12results about How to "Increase the output frequency" patented technology

The invention discloses a combined orientation and attitude measurement system and method based on navigation array antennas and MEMS inertial navigation, the system comprises satellite navigation array antennas, MEMS inertial navigation, an MEMS inertial navigation attitude resolving module and a combined attitude measurement filter module, one MEMS inertial navigation is integrated in each satellite navigation array antenna, the satellite navigation array antennas are connected with the combined attitude measurement filter module, and the MEMS inertial navigation attitude resolving module is connected with the combined attitude measurement filter module. And the MEMS inertial navigation is connected with the combined attitude measurement filter module through the MEMS inertial navigation attitude resolving module. The MEMS inertial navigation is integrated in the satellite navigation array antenna, on one hand, compared with a traditional combination mode of using optical fiber inertial navigation or laser inertial navigation and a satellite navigation orientation / attitude measurement system, the system size is effectively reduced, the system integration degree is improved, and the system cost is reduced; and on the other hand, the orientation and attitude measurement data of the satellite navigation system and the attitude measurement data of the MEMS inertial navigation system are fused, so that the orientation and attitude measurement precision of the satellite navigation system can be effectively improved, the output frequency of the orientation and attitude data can be improved, and meanwhile, the continuous working capability of the orientation and attitude measurement system can be maintained within a certain time when the satellite navigation signal is unlocked.

The invention discloses a TDLAS (Tunable Diode Laser Absorption Spectroscopy) light source system based on a cross frequency shift technology, relates to the technical field of laser frequency shift, and solves the problems that when an output wavelength is tuned by changing an injection current, the output wavelength is difficult to stably adjust to an expected target, so that the current is repeatedly changed to cause frequency shift, and the frequency shift is influenced. And the technical problem of bandwidth waste caused by single use of a large-range bandwidth for tuning is neglected. The laser V1 is processed to obtain laser frequency information, and the frequency of the laser V2 is adjusted to be close to the reference frequency; obtaining an error signal based on the laser frequency information and the laser V2; adjusting the output frequency of the laser 2 to a first frequency locking point through a feedback value obtained by processing the error signal, and synchronizing the output frequency of the laser 1 to a second frequency locking point; the repetitive system circularly and crossly updates the output frequencies of the lasers 1 and 2; according to the invention, unstable output frequency caused by uncertainty of output wavelength due to repeated change of current can be avoided.

The invention discloses a course angle real-time fusion method and system, and the method comprises the steps: collecting the output data of an MEMS inertial navigation system and a double-antenna satellite receiver in real time, updating a course angle storage sequence and a Z-axis angular velocity storage sequence in real time, carrying out the comprehensive information processing and data fusion, correcting the course angle of the MEMS inertial navigation system, and outputting the corrected course angle. And updating the numerical value in the course angle storage sequence. In the scheme provided by the invention, the MEMS inertial navigation system provides accurate relative angle variation in a short time, so that the fused course angle has relatively high output frequency; the course angle information of the double-antenna satellite receiver is utilized, so that the fused course angle has relatively high precision in a long time; the inertial navigation direction angle, the double-antenna course angle, the velocity decomposition course angle and the angular velocity information of the carrier are comprehensively utilized, so that the fused course angle has higher reliability and stability.

The invention provides an implementation method of a cesium atom magnetometer system based on double-closed-loop feedback control. The implementation method can be applied to the technical field of atom magnetic sensors and the technical field of optical pump magnetometers. The method comprises the following steps: controlling voltages at two ends of a first resistance voltage-dividing network by using a first thermistor based on an ambient temperature; controlling the output frequency of the voltage-controlled oscillator by using the first resistance voltage-dividing network based on the voltage at the two ends of the first resistance voltage-dividing network; a second thermistor is used for controlling voltages at two ends of the second resistance voltage-dividing network based on the environment temperature; controlling the output power of the radio frequency power amplifier by using a second resistance voltage-dividing network based on the voltage at the two ends of the second resistance voltage-dividing network; a voltage-controlled oscillator is utilized to output a signal with a preset frequency to a radio frequency power amplifier, the radio frequency power amplifier is utilized to inject output energy with the preset frequency and power into a cesium bulb of the cesium atom lamp so as to lighten the cesium bulb, and stable output of the radio frequency power amplifier is achieved through temperature compensation of the frequency and the power output by the radio frequency power amplifier.

