11 results about "Ground noise" patented technology

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 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 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.

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 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 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.