26 results about "Ground noise" patented technology

The invention discloses a non-linear compensation circuit for a signal acquisition probe, which comprises a sampling resistor, and is characterized in that the sampling resistor and an equipotential input end arranged at one end of the sampling resistor are utilized, a secondary amplification method is utilized, and a sampling resistor R2 network is matched with differential input during primary amplification, so that a signal / noise path is separated; a dynamic ground potential compensation system is constructed before amplification input, noise is dynamically monitored and shielded, post-filtering is conducted on the noise, and meanwhile phase compensation is achieved through a filtering network; and finally, noise cancellation and main signal amplification are completed by using a next-stage amplifier. The circuit overcomes grounding noise interference caused by multiple distributed grounding points in the prior art, and meanwhile, due to the fact that dynamic potential compensation is added, high-sensitivity detection and noise compensation are achieved. The invention further provides a method based on the nonlinear compensation circuit.

The invention relates to the technical field of satellite positioning, and discloses a positioning detection method and system, electronic equipment, a storage medium and a program product. The method comprises the following steps: acquiring carrier-to-noise ratio data corresponding to each satellite in a plurality of satellites on which a positioning system performs positioning; acquiring ground noise signal data of the positioning system under the condition that the positioning effect of the positioning system is determined to meet a preset condition based on the carrier-to-noise ratio data; performing data processing on the ground noise signal data to obtain fluctuation characteristic data of the ground noise signal data; and obtaining a positioning detection result of the positioning system based on the fluctuation characteristic data. Through the method, the accuracy and effect of positioning interference detection can be improved.

The utility model discloses a sensor application system and a fluid system, and relates to the technical field of heating and ventilation, a grounding path of a sensor module and a grounding path of a master control module form an independent ground division framework through a shielding shell, and the shielding shell of a sensor shell provides an electromagnetic shielding layer to suppress interference of an external electromagnetic field on a telecommunication module; the ground potential difference of the sensor side and the main control side is borne by the fluid pipeline in a grounded mode, high-voltage surge of a fluid system is prevented from being conducted to a circuit of the main control module, direct electrical connection is blocked through the isolation transmission module, and common-ground noise interference is eliminated. Therefore, anti-interference and safety collaborative optimization is realized at low cost.

The invention discloses a radio frequency amplifier testing assembly, and relates to the technical field of radio frequency amplifier testing, and the radio frequency amplifier testing assembly comprises an automatic feeding and conveying assembly which is installed at the side end of a front end bottom noise detection assembly through a supporting framework and is used for forming constant-speed conveying operation according to the detection speed, under the cooperation of the integrated detection assembly, the dynamic balance adjustment assembly and the front-end ground noise detection assembly, the universality and the production efficiency of equipment are improved, the ground noise detection function and the radio frequency signal detection function are further integrated, the overall performance and the data accuracy of the test system are improved, synchronous detection of multiple parameters is achieved, and the test efficiency is improved. Compared with the prior art, the method has the advantages that the trouble of frequently replacing detection connection lines and adjusting instrument settings in the traditional test is avoided, the operation process is further simplified, the risk of manual operation errors is reduced, the method can automatically adapt to the change of input and output impedance and working frequency, time waste and operation complexity caused by the calibration process are reduced, and the test efficiency is improved.

The invention relates to a ground noise determination method, a screen control method and a corresponding device, and the method comprises the steps: determining the first environment noise energy of electronic equipment in the environment; acquiring first energy of a signal acquired by a proximity sensor in the electronic equipment at any moment from the starting moment to the target moment; and determining floor noise energy according to the first energy and the first environmental noise energy. According to the technical scheme, the environment noise energy and the first energy collected by the proximity sensor can be obtained before the receiving end receives the energy of the first target signal, and the ground noise energy is determined according to the first energy and the environment noise energy. And on the other hand, the ground noise energy can be determined at any moment from the starting moment to the target moment of the proximity sensor, so that the ground noise can be measured again when the proximity sensor is started each time, and the problem that the measured ground noise is inaccurate due to the structural change of the electronic equipment is avoided.