The invention discloses an oil pumping unit capable of automatically adjusting stroke frequency, which relates to the technical field of oil field automation control, and comprises a crank connecting rod regulation and control assembly which is arranged at the bottom of a connecting piece and is used for automatically adjusting the motion rhythm and force according to the change of the yield and pressure parameters of an oil well, and the stroke frequency is automatically adjusted under the cooperation of the crank connecting rod regulation and control assembly. The whole pumping unit adjusts the operation condition in real time according to the dynamic change of an oil well, so that the working state of the pumping unit is always matched with the liquid supply capacity of the oil well, the pumping unit can quickly adapt to the change of the liquid supply capacity of the oil well, the response speed and the adjustment precision of the pumping unit are greatly improved by 20% compared with a traditional pumping unit, the exploitation benefit of the oil field is effectively improved, and the economic benefit is increased. And under the cooperation of the driving regulation and control assembly, mechanical impact caused by inertia is prevented, it is ensured that the whole operation can be safely operated, the oil extraction efficiency and the equipment reliability are improved, the service life is prolonged, and the operation and maintenance cost is reduced.

The present application discloses a single longitudinal mode pulse laser feedback control circuit and control method, the circuit includes: an optical signal acquisition module, used to collect optical signals in the laser; a signal processing module, used to determine whether the i-th optical signal reaches the single longitudinal mode pulse laser output condition, if it reaches it, outputs the single longitudinal mode pulse laser, if not, adjusts the linear pulse voltage of the input laser, and obtains the i+1th optical signal in the laser; a linear pulse voltage control module, used to adjust the linear pulse voltage in the input laser; the optical signal acquisition module is connected to the signal processing module; the signal processing module is connected to the linear pulse voltage control module; the signal processing module and the linear pulse voltage control module are respectively connected to the laser. The circuit can make the output probability of the single longitudinal mode pulse laser reach 100%, and the control efficiency is relatively high. Another aspect of the present application also provides a single longitudinal mode pulse laser feedback control method.

The invention relates to the technical field of flue gas desulfurization and energy conservation, and discloses an oxidation fan system which is characterized in that a variable-frequency centrifugal fan unit inputs oxidation air into a slurry pond; the calcium sulfite concentration tester obtains the concentration value of calcium sulfite from the slurry pond; the dissolved oxygen meter obtains a dissolved oxygen concentration value from the slurry pond; when the concentration value of calcium sulfite is less than or equal to 0.01 mmol / L and the concentration value of dissolved oxygen is more than 0.6 mg / L, the oxidation fan system reduces the output frequency; when the concentration value of calcium sulfite is less than or equal to 0.01 mmol / L and the concentration value of dissolved oxygen is less than 0.6 mg / L, the output frequency is improved; when the concentration value of calcium sulfite is less than or equal to 0.01 mmol / L and the concentration value of dissolved oxygen is 0.6 mg / L, the output frequency is maintained. The variable-frequency centrifugal fan unit is combined with the calcium sulfite concentration value and the dissolved oxygen concentration value, the output frequency of the variable-frequency centrifugal fan unit is adjusted, air volume adjustment is achieved, and the energy-saving effect is achieved.

