203 results about "Reference distance" patented technology

The invention discloses an imaging method, system and device for correcting range migration based on frequency domain phase multiplication, and the method comprises the following steps: carrying out the range pulse compression of echo data of each receiving array element in a range frequency domain; performing data preprocessing according to a phase center approximation method to obtain equivalent transmit-receive combined synthetic aperture sonar data; deriving a secondary distance compression item at the reference distance in the two-dimensional frequency domain, and performing secondary distance compression processing; deriving a space-variant migration phase term of range migration correction corresponding to each target with different distances; carrying out filtering processing on the two-dimensional frequency domain sonar data; a filtered result is converted to a range-direction time domain and an azimuth-direction Doppler domain, data of targets at corresponding distances are extracted, and the data extracted each time are combined in sequence; and for the data after range migration correction, azimuth pulse compression is carried out in a range time domain and an azimuth Doppler domain, and the data is converted to a two-dimensional time domain to obtain a sonar image.

The invention provides a laser radar ranging method and system, a laser radar, an automobile and a medium, and the method comprises the steps: carrying out the peak interval interception of an obtained histogram curve, and obtaining all peak curves; corresponding pulse width coefficients, centroid moments and distance pulse width interval groups are obtained through a centroid method for interpolation peak value curves obtained through interpolation of all the peak value curves, and centroid interval interception is conducted on all the interpolation peak value curves according to the centroid moments to obtain centroid sliding window curves; performing cross-correlation operation on each centroid sliding window curve and a standard peak curve obtained by grouping and comparing the distance pulse width intervals to obtain correlation time, and correcting the correlation time based on the pulse width coefficient of the centroid sliding window curve and the reference pulse width coefficient of the standard peak curve; and obtaining a target distance by combining the reference distance of the standard peak curve, and obtaining a distance measurement result based on a preset output mode. According to the invention, the accuracy of TOF time extraction can be effectively ensured, and the precision and resolution of distance measurement are improved.

A establishing method of a reconfigurable intelligent surface radio frequency model includes calculating a first power ratio between a first receiving antenna and a first transmitting antenna according to a first wireless transmission equation; calculating a second power ratio between a second receiving antenna and a second transmitting antenna according to a second wireless transmission equation, wherein a reconfigurable intelligent surface is disposed between the second transmitting antenna and the second receiving antenna, and separated from the second transmitting antenna by a reference distance; calculating the first power ratio, the second power ratio and a path loss corresponding to the reference distance to obtain a relay gain of the reconfigurable intelligent surface; and establishing the reconfigurable intelligent surface radio frequency model based on a loss correction value and the relay gain.

The invention provides a lifting sling balance control method, which comprises the following steps of: detecting the actual distance from two ends of a traveling cart mechanism to a cart traveling track in real time through a first sensor, comparing the actual distance with a reference distance in real time, and further judging whether the sling is in a horizontal state in real time; as the two ends of the traveling cart mechanism abut against the cart traveling track, a first difference value and a second difference value between the actual distance and the reference distance are calculated respectively, and the first difference value and the second difference value correspond to the difference value between the actual distance between the two ends of the traveling cart mechanism and the cart traveling track and the reference distance respectively. The inclination state of the lifting appliance is judged by judging whether the first difference value and the second difference value are equal or not and judging the sizes of the first difference value and the second difference value, then the offset distance of the lifting appliance is detected through the second sensor, the steel wire rope is wound and unwound through the lifting mechanism till the two ends of the lifting appliance recover the horizontal state, and therefore safety and stability in the lifting appliance operation process are guaranteed.

A system that performs wall direction estimation to determine a position of an acoustically reflective surface relative to a device. For example, the device may detect a direct sound received from an active sound source and a first reflection reflected from a nearby wall. Based on a time delay, the device can estimate a direction and / or distance to the wall. For example, the device determines a time differential of arrival (TDOA) between the direct sound and the first reflection for each microphone in a microphone array. The device combines TDOA values of the entire microphone array into a distance vector, which the device can compare to reference distance data to determine the best wall direction estimate. For example, reference distance values are fixed based on a geometry of the microphone array and the device can identify an azimuth value that is most similar to the distance vector.