The invention provides a background noise adjustment method and system, a skin processing device and a storage medium, and the method comprises the steps: obtaining an instant background noise parameter of a distance sensor through responding to a power-on operation of the skin processing device; judging whether the instant ground noise parameter is in a preset ground noise fluctuation range or not; if the instant ground noise parameter is within the preset ground noise fluctuation range, updating a dynamic ground noise parameter and a basic ground noise parameter of the distance sensor according to the instant ground noise parameter to obtain a new dynamic ground noise parameter and a new basic ground noise parameter; and controlling the distance sensor to perform distance detection based on the new dynamic floor noise parameter, and updating the preset floor noise fluctuation range based on the new basic floor noise parameter. Dynamic adjustment of the bottom noise of the sensor can be achieved, and then accurate control over the skin treatment device is achieved.

The invention discloses a shielding case for a wind measurement millimeter wave radar, and relates to the technical field of shielding cases. The problem that an existing shielding case cannot effectively restrain the influence of electromagnetic interference such as ground noise on radar signals, and consequently the radar signal-to-noise ratio is low is solved. The device specifically comprises a supporting plate, vertical rods are fixed to the four corners of the outer wall of the top of the supporting plate through screws correspondingly, a top plate is fixed to the outer walls of the tops of the vertical rods through screws, a fixing frame is arranged on the outer wall of one side of each vertical rod, and a plurality of fixing openings are formed in the outer wall of each fixing frame and fixed to the outer wall of one side of the corresponding vertical rod through screws; and a horn-shaped divergent structure is fixed on the outer wall of the fixed frame. According to the invention, the unique trumpet-shaped diverging structure is arranged at the opening of the shielding cover, so that perfect impedance matching of radar waves from waveguide to free space is realized, energy reflection and standing waves at the outlet are reduced, side lobe and back lobe radiation energy pointing to the ground is remarkably reduced, system ground noise is effectively reduced, and the signal-to-noise ratio of millimeter wave radar is improved.

The invention belongs to the technical field of acoustic emission signal analysis, and particularly relates to a continuous impact acoustic emission signal floor noise feature calculation method. The acoustic emission waveform signal mainly has two forms, namely an impact signal and bottom noise, and the proportion of the bottom noise is larger, so that the distribution of all characteristic values obtained by calculating the characteristic values of the acoustic emission signal in a window with a certain width and drawing a sliding window is obtained, and the position where a first peak value appears in the distribution is the effective value of the bottom noise. The ground noise signal is also a high-frequency signal, and the sampling rate of the acoustic emission signal reaches 1M or even higher when the rotary machine fault diagnosis is carried out by using an acoustic emission monitoring means, so that the ground noise signal also contains abundant information, and the characteristic value of the ground noise comprises the characteristics of an effective value, a kurtosis value and the like. And calculating the continuous acoustic emission signal characteristics. The ground noise signal features are used for evaluating the indexes of the early abnormal state of the rotating machine.

The invention discloses a wireless earphone and a ground noise test method of the wireless earphone, and belongs to the technical field of electronic equipment. The wireless earphone comprises a wireless communication unit, the wireless communication unit comprises a coding and decoding module, and the coding and decoding module comprises an audio output interface and a pickup input interface; the sound production unit is electrically connected with the pickup input interface and the audio output interface; the control unit is in communication connection with the wireless communication unit, and the control unit is used for controlling the wireless communication unit to transmit a communication signal at the maximum transmitting power; controlling the coding and decoding module to close the signal output of the audio output interface, and collecting the electric signal of the pickup input interface; and determining a background noise test result of the wireless earphone based on the electric signal.

The invention discloses a wide-band spectrum sensing method and device based on threshold improvement, equipment and a medium. The method comprises the following steps: dividing a preset frequency band into a plurality of continuous and equal-broadband sub-frequency bands; for each sub-frequency band, calculating a bottom noise sequence of the sub-frequency band according to the receiving tying band IQ signal in the sub-frequency band and the number of frequency points in the sub-frequency band; performing J-layer wavelet decomposition on the bottom noise sequence to obtain an approximation coefficient and a detail coefficient; reconstructing the ground noise sequence to obtain a smoothed ground noise sequence; according to a preset system total target false alarm probability, a system frequency slot number, a spectral line number of each frequency slot and a variance of the smoothed bottom noise sequence, calculating an energy threshold value of each frequency point of the sub-frequency band; and taking the thresholds corresponding to the plurality of sub-bands as judgment thresholds of an energy sensing algorithm, and processing the signal by using the energy sensing algorithm to obtain a sensing result. According to the embodiment of the invention, the false alarm rate in wide-band spectrum sensing can be reduced, and the sensing accuracy is improved.