The utility model discloses a C-band high-power airborne power amplifier, and belongs to the field of microwave communication. The circuit comprises a radio frequency amplification circuit, a power supply circuit, a detection circuit, a state return circuit, a negative voltage protection circuit and a working / silence circuit. The radio frequency amplification circuit is used for amplifying the power of a radio frequency signal, the power supply circuit is used for supplying power to the radio frequency amplification circuit, the state return circuit and the negative voltage protection circuit, the detection circuit is used for converting a detection signal into a detection voltage, and the state return circuit is used for comparing the detection voltage with a reference voltage and outputting a state return signal; the working / silence circuit receives an external control signal and controls the working / silence state of the power supply circuit, and the negative voltage protection circuit ensures that the power supply circuit outputs negative voltage. The utility model has the advantages of high output power, small volume and weight, good heat dissipation and good electromagnetic compatibility, and can adapt to various complex natural environments.

The embodiment of the application discloses an indoor positioning method, device, mobile terminal and storage medium, the method comprises: predicting the state of the mobile terminal at the target time based on acceleration and angular velocity, obtaining first state information; height estimation is carried out based on acceleration and first height, and second height is obtained; the first state information is corrected based on the first height, the second height and the pseudo-range observation value, and the second state information is obtained; indoor positioning is carried out based on the second state information and indoor map information. In this way, the accuracy and reliability of indoor positioning by the pseudolite are improved by fusing the multi-source data collected by the sensor system. Especially, the second height (fusion of the acceleration measured by the accelerometer and the first height measured by the barometer) can compensate for the adverse effects of the large vertical geometric dilution of precision of the pseudolite layout on height positioning, improve the accuracy of height estimation, and thus improve the accuracy of floor positioning.

The invention provides a transient overvoltage suppression method and device in a power system fault recovery process, and the method comprises the steps: judging whether the terminal voltage of a flexible DC conversion unit is greater than a first threshold value or not when a power system is in a low-voltage fault ride-through state; under the condition that the terminal voltage is greater than or equal to a first threshold value, calculating a difference value between the output phases of the flexible direct current conversion unit and the synchronous power supply to obtain a target power angle difference; under the condition that the target power angle difference is greater than or equal to a second threshold value, controlling the power system to enter an overvoltage suppression state; and updating the target power angle difference under the condition that the terminal voltage of the flexible direct current conversion unit is within a preset range, and controlling the power system to exit the overvoltage suppression state under the condition that the updated target power angle difference is smaller than a third threshold value. According to the method, the problem of transient overvoltage of the flexible direct current conversion unit caused by uncontrollability of a synchronous power supply and coupling characteristics of power and voltage in a flexible direct current limiting mode in the prior art is solved.

The invention provides a broadband high-integration integrated Ku wave band microwave transmit-receive assembly, which comprises a shell, a frequency source module, a transmitter module and a receiver module, and is characterized in that the frequency source module is installed in the shell, and the frequency source module comprises a transmission intermediate frequency circuit, a first transmission local oscillator circuit and a second transmission local oscillator circuit; the transmitter module is mounted in the shell, and the transmitter module is configured to perform up-conversion on the output frequency of the transmitting intermediate frequency circuit and the output of the transmitting local oscillator circuit I and perform up-conversion on the obtained mixed frequency output and the output of the transmitting local oscillator circuit II to obtain a Ku-band transmitting signal; the receiver module is installed in the shell, and the receiver module is configured to mix a received Ku wave band receiving signal with a receiving local oscillator signal of the transmitter module to obtain an intermediate frequency signal, so that the technical problem that the size, the performance, the reliability and the like of an existing radio frequency front-end transceiving assembly cannot be considered at the same time is solved.

The application relates to the technical field of navigation, in particular to a combined positioning system for realizing GNSS / SINS combined vehicle CAN bus speed information, which is based on a MEMS-IMU and a GNSS receiving module, can obtain required inertial navigation calculation information and GNSS positioning information in real time, can obtain vehicle speed information through an OBD port of the vehicle, and finally can obtain a fusion positioning result by PC processing of the parameters. The combined navigation algorithm principle is based on a fusion positioning algorithm of an extended Kalman filter, and a non-integrity constraint algorithm and a zero-speed correction technology are introduced. The application enhances the robustness of the combined navigation system, and can better meet the demand for high precision and high stability of vehicle positioning.