A method performed by an electronic device is provided. The method includes receiving, through a distance detection sensor, second signals in which a first signal transmitted through the distance detection sensor is reflected by an external object, identifying a distance from the external object based on at least a part of the second signals, obtaining a deviation information value for the second signals based on identifying that the distance is less than a reference distance, obtaining an image including a visual object corresponding to the external object through a first camera based on the deviation information value being greater than or equal to a reference value, and obtaining the image including the visual object corresponding to the external object through a second camera according to a camera switching, based on the deviation information value being less than the reference value.

The invention relates to the technical field of semiconductors, in particular to a semiconductor wafer measuring method and related equipment. A target layout of a wafer to be measured is divided into a plurality of unit areas, and each unit area comprises an initial addressing point; the initial addressing points are screened through a reference distance interval with the measuring point as the center, at least one reference addressing point is obtained, and each reference addressing point is located in the reference distance interval; determining a target addressing point based on the graph density of the unit area where each reference addressing point is located and the graph density of each unit area adjacent to the reference addressing point; and measuring the wafer to be measured based on the target addressing point and the measurement point. According to the invention, the appropriate target addressing point is efficiently and automatically grabbed, the efficiency and accuracy of wafer data measurement are improved, the labor cost is saved, the measurement period is shortened, the measurement error caused by improper selection of the addressing point is effectively avoided, and the measurement accuracy is improved.

The invention discloses a boiler expansion indication three-dimensional remote transmission measurement method, system and equipment and a medium, and belongs to the technical field of boiler monitoring, and the method comprises the steps: obtaining the real-time distance data of a to-be-measured part of a boiler in a first direction, a second direction and a third direction through a measurement device disposed on the to-be-measured part of the boiler; according to the real-time distance data and preset reference distance data when the boiler does not expand, the expansion amount of the boiler component to be measured in the first direction, the second direction and the third direction is determined; converting the swelling amounts in the first direction, the second direction and the third direction into standard signals; and sending the standard signal to a monitoring system for display. According to the invention, high-precision three-dimensional measurement, automatic data remote transmission and intelligent analysis and early warning based on data are realized, so that the measurement precision and reliability are improved, automatic monitoring and graded early warning are realized, and intelligent diagnosis can be carried out to distinguish real abnormity and measurement interference.

A method of a terminal may comprise: calculating a first adjusted distance threshold by adjusting a first reference distance threshold of a serving cell, based on information on a first reference location of the serving cell, ephemeris information of a satellite, and a location of the terminal; calculating a second adjusted distance threshold by adjusting a second reference distance threshold of a neighbor cell, based on information on a second reference location of the neighbor cell, the ephemeris information, and the location of the terminal; performing a distance-based measurement reporting process by applying the first adjusted distance threshold and the second adjusted distance threshold; and selecting a cell through the distance-based measurement reporting process.

The present disclosure discloses a guided wave radar level meter and a method of operating a guided wave radar level meter. A guided wave radar level gauge (100) for determining a filling level of a product (102) contained in a tank (104) for high pressure applications, comprising: a transceiver (203), a probe (108), a reference reflector (110) and control circuitry (200) configured to: perform a distance measurement to determine a measured distance to the reference reflector; determining a first dielectric constant of the vapor in the canister based on the measured distance to the reference reflector and a reference distance to the reference reflector; acquiring the temperature or pressure of the vapor in the tank; determining a second dielectric constant of the vapor in the tank based on the acquired temperature or pressure; and comparing a difference between the first dielectric constant and the second dielectric constant of the vapor in the canister to a predetermined difference threshold.

A method for rendering an audio source using a plurality of virtual sources is provided. The plurality of virtual sources includes a first virtual source. The method comprises obtaining a target distance gain value that was derived using a target distance gain function for the audio source and a reference distance value indicating a distance between a listening position and a reference point for the audio source. The method further comprises deriving a first distance gain correction value for at least the first virtual source using the target distance gain value. The method further comprises rendering the audio source using the derived first distance gain correction value and a signal for the first virtual source.