The utility model relates to a prefabricated cabin structure with sound insulation and noise reduction functions, the prefabricated cabin comprises a bottom plate, side plates and a top plate, the bottom plate is designed to be of a multi-layer structure and comprises an anti-skid layer, a first supporting layer, a first sound insulation layer, a second supporting layer and a second sound insulation layer, the anti-skid layer is composed of an inclined plate and a flat plate, and the inclined plate and the horizontal plane form an angle of 10-15 degrees; the drainage and anti-skid effects can be obviously improved; the first supporting layer is composed of a supporting plate and supporting legs, the contact area between the supporting legs and the ground is small, and vibration transmission is reduced; the second supporting layer is made of a vibration absorption material, and ground noise and vibration are further isolated; the second sound insulation layer is arranged on the second supporting layer, plays a sound insulation role and bears the first sound insulation layer, the first sound insulation layer can be made of a flexible sound insulation material, the noise reduction effect is further enhanced, and due to the structural design, the stability and the sound insulation effect of the cabin body are improved, noise pollution is reduced, and the cabin body is easier and more convenient to install.

The invention relates to an audio processing method and device, electronic equipment and a storage medium, and the method comprises the steps: converting a collected audio signal of target audio equipment into a frequency domain, and obtaining the first frequency domain information of the audio signal; wherein the first frequency domain information comprises amplitude values of different frequency components of the audio signal; determining a reference value according to the amplitude value; determining bottom noise information of the audio signal according to a difference value between the amplitude values of different frequency components and the reference value; the ground noise information is used for reflecting the ground noise processing capability of the target audio equipment.

The invention discloses a low-background-noise battery pack micro internal resistance detection system, which comprises a signal acquisition module, an excitation source module and a double-channel isolation power supply, and is characterized in that the double-channel isolation power supply module provides low-noise power supplies for the signal acquisition module and the excitation source module respectively; the excitation source module is composed of a waveform generation module, a current source circuit and a driving coupling circuit and is used for injecting an alternating current signal into a battery pack and providing a reference square wave signal required by the detection module, and the signal acquisition module is composed of an input coupling circuit, a front composite amplification circuit, the detection module, a fully differential circuit, an A / D module and an MCU module. According to the technical scheme, the front-end circuit design in the system is simplified, the system performance is optimized, the defect that equivalent input noise is increased due to the fact that the measuring range is increased in a traditional scheme is overcome, and the overall performance and the measuring precision of the system are improved.

A computer-implemented system and related method manage noise from a drone. This method comprises generating a flight path for the drone from an origin to a destination and determining a path segment ground noise level for each segment that makes up the flight path within each ground level noise zone (GLNZ). A minimum altitude is determined for each path segment that is based on the determined path segment ground noise level within each GLNZ. The drone height / altitude above ground is controlled to be at or above the determined minimum altitude as it traverses the path segments of the path within each GLNZ.

The present invention discloses a high-frequency signal processing circuit and method for a position sensitive detector, which belongs to the technical field of weak signal conversion and detection; a weak high-frequency optical signal is converted into a weak high-frequency current signal through a PSD working circuit, the current signal is converted into a voltage signal through a transimpedance amplifier circuit, the voltage signal is amplified again through the secondary amplifier circuit, and finally the position change of the optical signal on the x-axis and y-axis of the PSD is obtained through the addition and subtraction circuit. The present invention has the advantages of simple circuit structure and little interference of the output result by the amplification accuracy of the operational amplifier and ground noise. Through experimental testing, the output signal stability of the present invention is good, and the circuit processing result also has high accuracy.

The invention provides an interference control method and device, a computer readable storage medium and electronic equipment, and relates to the technical field of power control. The interference control method comprises the following steps: determining an uplink frequency band of a railway communication system; acquiring a ground noise level raising value of an uplink frequency band caused by a signal transmitted by the mobile communication base station; determining a target lifting value interval in the plurality of lifting value intervals based on the ground noise level lifting value; determining a target power control strategy in a plurality of power control strategies based on the target raising value interval; wherein the power control strategies are in one-to-one correspondence with the lifting value intervals; and controlling the power of the mobile communication base station based on the target power control strategy. According to the invention, the compatibility of the mobile communication base station and the railway communication system can be improved.

