracy temperature compensation crystal oscillator system and the operational method of the high-accuracy temperature compensation crystal oscillator system can be produced in scale and are high in working efficiency.

A temperature-compensated crystal oscillator includes a crystal resonator; and an oscillator circuit for performing temperature compensation. The oscillator circuit has a temperature sensor unit that measures an ambient temperature of the crystal resonator, a temperature compensation unit that outputs a first voltage for temperature compensation based on the measured temperature, a high-temperature load capacitance adjustment unit that outputs a second voltage for temperature compensation based on the temperature measured in a high temperature area exceeding a particular temperature range, an oscillator unit having first and second variable capacitance elements used for temperature compensation within a particular temperature range, third and fourth variable capacitance elements used for temperature compensation in the high temperature area, and an oscillation integrated circuit (IC) connected to the crystal resonator to perform an oscillation operation, and a buffer that amplifies the output from the oscillator unit.

The invention discloses a temperature compensation system of a crystal oscillator. A Fourier function base is used for fitting. An experiment shows that the Fourier function base contains more abundant high-order information, so that under the condition that the Fourier function base is used for fitting a compensation curve, with the same number of parameters, more abundant high-order information can be contained, and higher temperature compensation precision can be obtained. In addition, according to the temperature compensation system of the crystal oscillator, real-time communication between an upper computer (PC) and an ARM control unit is achieved, the influence of an actual working state effect of a temperature compensation oscillator circuit and an effect that the precision internal reference voltage of the temperature compensation oscillator is insufficient to the control voltage obtained by the temperature compensation system is already taken into consideration.

The invention relates to the technical field of fiber-optic gyroscopes, in particular to the technical field of high-precision inertial navigation under harsh environmental conditions such as vibration and temperature. The invention discloses a high-precision fiber-optic gyroscope system based on optical fiber temperature measurement, which comprises a fiber-optic gyroscope and a fiber-optic temperature sensor, wherein the fiber-optic gyroscope comprises a first optical fiber loop; and the fiber-optic temperature sensor comprises a second optical fiber loop composed of a first polarization-maintaining optical fiber delay ring, a polarization-maintaining optical fiber temperature sensing head and a second polarization-maintaining optical fiber delay ring, wherein the polarization-maintaining optical fiber temperature sensing head is in close contact with the first optical fiber loop, and the temperature of the optical fiber loop can be accurately measured in real time. According to theinvention, not only the temperature measurement precision is improved, but also the temperature compensation accuracy of the fiber-optic gyroscope is improved, and finally, the precision and the full-temperature performance of the high-precision fiber-optic gyroscope are improved.

The invention provides a zero offset temperature compensation method and device for a fiber-optic gyroscope based on a neural network, and a storage medium. The method comprises the following steps: preprocessing a collected training sample to obtain a preprocessed training sample, and training the neural network to obtain a zero offset temperature compensation model; optimizing the zero offset temperature compensation model based on target FPGA performance in the fiber-optic gyroscope to obtain an optimized zero offset temperature compensation model; the optimized zero offset temperature compensation model is deployed on the basis of resources of the target FPGA; and when the fiber-optic gyroscope is initialized, collecting the current temperature and a plurality of historical temperatures of the fiber-optic gyroscope, preprocessing the current temperature and the plurality of historical temperatures, inputting the current temperature and the plurality of historical temperatures into the optimized zero offset temperature compensation model on the target FPGA, and outputting a compensation temperature value to compensate the zero offset temperature of the fiber-optic gyroscope. According to the method, the current temperature and a plurality of historical temperatures of the fiber-optic gyroscope and the specially designed loss function are used, so that the temperature compensation precision of the fiber-optic gyroscope is improved.

The invention relates to the field of microelectronic packaging, in particular to an array type pressure measuring device based on a packaging substrate, which comprises: an alloy shell and a piezoresistive sensitive chip which is arranged in the alloy shell and is used for applying reference pressure on the front surface of the piezoresistive sensitive chip and applying external gas pressure on the back surface of the piezoresistive sensitive chip to generate pressure difference; a packaging substrate which is provided with an air guide hole, is integrated with the piezoresistive sensitive chip, and is used for providing air pressure and acting on the two surfaces of the piezoresistive sensitive chip so as to generate the pressure difference; a circuit board, wherein the circuit board and the packaging substrate are stacked and arranged in parallel, the circuit board and the packaging substrate are stacked with a fixing structure through electric interconnection, and the circuit board is used for converting the generated pressure difference into an electric signal which is in direct proportion to pressure change, outputting the electric signal and processing and calculating the electric signal; and an alloy substrate which is used for sealing the piezoresistive sensitive chip, the substrate and the circuit board in the alloy shell. According to the invention, the assembly stress can be reduced, and the internal integrated gas path system facilitates the miniaturization of the whole pressure measurement device assembly.

The invention discloses a dual-capacitance type micro-machine accelerator sensor and a temperature self-compensating system based on the dual-capacitance type micro-machine accelerator sensor; the dual-capacitance type micro-machine accelerator sensor comprises two grids and two fixing aluminum electrodes which are respectively corresponding to two output ends; the two output ends are respectively connected with input ends of two differential capacitance voltage switching circuits, and output ends of the differential capacitance voltage switching circuits are respectively connected with an output end of a high-frequency carrier wave generator and an input end of a coherent demodulator; the output end of the coherent demodulator is connected with the input end of a low pass filter, and the output end of the low pass filter is connected with the input end of the temperature self-compensating system. The system can measure temperature of the acceleration sensor instead of an additional temperature sensor, expel the influence of the temperature measurement bias caused by temperature gradient on the compensation precision, improve the temperature compensation precision while eliminate the influence of the non-linear characteristics of the temperature coefficient on the temperature compensation result.

The invention discloses a calibration simplification method of a pressure sensor. The method comprises the following steps: 1) placing a pressure sensor in a corresponding temperature environment, applying different pressures to obtain experimental calibration data, and sending the experimental calibration data to an upper computer; 2) performing normalization processing and feature expansion on the calibration data; 3) using a hybrid polynomial kernel extreme learning machine optimized by an improved eagle optimizer to learn calibration data to obtain a calibration calculation model; 4) inputting the values of the uncalibrated temperature points and pressure points into the trained calibration calculation model to obtain model calculation data; and 5) integrating experimental calibration data and model calculation data to form an online compensation data table, sending the online compensation data table to the MCU, and performing online temperature compensation on the pressure sensor by using a linear interpolation method. Through a small amount of calibration data, calculation data of the whole temperature zone can be inferred, temperature and pressure points needing to be calibrated are reduced, calibration work efficiency is improved, energy consumption is reduced, and temperature compensation precision is improved.