A method includes obtaining a current image for a target object, recognizing a target image region from the current image, determining an imaging size of the target object based on the target image region, obtaining a reference parameter determined according to a reference size of the target object and a reference distance between aperture and image sensor of camera, determining first distance between the target object and the camera when the current image is collected based on the reference parameter and the imaging size, obtaining second distance between the target object and the camera when historical image is collected, determining collection time difference between the current and historical images, determining movement speed of the target object based on the first and second distances, and the collection time difference, and determining, according to the current image, target image when the movement speed satisfies identity recognition image condition.

The invention relates to the technical field of mine safety monitoring, in particular to a coal mine tunnel deformation real-time monitoring device and system. The technical problems that in the working process of a traditional roadway monitoring technology in a geological structure complex area, data processing delay is large, and the best intervention opportunity may be missed due to data lag in the traditional technology are solved. According to the technical scheme, the real-time monitoring device and system for deformation of the coal mine tunnel comprise a fixed distance measuring unit, a reflection target array and a displacement calculation unit, the displacement calculation unit is used for obtaining original distance data from each laser distance measuring sensor to a corresponding reflection target in real time, and the original distance data is calculated through difference calculation between the original distance data and a preset reference distance. The real-time displacement variable quantity of each key deformation monitoring position is directly output, and the displacement variable quantity is directly used as a monitoring index of roadway deformation; according to the invention, through the direct correspondence between laser ranging and the reflection target, the scanning and three-dimensional reconstruction process in the traditional technology is abandoned, the single measurement period is shortened, and the real-time capture requirement of catastrophe precursor is met.

The invention relates to the technical field of radar sea surface target detection, in particular to a sea surface small target detection method and system based on neighborhood clutter attention enhancement. The method comprises the following steps: acquiring radar echo data to be detected; performing adaptive whitening preprocessing on the radar echo data to obtain processed data; based on the processed data, performing short-time Fourier transform on the time domain data of the to-be-measured distance unit and the reference distance unit to obtain a time-frequency graph; performing conjugate multiplication operation on the time-frequency graph of the distance unit to be measured and the time-frequency graph of each reference distance unit to obtain conjugate enhanced feature graphs, and combining the conjugate enhanced feature graphs to form a multi-channel time-frequency feature tensor; and inputting the multi-channel time-frequency feature tensor into the constructed ACGAQ Net network model to complete detection. According to the method, the difference characteristics of the target and the clutter in spatial correlation are fully utilized, and reference unit information is supplemented for sea surface target detection.

The invention provides a prefabricated part hoisting precision control method. The prefabricated part hoisting precision control method comprises the following steps that S1, measurement equipment is prepared; s2, measuring equipment installation and reference setting; s3, measuring a reference distance; s4, measuring in-place position parameters; s5, a component parameter measurement angle in the hoisting process is obtained; s6, component deviation calculation and adjustment; according to the invention, the detection part integrating the distance measuring sensor and the tilt angle sensor is used for replacing manual visual detection, so that accurate distance and angle data acquisition of the in-place position of the prefabricated part and the prefabricated part in hoisting is realized, and meanwhile, personnel do not need to approach, so that potential safety hazards are reduced; the actual deviation of the prefabricated part is calculated through the preset reference distance and the distance and angle data measured in real time in combination with an algorithm, manual experience judgment errors are avoided, and the hoisting positioning efficiency is improved.

A method and apparatus for separating transmission channels of a DDMA-MIMO radar, a device, and a storage medium. The method comprises: dividing a Doppler frequency domain into N transmission channels according to the number M of transmitters comprised in a DDMA-MIMO radar (S110); establishing an initial correspondence between the M transmitters and any M transmission channels (S120); determining measured range-Doppler amplitude information and reference range-Doppler amplitude information corresponding to the N transmission channels (S130); determining correlation information between the measured range-Doppler amplitude information and the reference range-Doppler amplitude information (S140); and determining a target correspondence between each transmitter and transmission channel on the basis of the correlation information and the initial correspondence (S150).