This application relates to the field of vehicles, and addresses the problem of improving the detection accuracy and reliability of charging connection confirmation signals in integrated designs of on-board chargers and DC / DC converters. This application provides a detection device, method, and electronic device. The detection device includes a first resistor, a sixth resistor, a fourth capacitor, and an amplifier, wherein: one end of the sixth resistor is connected to ground; the other end of the sixth resistor is connected to one end of the fourth capacitor, one end of the first resistor, and the negative input terminal of the amplifier; the other end of the first resistor is connected to the other end of the fourth capacitor and the output terminal of the amplifier. According to the embodiment of this application, the device separates the power ground and signal ground of the DC / DC converter through hardware, uses a differential amplifier circuit for detection, suppresses the influence of common ground noise on the detection of the charging connection confirmation signal, and improves the anti-interference capability and reliability of the charging connection confirmation signal connection status identification.

The invention relates to a secondary satellite load design method applied to ultra-low negative signal-to-noise ratio asymmetric time-frequency difference positioning. The method comprises the following steps of: calculating analog ground noise total power PNAD of an input AD and a maximum gain value Gmax of a secondary satellite receiving load channel; calculating the signal-to-noise ratio SNRr of the auxiliary satellite receiving signal, and obtaining the power spectrum density Ssignal of the auxiliary satellite receiving signal at the AD inlet end; selecting an AD device according to the instantaneous working bandwidth and the AD quantization bits, calculating the quantization noise power spectrum density SSNR of the selected AD device, and further obtaining the quantization signal-to-noise ratio SNRd of the received signal after AD quantization; calculating a gain minimum value Gmin based on a set AD quantization signal-to-noise ratio threshold value and the SNRd; if Gmax is greater than or equal to Gmin, taking the selected AD device as an AD device of a secondary satellite receiving load channel link, and selecting an arbitrary value between Gmin and Gmax as a channel gain design value; otherwise, the AD device with the signal-to-noise ratio higher than the current signal-to-noise ratio is selected again until the condition that Gmax is larger than or equal to Gmin is met, and the selected AD device is obtained; the selected AD device, the channel gain design value, the receiving channel noise coefficient and the instantaneous working bandwidth are designed for a secondary satellite load top layer.

The invention discloses a CZT-based target motion state estimation system and method, and the method comprises the steps: generating a time-frequency graph according to an IQ signal, carrying out the ground noise estimation and image segmentation processing in a preset frequency band, and detecting a target signal; doppler frequency estimation based on CZT is carried out on the target signal; then, performing interpolation processing on the Doppler frequency, and eliminating singular value points; and finally, the Doppler frequency curve of the target signal in unit time is classified, so that the motion state of the target is judged, the Doppler frequency estimation algorithm based on the CZT is higher in precision, does not need to depend on a large number of annotation samples, is lower in cost, is high in judgment condition interpretability, and is higher in motion state judgment accuracy under the condition that only IQ signals are obtained.

The invention relates to the technical field of communication, in particular to a threshold adjustment method and device, equipment and a computer readable storage medium. The threshold adjustment method is executed by the terminal, the terminal is provided with a photoelectric proximity sensor, and the method comprises the following steps: determining a first temperature of a light-emitting element in the sensor; determining first ground noise corresponding to the first temperature according to a first mapping relation between the temperature of the light-emitting element and the ground noise; and determining an induction threshold value of the sensor corresponding to the first temperature according to a second mapping relation between the ground noise and the induction threshold value of the sensor. The sensing threshold value is adjusted by determining the temperature of the light-emitting element and determining the corresponding ground noise according to the mapping relation, so that the situation that the ground noise is changed due to the temperature, the intensity of received light is changed along with the ground noise at the same distance, the sensing threshold value is not changed, and the sensor fails is avoided; and corresponding control cannot be realized at the preset position.

The invention is suitable for the technical field of digital audio adjustment, provides a processing method for suppressing audio background noise and a related device, and aims to suppress a background noise signal value in an audio input signal before gain processing, reduce interference caused by gain amplification of the background noise signal value and improve user experience. The method is applied to a sound system and mainly comprises the steps that an audio input signal is acquired, and the audio input signal is a signal which is not subjected to gain processing; suppression processing is carried out on the audio input signal according to a preset ground noise signal value, a first audio output signal is obtained, and the target ground noise signal value is a preset signal value needing suppression; performing gain processing on the first audio output signal according to a preset volume table to obtain a second audio output signal, the volume table recording digital power amplifier gains corresponding to different volume step numbers; and playing according to the second audio output signal.

