43results about How to "Little impact from outside interference" patented technology

The invention relates to a quaternion description based rapid convergence control method of a quardrotor, and belongs to the technical field of flight control. A quardrotor control system model is established, a quardrotor control system is divided into a position subsystem and an attitude subsystem, a finite-time position controller of the quardrotor is designed, a finite-time attitude controllerof the quardrotor is designed, a motor rotating speed controller of the quardrotor is obtained, and flight of the quardrotor is controlled according to the motor rotating speed controller thereof. Afinite-time control technology is used to improve the convergence speed of a closed-loop system, so that the system can be converged to an expected value more rapidly within finite time; and comparedwith a traditional PID control method, the rapid convergence control method of the quardrotor is higher in anti-interference performance and robustness, and influence of different external interference on the quardrotor in practical flight is reduced effectively.

The invention belongs to the field of integrated circuits, and relates to an anti-interference low-voltage detection circuit comprising a reference voltage circuit, a resistor voltage division circuit, a logical combination circuit, a shaping circuit, a recovery voltage setting circuit and a capacitance charge and discharge circuit. A resistor R1, a resistor R2, a resistor R3, and a resistor R4 of the resistor voltage division circuit are sequentially connected end to end. An initiating end R1 is connected to an input voltage VIN. The tail end R4 is grounded. The resistance value of R1 is equal to the resistance value of R4. An anode of a comparator in the logic combination circuit is connected with the reference voltage circuit. A voltage of a cathode is generated through voltage division by the resistor voltage division circuit. An output of an inverter 1 in the logical combination circuit is used for controlling charge and discharge of a capacitor. After the voltages generated by the two ends of the capacitor go through the shaping circuit, control signals are output, and at the same time, an output of a Schmidt shaping circuit of the shaping circuit is used for controlling the switching-on of an M1 and an M2 in order to set a recovery voltage. The anti-interference low-voltage detection circuit of the invention is advantageous in that: the anti-interference low-voltage detection circuit is strong in anti-interference capabilities, high in precision and accuracy, and easy to change.

The invention discloses a real-time clock synchronous error-correcting method for a charge-controlled intelligent electric energy meter, and relates to the technical field of electric energy metering instruments. The real-time clock synchronous error-correcting method comprises the following steps of creating an internal clock in a single chip microcomputer, and defining an array for storing an external clock; performing initial setting on the internal clock after the electric energy meter is electrified and started; generating a second signal through a timer, and adding one second onto the internal clock per second; whenever ten seconds are added onto the internal clock, sequentially performing check operation on the external clock and the internal clock, and performing corresponding synchronous error-correcting treatment on the abnormal clock. The real-time clock synchronous error-correcting method for the charge-controlled intelligent electric energy meter has the advantages that the anti-interference capability of the clock can be enhanced, the accuracy of the real-time clock in the electric energy meter is effectively guaranteed, and the effects of stability and reliability are achieved.

The invention discloses a self-heating heat responsive element and a liquid level detector assembled thereby. The self-heating heat responsive element comprises a heating resistor, a heat-conducting medium and a heat responsive element, wherein the heat-conducting medium is respectively and tightly contacted with the heating resistor and the heat responsive element. The heat responsive element can be a heat responsive resistor, a diode and a triode. The liquid level detector comprises the self-heating heat responsive element and a voltage comparator, wherein the self-heating heat responsive element is a special element for detecting liquid level and can reliably work in a wider temperature range. A liquid level detection circuit is simple, flexible and strong in disturbance resisting capability and can exactly detect the liquid level.

The invention discloses a test system of a propulsive water-jet pump based on echoic environment and a test method thereof, and the test system mainly takes a closed cycle system (for short, closed cycle system) of a comprehensive performance test bed of the propulsive water-jet pump as an infrastructure, wherein the test system comprises a vector transducer, a mechanical scanning system, an echoic tank, a data acquisition and analysis system and a propulsive water-jet pump model; the partial closed cycle system pipeline containing the propulsive water-jet pump and the mechanical scanning system are arranged in the echoic tank, the measured propulsive water-jet pump is encircled by using a measurement surface, discrete points from a vertical measurement surface sound field are sampled by combining the mechanical scanning system, and underwater radiation noise of the propulsive water-jet pump is measured by a sound intensity method. In the method, the influence of external interference noise source can be ignored in theory, in practical engineering application, the signal to noise ratio of the engineering test can be ensured to benefit for field measurement and sound power measurement of complex oscillating bodies in finite space, especially.