The invention relates to an isolating switch closing process state detection method and device and a self-detection isolating switch. According to the method, when a switching-on signal is received, a laser range finder is synchronously controlled to rotate from a first support to a second support, then distance data collected by the laser range finder in the rotation process are obtained, and the switching-on detection result of the disconnecting switch can be determined based on the matching condition between the distance data and corresponding reference distance data. Therefore, according to the disconnecting switch closing process state detection method, the closing condition of the disconnecting switch is observed from the data dimension, and the disconnecting switch closing detection result is determined based on the measured distance data and the corresponding reference distance data, so that automatic disconnecting switch closing process state detection is realized; and the reliability of the closing detection result of the isolating switch is improved.

The present invention relates to a berthing path generation method for a vessel, comprising: a step of obtaining an obstacle map including a plurality of nodes corresponding to positions at sea; a step of selecting a current node corresponding to a current position of the vessel on the obstacle map and a berthing node corresponding to a berthing position; a step of determining a current heading direction of the vessel at the current node and a berthing heading direction at the berthing node; a step of determining a reference distance; a step of determining a plurality of waypoint nodes using the reference distance and a predetermined expected berthing path cost function; and a step of generating the berthing path using the plurality of determined waypoint nodes.

The invention provides a voice coil motor control system and method. The voice coil motor control system comprises a voice coil motor, a laser light source, an interferometer, a square wave circuit and a processing unit. The laser light source is used for transmitting a laser signal to the interferometer; the interferometer is used for generating an interference signal based on the laser signal; the square wave circuit is used for generating n square wave signals based on the interference signal and n voltage thresholds; the processing unit is used for acquiring a moment sequence, and traversing each moment from the (2n + 1) th moment of the moment sequence as a current moment; determining a target duration based on the current moment and a reference moment before the current moment; determining a speed feedback value based on the target duration and the reference distance; and the processing unit is used for determining a speed deviation value based on the speed feedback value and the obtained target speed value, and controlling the movement speed of the voice coil motor based on the speed deviation value. According to the technical scheme, the feedback period of the speed feedback value is short, and the accuracy of motion speed control is improved.

A guided wave radar level gauge for determining a fill level of a product contained in a tank for high-pressure applications including a transceiver, a probe a reference reflector and control circuitry configured to perform a distance measurement to determine a measured distance to the reference reflector; determine a first dielectric constant of a vapor in the tank based on the measured distance to the reference reflector and a reference distance to the reference reflector; acquire a temperature or pressure of the vapor in the tank; determine a second dielectric constant of the vapor in the tank based on the acquired temperature or pressure; and compare a difference between the first and second dielectric constant of the vapor in the tank with a predetermined difference threshold value.

The invention relates to the technical field of ultrasonic radar signal processing, and provides an obstacle risk determination method, system and device based on an ultrasonic radar. The obstacle risk determination method comprises the steps that under the condition that an obstacle is detected, a first reference distance from the obstacle to a first ultrasonic radar is determined, a second reference distance from the obstacle to a second ultrasonic radar is determined, and the first ultrasonic radar and the second ultrasonic radar are arranged in a staggered mode; determining a three-dimensional position parameter of the obstacle relative to the reference position based on the first reference distance, the second reference distance and the position conversion parameter; and performing risk judgment on the obstacle based on the three-dimensional position parameters. According to the technical scheme, the three-dimensional position information of the obstacle can be judged based on the echo signals collected by the two ultrasonic radars arranged in the staggered mode, risk judgment can be conducted on the obstacle based on the three-dimensional position information of the obstacle, and therefore the accuracy of obstacle risk judgment can be improved.