The present invention provides an obstacle recognition method, apparatus and electronic device; wherein, the method includes: obtaining initial point cloud data of the vehicle surrounding environment, and filtering out ground noise points and edge noise points to obtain target point cloud data; and clustering the target point cloud data based on the run clustering algorithm to obtain initial obstacle information; and filtering the initial obstacle information according to a preset filtering rule to obtain obstacle information; the method first filters out ground noise points and edge noise points in the initial point cloud data, and clusters to obtain initial obstacle information; then filters the initial obstacle information again according to the preset filtering rule, so as to effectively alleviate the problem that the edge noise points and ground noise points affect the accuracy of the under-segmentation of the obstacle clustering result, improve the accuracy of obstacle recognition, and further improve the safety of vehicle autonomous driving, and has good practical value.

The present invention discloses a non-linear compensation circuit for a signal acquisition probe. The circuit includes a sampling resistor. By using the sampling resistor and an equipotential input terminal arranged at one end of the sampling resistor, and by using a two-stage amplification method, during the first-stage amplification, a sampling resistor R2 network is used in cooperation with differential input to separate the signal / noise paths. And a dynamic potential compensation system is constructed before the amplified input to dynamically monitor and shield noise, filter the noise after the noise method, and at the same time use a filter network to realize phase compensation. Finally, the latter-stage amplifier is used to complete noise cancellation and main signal amplification. The circuit of the present invention overcomes the grounding noise interference caused by distributed multiple grounding points in the prior art. At the same time, due to the addition of dynamic potential compensation, high-sensitivity detection and noise compensation are realized. The present invention also provides a method based on the above non-linear compensation circuit.

The invention relates to the field of communication signal processing, in particular to a repeater floor noise suppression method and system, and the method comprises the following steps: obtaining an intermediate frequency signal of an uplink of a repeater; performing power accumulation on the plurality of intermediate frequency signals to obtain a power accumulation value; judging whether the power accumulated value is greater than a first bottom noise threshold; if the power accumulated value is greater than the first bottom noise threshold, opening a repeater uplink; if the power accumulation value is smaller than or equal to the first bottom noise threshold, whether the power accumulation value is larger than a second bottom noise threshold is further judged; if the power accumulated value is greater than a second bottom noise threshold, performing spectral analysis on the signal; judging whether the signal is a useful signal; if the signal is a useful signal, opening an uplink of the repeater; if the signal is a useless signal, closing an uplink of the repeater; and if the power accumulated value is less than or equal to the second bottom noise threshold, closing the uplink of the repeater. The present application has an effect of reducing the occurrence of a situation in which the uplink of the repeater is closed due to misjudgment of the repeater.

The invention discloses a signal control system ground noise interference isolation device which comprises a high-frequency filtering unit, a high-voltage equipotential connector and a ground voltage monitoring device, the high-frequency filtering unit is electrically connected with a protection ground, the high-voltage equipotential connector and a ground screen of a lightning protection ground, the high-voltage equipotential connector is further electrically connected with a working ground, and the ground voltage monitoring device is electrically connected with the high-frequency filtering unit. And the ground voltage monitoring device is electrically connected with the ground grid. Through isolation of ground noise interference of a control system and suppression of lightning stroke or other overvoltage types, equipotential connection of a protection ground, a working ground and a lightning protection ground in a power frequency and direct current system and physical isolation in a high-frequency energy section are achieved, the influence of ground potential return stroke and ground noise on the control system is reduced, and the reliability of the system is improved. The safety and continuity of equipment operation are ensured, and the production efficiency is improved.

The invention discloses a millimeter wave radar dynamic ground noise qualification detection method and device and a medium, and the method comprises the steps: sequentially obtaining time domain signals of a plurality of linear frequency modulation pulses corresponding to each frame in a plurality of continuous frames of a radar in a darkroom test environment, and obtaining a time domain signal set; performing de-mean processing on the time domain signal set to obtain a new time domain signal set; and obtaining the maximum absolute value after obtaining the absolute value of the new time domain signal set, and if the maximum absolute values of a plurality of continuous frames are within a preset threshold value, determining that the dynamic ground noise of the radar is qualified. According to the millimeter wave radar dynamic ground noise eligibility detection method and device and the medium, external interference is eliminated depending on the controllable environment of a darkroom and angle reflection, a traditional frequency domain processing mode is replaced with simple operation of directly removing mean value through a time domain and taking the maximum absolute value, and the problems that a traditional scheme is large in calculated amount and high in reliability can be solved. And the qualification of the radar dynamic ground noise is difficult to quickly judge.