The invention discloses an electricity-taking method and device for detecting battery internal resistance. The method comprises the following steps of: generating at least a positive supply circuit and a negative supply circuit by a detected battery to supply power for at least one detecting circuit; and performing sampling the positive supply circuit and the negative supply circuit accurately. By using the electricity-taking method and device for detecting battery internal resistance, two or more than two detected batteries can be detected by using one detecting circuit; and the internal resistance of the detected battery can be detected on line or off line in real time and ultra-high common-mode rejection ratio can be obtained; the external influence on the detection precision is small, and the precision error can be less than 0.1 milliohm; the electricity-taking method and device for detecting battery internal resistance are applicable to various detection environments.

The invention discloses a transmission circuit of digital output signals in an infrared focal plane array reading circuit. The transmission circuit of the digital output signals in the infrared focal plane array reading circuit comprises a digital output signal collecting circuit and a current comparator circuit. The digital output signal collecting circuit comprises n digital output signal collecting units, and each digital output signal collecting unit converts collected digital signals into analog signals and outputs the analog signals. The current comparator circuit is used for converting the analog signals input by the digital output signal collecting units into the digital signals and outputting the digital signals. According to the transmission circuit of the digital output signals in the infrared focal plane array reading circuit, the digital output signal collecting units convert the collected digital signals into the analog signals and transmit the analog signals, the analog signals are current signals, relative to voltage signals, disturbing influence on the current signals from the external in the process of transmitting is small, after transmission is finished, when output is needed, the current comparator circuit converts the analog signals into the digital signals, and therefore external disturbance on the signals in the process of transmitting can be reduced.

The invention discloses a radar signal simulation generation method based on an SOC platform. The method comprises the following steps: constructing a hardware platform based on an SOC platform chip and a DAC structure; calculating control parameters such as pulse width, period and code element number; pulse waveform control parameters are calculated; sending each control parameter to a corresponding part of the FPGA through an AXI bus; a control instruction is issued through the AXI bus, and the DDS is controlled to periodically generate waveform data; the waveform data is output to the DAC and converted into analog signals to be output. According to the system, the performance of the SOC platform chip is fully exerted, control parameter calculation related to floating point operation is put in an ARM embedded system, signal generation with the high real-time requirement is put in an FPGA, communication between the ARM embedded system and the FPGA is achieved through a bus in the SOC platform chip, the overall structure is simpler and more convenient, the influence of external interference is small, and the reliability of the system is improved. And development and maintenance of technicians are facilitated.

A method for reconstructing a high-resolution image in a scattering scene comprises the following steps: S1, for different scattering scenes, measuring a point spread function (PSF) of each scattering scene by using a PSF measuring device, and extracting a line spread function (LSF) in a dimensionality reduction manner according to the measured PSF so as to characterize each scattering scene, and classification of different scattering scenes is realized; and S2, according to the classification result of the scattering scene, carrying out image reconstruction on a one-dimensional signal collected by a calculation ghost imaging system in the scattering scene by adaptively adopting an image reconstruction deep convolutional neural network so as to obtain a high-resolution image, wherein a training set of the reconstruction network comes from one-dimensional data collected in a scattering scene which is most matched with the scattering scene classification features, and self-adaptive high-resolution image reconstruction in different scattering scenes is realized. According to the method, different scattering scenes can be quickly classified, and quick and high-resolution imaging in the different scattering scenes is realized.

The invention discloses a sphygmomanometer testing device capable of simulating a blood pressure signal emitted by the human body. The device comprises an airbag device, an extrusion assembly in contact connection with the airbag device, a stepping motor connected to the extrusion assembly, a driving circuit connected to the stepping motor and an MCU controller connected to the driving circuit which are all arranged in a sphygmomanometer testing device body; the airbag device is used for generating an simulated airflow adjustable in amplitude and frequency and enabling a sphygmomanometer to detect and input demanded pulsating flow in order to simulate and generate a blood pressure pulse signal of the human body; the MCU controller is used for generating a control signal according to a specified blood pressure adjustment signal and controlling the driving circuit to drive the stepping motor to extrude the airbag device in order to generate the simulated airflow adjustable in amplitude and frequency, and thus the sphygmomanometer can detect and input the demanded pulsating flow. The provided sphygmomanometer testing device can truly and accurately simulate the blood pressure signal of the human body and accurately detect the accuracy of the sphygmomanometer.