The invention relates to a hole bottom sediment thickness adaptive direction measurement method for irregular hole shapes. The method comprises the following steps: acquiring hole wall images and vertical distance data in multiple directions; image preprocessing is carried out, hole wall feature points are extracted, three-dimensional coordinates are converted, a dynamic three-dimensional model is fitted, deformation grades are divided, and an inclination angle is determined; preferentially distributing detection points in a serious deformation area, calculating an optimal angle, monitoring by a gyroscope, correcting by an electromagnetic damper, adjusting by a servo motor, and ensuring that an included angle between a probe axis and a hole bottom tangent line is compliant; transmitting multi-frequency ultrasonic waves according to deformation grades, analyzing reflected signals through wavelet transformation, extracting sediment layering characteristics, and calculating the distance from a probe to a layering surface through speed correction; the reference distance is calculated based on the reference coordinates, the sediment total thickness and the dense layer thickness are finally obtained, and the measurement method which is adaptive to hole wall deformation, eliminates interference, dynamically adjusts detection parameters and is accurate in reference positioning can meet the high-precision requirement of engineering for sediment thickness and compactness quantification.

The invention relates to a rail train part anomaly detection method based on a point-surface distance, and relates to the technical field of rail part anomaly detection, and the method comprises the steps: a surface recognition step: recognizing an actually measured special surface in a target image through a surface recognition strategy, and generating a corresponding special recognition feature; a model indexing step: calling a target part model from the part type database according to the special identification features and importing the target part model into a space coordinate system; a vector fitting step: determining a presentation vector of the target part model in the space coordinate system through a model presentation strategy, and constructing a coordinate mapping relation between the space coordinate system and the target image; a point confirmation step: determining the graphic plane coordinates of the reference special point in the target image according to the mapping relation; and a deviation calculation step: calculating a difference value between the coordinates of the reference special point and the actually measured special point to obtain a special point deviation, and solving a reference distance deviation through a preset distance solving algorithm. The method has the effect of conveniently detecting the abnormal vector change generated by the rail train parts.

The invention provides a spectrum stabilization method of a nuclear energy spectrum and electronic equipment, and the method comprises the steps: determining a channel address feature value corresponding to each channel address in an energy spectrum diagram; determining a target reference source characteristic peak according to the plurality of channel address characteristic values; determining a reference position with the maximum slope in a falling edge region on the right side of the target reference source characteristic peak; according to a predetermined proportionality coefficient and the reference position, determining a central position of a target reference source characteristic peak; wherein the predetermined proportionality coefficient is the ratio of the reference distance to the full width at half maximum; the reference distance is the distance between the center position of the reference source characteristic peak and the reference position; and based on the central position of the characteristic peak of the target reference source, correcting the energy spectrum diagram to obtain a spectrum-stabilized energy spectrum. According to the technical scheme of the embodiment of the invention, the central position of the characteristic peak of the target reference source can be accurately determined, the influence of statistical fluctuation and the interference of characteristic peaks of other radionuclides are avoided, and the stability of a spectrum stabilization result is ensured.

The present application discloses a data processing method, device, equipment and computer-readable storage medium, and belongs to the field of cloud computing technology. The present application obtains a data processing instruction indicating decompressing target data from first compressed data, the first compressed data is obtained from the data group to which the compressed target data belongs, and the data processing instruction includes the first starting position of the target data in the data group and the length of the target data; based on the first starting position and the reference distance, the second starting position of the second compressed data used for decompressing the target data in the first compressed data is determined, and the reference distance indicates the maximum distance between any data segment in the target data and the data segment it references; the second compressed data is decompressed according to the second starting position and the end position of the second compressed data to obtain the target data, and the end position is determined by the first starting position and the length of the target data. The present application can provide a clear decompression boundary before decompression to improve the decompression accuracy.

The invention discloses a CAN bus light control method for a forklift, and relates to the technical field of forklift lighting control. According to the method, a historical evaluation database is constructed, historical overcurrent faults and overheating faults are used as reference data, an overcurrent evaluation set and an overheating evaluation set of a set time window before the faults occur are analyzed and are used as the reference data, the current value and the temperature value of a mosfet output module are collected in real time, the overcurrent evaluation set and the overheating evaluation set are calculated, and the current value and the temperature value of the mosfet output module are evaluated. A current trend index is compared with historical data, a similarity index ratio is calculated, a similar reference set is screened out, then the similarity degree is further determined by calculating the Euclidean distance, when the Euclidean distance is smaller than a set reference distance value, a corresponding overcurrent or overheating early warning signal is triggered, the most similar reference historical fault can be found, and the fault detection accuracy is improved. A clear direction and detailed reference information are provided for technicians to trace the root of the fault, maintenance and troubleshooting of the forklift are facilitated, and the maintenance cost and the downtime are reduced.

The present invention provides a method and device for detecting anti-expansion of a tubular belt conveyor. The method includes the following steps: determining a detection area and a reference position opposite to the detection area; measuring and recording the distance between the reference position and the surface of the empty belt within the detection area, and denoting it as the reference distance; measuring the distance between the reference position and the surface of the material within the detection area, and denoting it as the measurement distance; calculating the difference between the reference distance and the measurement distance to form a data set; performing an equal-circle transformation on the data set to obtain a transformed circle, and calculating the diameter of the transformed circle, where the area of the transformed circle is equal to the cross-sectional area of the material; determining whether the diameter of the transformed circle exceeds a set threshold and performing corresponding processing. The device includes a mounting bracket, a laser scanning sensor, and a data processing unit. It can effectively identify the material filling condition of the conveying pipe of the tubular belt conveyor, avoid the occurrence of the expansion pipe accident of the tubular belt conveyor, and has the advantages of simple structure, convenient installation, and high reliability.

The invention relates to the technical field of gap measurement, and discloses an elevator component gap measurement system, method and device, the elevator component gap measurement system comprises a data collector and a processor, and acquired analog signals comprise a first reference distance B between the data collector and the tail end of a car door vane, a second reference distance B between the data collector and the tail end of the car door vane; a second reference distance D is arranged between the data collector and the door lock roller; a first distance # imgabs0 # between the data collector and the landing sill; a second distance # imgabs1 # between the data collector and the door lock roller; and obtaining and outputting a detection result based on a preset algorithm. Therefore, the distance between each part in the elevator and the elevator shaft is obtained through various data collected by the elevator part measurement system, such as the first reference distance B, the second reference distance D, the first distance # imgabs2 # and the second distance # imgabs3 #, and the required measurement result can be obtained through calculation based on the basic data obtained through measurement. Therefore, efficient, dynamic and non-contact gap measurement of each part of the elevator is realized.

The application discloses a 4D video generation method fusing monocular vision and terrain elevation data, comprising the following steps: acquiring video frame images and corresponding camera pose data collected by a monocular camera; acquiring terrain elevation data of a target area, and constructing a three-dimensional elevation network model; based on the camera pose data, establishing a ray projection model for pixels in the video frame images, calculating the intersection of the rays and the three-dimensional grid model, and obtaining the reference distance from the monocular camera to the ground surface corresponding to the pixels; generating an initial relative depth map of the video frame images by using a depth estimation model; selecting high-confidence ground pixels from the video frame images as reference points, taking the reference distance corresponding to the reference points as the true value, and performing absolute scale correction on the initial relative depth map to obtain an absolute depth map; performing back projection calculation on the absolute depth map, the camera pose data and pixel color information to generate a three-dimensional point cloud, mapping the three-dimensional point cloud to a real geographic coordinate system, and generating 4D video data in time sequence.

The present application relates to a processing system, a robot system, a control device, a processing method, a control method, a program, and a storage medium. The processing system is configured to set a detector including a plurality of detection elements arranged along a first direction and a second direction intersecting the first direction at a prescribed position. The detector performs an investigation of transmitting an ultrasonic wave to a welded portion of a joint body and detecting a reflected wave. A center position of the welded portion in a first plane along the first direction and the second direction is calculated based on intensity data representing an intensity of the reflected wave obtained by the investigation. A position adjustment is performed so that the detector moves along the first plane so as to reduce a distance between the center position of the welded portion and a position of the detector in the first plane. A reference distance is calculated using a moving distance of the detector in a plurality of past position adjustments. In a case where the reference distance exceeds a first threshold value, the prescribed position is corrected using at least a part of the plurality of moving distances.