The invention provides a serial communication system and method of a single chip microcomputer. The serial communication system of the single chip microcomputer comprises: a first single chip microcomputer, a first signal sending port, a first signal receiving port, a first signal receiving module and a first signal sending module; and a second single chip microcomputer, a second signal sending port, a second signal receiving port, a second signal receiving module and a second signal sending module, wherein the first signal sending module is connected with the second signal receiving module via a signal line; the second signal sending module is connected with the first signal receiving module via a signal line; and the signal line is connected with a DC power supply with an output voltagebeing greater than +5.5V. According to the serial communication system of the single chip microcomputer provided by the invention, the DC power supply with the output voltage being greater than +5.5Vis connected to the signal line, thereby increasing the voltage and the current on the signal line, reducing the influence of the external interference to the information transmitted on the signal line, and improving the information transmission accuracy between the single chip microcomputers.

The invention relates to the technical field of wood processing and treating, and discloses a treatment and purification method of dyeing wastewater produced by wood processing. According to the treatment and purification method of dyeing wastewater produced by wood processing, prepared mangano-manganic oxide nanoparticles grow and attach onto pore channels of a porous structure of active zeolite,so that a porous compound doped with rod-like mangano-manganic oxide is obtained; and thus, synergistic effects and interface effects can be produced so as to facilitate adsorption and degradation ofdye molecules. In the presence of light irradiation, electrons on photo-degradable materials are excited so as to produce transition, so that photo-induced electron holes are formed so as to furthercombine with oxygen to produce superoxide anions with super-strong oxidability; and thus, organic dyes, which are difficult to degrade, are degraded into carbon dioxide and water. Therefore, degradation rate of dyes by adopting the treatment and purification method can be up to 99% or above; and reuse rate of the porous compound doped with rod-like mangano-manganic oxide can be up to 10 times or above. Tests have proven that degradation rate of methylthionine chloride within 60 minutes by adopting the treatment and purification method can be up to 100%; moreover, the treatment and purificationmethod has the advantages of being energy-saving, efficient, green, safe, capable of ensuring complete degradation, free of secondary pollution and so on.

The invention relates to a shielding network wire, in particular to a six-type shielding network wire with good shielding effect and reduced external disturbance influence and a production method thereof. The six-type shielding network wire comprises 8 core wires with pitches of brown-brown and white 12.6 mm, blue-blue and white 18.5 mm, green-green and white 16.8 mm and orange-orange and white 11.6 mm, each group of core wires are wrapped by a single-surface compound aluminium foil with thickness of 0.025 mm so as to ensure the core wires are completely wrapped in the single-surface compound aluminium foil, the metal of the single-surface compound aluminium foil inwards faces, and 4 groups of wrapped core wires are twisted; a tinned copper wire is added to the 4 groups of twisted core wires to be weaved with a copper wire, the tinned copper wire is placed inside a weaving wire, and finally the weaved copper wire is used as a jacket to wrap and is directly wrapped into coils. The invention solves the problem of the factors influencing data transmission, each group of twisted wires are completely shielded, thereby the external disturbance influence to the integral network wire is reduced, and the rigidity of the network wire is less than the bending of the same; and in addition, the invention overcomes the shortages of the prior products in the market and is a creative product.

The invention relates to a counting machine, which comprises a material emptying device, a material collecting device, infrared counting devices, a counting device, and a product track, wherein the product track is arranged between the material emptying device and the material collecting device; the infrared counting devices are arranged on both sides of the product track; the counting device is connected with the infrared counting devices; and the counting device is connected with the material collecting device. Compared with the prior art, the counting machine has the advantages that the counting machine is little influenced by external disturbance, has accurate counting, and uses a high-speed high-sensitivity multifunctional counter which can set a standard value at will, and when the counting value is equal to the set value, a stopping signal is given; the material receiving device can regulate speed steplessly and set the speed at will according to requirement; and the whole machine is light and convenient, simple in operation and low in manufacturing cost.